Re: [PATCH v3 2/3] drm: zte: add initial vou drm driver

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On Thu, Oct 20, 2016 at 3:30 AM, Shawn Guo <shawn.guo@xxxxxxxxxx> wrote:
> It adds the initial ZTE VOU display controller DRM driver.  There are
> still some features to be added, like overlay plane, scaling, and more
> output devices support.  But it's already useful with dual CRTCs and
> HDMI monitor working.
>
> Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/Kconfig          |   2 +
>  drivers/gpu/drm/Makefile         |   1 +
>  drivers/gpu/drm/zte/Kconfig      |   8 +
>  drivers/gpu/drm/zte/Makefile     |   7 +
>  drivers/gpu/drm/zte/zx_drm_drv.c | 267 +++++++++++++
>  drivers/gpu/drm/zte/zx_drm_drv.h |  36 ++
>  drivers/gpu/drm/zte/zx_hdmi.c    | 678 +++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/zte/zx_plane.c   | 375 ++++++++++++++++++
>  drivers/gpu/drm/zte/zx_plane.h   |  26 ++
>  drivers/gpu/drm/zte/zx_vou.c     | 799 +++++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/zte/zx_vou.h     |  46 +++
>  11 files changed, 2245 insertions(+)
>  create mode 100644 drivers/gpu/drm/zte/Kconfig
>  create mode 100644 drivers/gpu/drm/zte/Makefile
>  create mode 100644 drivers/gpu/drm/zte/zx_drm_drv.c
>  create mode 100644 drivers/gpu/drm/zte/zx_drm_drv.h
>  create mode 100644 drivers/gpu/drm/zte/zx_hdmi.c
>  create mode 100644 drivers/gpu/drm/zte/zx_plane.c
>  create mode 100644 drivers/gpu/drm/zte/zx_plane.h
>  create mode 100644 drivers/gpu/drm/zte/zx_vou.c
>  create mode 100644 drivers/gpu/drm/zte/zx_vou.h
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index 483059a22b1b..a91f8cecbe0f 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -223,6 +223,8 @@ source "drivers/gpu/drm/hisilicon/Kconfig"
>
>  source "drivers/gpu/drm/mediatek/Kconfig"
>
> +source "drivers/gpu/drm/zte/Kconfig"
> +
>  # Keep legacy drivers last
>
>  menuconfig DRM_LEGACY
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index 25c720454017..f3251750c92b 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -86,3 +86,4 @@ obj-$(CONFIG_DRM_FSL_DCU) += fsl-dcu/
>  obj-$(CONFIG_DRM_ETNAVIV) += etnaviv/
>  obj-$(CONFIG_DRM_ARCPGU)+= arc/
>  obj-y                  += hisilicon/
> +obj-$(CONFIG_DRM_ZTE)  += zte/
> diff --git a/drivers/gpu/drm/zte/Kconfig b/drivers/gpu/drm/zte/Kconfig
> new file mode 100644
> index 000000000000..4065b2840f1c
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/Kconfig
> @@ -0,0 +1,8 @@
> +config DRM_ZTE
> +       tristate "DRM Support for ZTE SoCs"
> +       depends on DRM && ARCH_ZX
> +       select DRM_KMS_CMA_HELPER
> +       select DRM_KMS_FB_HELPER
> +       select DRM_KMS_HELPER
> +       help
> +         Choose this option to enable DRM on ZTE ZX SoCs.
> diff --git a/drivers/gpu/drm/zte/Makefile b/drivers/gpu/drm/zte/Makefile
> new file mode 100644
> index 000000000000..699180bfd57c
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/Makefile
> @@ -0,0 +1,7 @@
> +zxdrm-y := \
> +       zx_drm_drv.o \
> +       zx_hdmi.o \
> +       zx_plane.o \
> +       zx_vou.o
> +
> +obj-$(CONFIG_DRM_ZTE) += zxdrm.o
> diff --git a/drivers/gpu/drm/zte/zx_drm_drv.c b/drivers/gpu/drm/zte/zx_drm_drv.c
> new file mode 100644
> index 000000000000..2476a9b92cea
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_drm_drv.c
> @@ -0,0 +1,267 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/component.h>
> +#include <linux/list.h>
> +#include <linux/module.h>
> +#include <linux/of_graph.h>
> +#include <linux/of_platform.h>
> +#include <linux/spinlock.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_of.h>
> +#include <drm/drmP.h>
> +
> +#include "zx_drm_drv.h"
> +#include "zx_vou.h"
> +
> +struct zx_drm_private {
> +       struct drm_fbdev_cma *fbdev;
> +};
> +
> +static void zx_drm_fb_output_poll_changed(struct drm_device *drm)
> +{
> +       struct zx_drm_private *priv = drm->dev_private;
> +
> +       drm_fbdev_cma_hotplug_event(priv->fbdev);
> +}
> +
> +static const struct drm_mode_config_funcs zx_drm_mode_config_funcs = {
> +       .fb_create = drm_fb_cma_create,
> +       .output_poll_changed = zx_drm_fb_output_poll_changed,
> +       .atomic_check = drm_atomic_helper_check,
> +       .atomic_commit = drm_atomic_helper_commit,
> +};
> +
> +static void zx_drm_lastclose(struct drm_device *drm)
> +{
> +       struct zx_drm_private *priv = drm->dev_private;
> +
> +       drm_fbdev_cma_restore_mode(priv->fbdev);
> +}
> +
> +static const struct file_operations zx_drm_fops = {
> +       .owner = THIS_MODULE,
> +       .open = drm_open,
> +       .release = drm_release,
> +       .unlocked_ioctl = drm_ioctl,
> +#ifdef CONFIG_COMPAT
> +       .compat_ioctl = drm_compat_ioctl,
> +#endif
> +       .poll = drm_poll,
> +       .read = drm_read,
> +       .llseek = noop_llseek,
> +       .mmap = drm_gem_cma_mmap,
> +};
> +
> +static struct drm_driver zx_drm_driver = {
> +       .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
> +                          DRIVER_ATOMIC,
> +       .lastclose = zx_drm_lastclose,
> +       .get_vblank_counter = drm_vblank_no_hw_counter,
> +       .enable_vblank = zx_vou_enable_vblank,
> +       .disable_vblank = zx_vou_disable_vblank,
> +       .gem_free_object = drm_gem_cma_free_object,
> +       .gem_vm_ops = &drm_gem_cma_vm_ops,
> +       .dumb_create = drm_gem_cma_dumb_create,
> +       .dumb_map_offset = drm_gem_cma_dumb_map_offset,
> +       .dumb_destroy = drm_gem_dumb_destroy,
> +       .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
> +       .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> +       .gem_prime_export = drm_gem_prime_export,
> +       .gem_prime_import = drm_gem_prime_import,
> +       .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
> +       .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
> +       .gem_prime_vmap = drm_gem_cma_prime_vmap,
> +       .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
> +       .gem_prime_mmap = drm_gem_cma_prime_mmap,
> +       .fops = &zx_drm_fops,
> +       .name = "zx-vou",
> +       .desc = "ZTE VOU Controller DRM",
> +       .date = "20160811",
> +       .major = 1,
> +       .minor = 0,
> +};
> +
> +static int zx_drm_bind(struct device *dev)
> +{
> +       struct drm_device *drm;
> +       struct zx_drm_private *priv;
> +       int ret;
> +
> +       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +       if (!priv)
> +               return -ENOMEM;
> +
> +       drm = drm_dev_alloc(&zx_drm_driver, dev);
> +       if (!drm)
> +               return -ENOMEM;
> +
> +       drm->dev_private = priv;
> +       dev_set_drvdata(dev, drm);
> +
> +       drm_mode_config_init(drm);
> +       drm->mode_config.min_width = 16;
> +       drm->mode_config.min_height = 16;
> +       drm->mode_config.max_width = 4096;
> +       drm->mode_config.max_height = 4096;
> +       drm->mode_config.funcs = &zx_drm_mode_config_funcs;
> +
> +       ret = component_bind_all(dev, drm);
> +       if (ret) {
> +               dev_err(dev, "failed to bind all components: %d\n", ret);

Consider using the new DRM_DEV_* messages instead of the plain old dev_*

> +               goto out_unregister;
> +       }
> +
> +       ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
> +       if (ret < 0) {
> +               dev_err(dev, "failed to init vblank: %d\n", ret);
> +               goto out_unbind;
> +       }
> +
> +       /*
> +        * We will manage irq handler on our own.  In this case, irq_enabled
> +        * need to be true for using vblank core support.
> +        */
> +       drm->irq_enabled = true;
> +
> +       drm_mode_config_reset(drm);
> +       drm_kms_helper_poll_init(drm);
> +
> +       priv->fbdev = drm_fbdev_cma_init(drm, 32, drm->mode_config.num_crtc,
> +                                        drm->mode_config.num_connector);
> +       if (IS_ERR(priv->fbdev)) {
> +               ret = PTR_ERR(priv->fbdev);
> +               dev_err(dev, "failed to init cma fbdev: %d\n", ret);
> +               priv->fbdev = NULL;
> +               goto out_poll_fini;
> +       }
> +
> +       ret = drm_dev_register(drm, 0);
> +       if (ret)
> +               goto out_fbdev_fini;
> +
> +       return 0;
> +
> +out_fbdev_fini:
> +       if (priv->fbdev) {
> +               drm_fbdev_cma_fini(priv->fbdev);
> +               priv->fbdev = NULL;
> +       }
> +out_poll_fini:
> +       drm_kms_helper_poll_fini(drm);
> +       drm_mode_config_cleanup(drm);
> +       drm_vblank_cleanup(drm);
> +out_unbind:
> +       component_unbind_all(dev, drm);
> +out_unregister:
> +       dev_set_drvdata(dev, NULL);
> +       drm->dev_private = NULL;
> +       drm_dev_unref(drm);
> +       return ret;
> +}
> +
> +static void zx_drm_unbind(struct device *dev)
> +{
> +       struct drm_device *drm = dev_get_drvdata(dev);
> +       struct zx_drm_private *priv = drm->dev_private;
> +
> +       drm_dev_unregister(drm);
> +       if (priv->fbdev) {
> +               drm_fbdev_cma_fini(priv->fbdev);
> +               priv->fbdev = NULL;
> +       }
> +       drm_kms_helper_poll_fini(drm);
> +       drm_mode_config_cleanup(drm);
> +       drm_vblank_cleanup(drm);
> +       component_unbind_all(dev, drm);
> +       dev_set_drvdata(dev, NULL);
> +       drm->dev_private = NULL;
> +       drm_dev_unref(drm);
> +}
> +
> +static const struct component_master_ops zx_drm_master_ops = {
> +       .bind = zx_drm_bind,
> +       .unbind = zx_drm_unbind,
> +};
> +
> +static int compare_of(struct device *dev, void *data)
> +{
> +       return dev->of_node == data;
> +}
> +
> +static int zx_drm_probe(struct platform_device *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct device_node *parent = dev->of_node;
> +       struct device_node *child;
> +       struct component_match *match = NULL;
> +       int ret;
> +
> +       ret = of_platform_populate(parent, NULL, NULL, dev);
> +       if (ret)
> +               return ret;
> +
> +       for_each_available_child_of_node(parent, child) {
> +               component_match_add(dev, &match, compare_of, child);
> +               of_node_put(child);
> +       }
> +
> +       return component_master_add_with_match(dev, &zx_drm_master_ops, match);
> +}
> +
> +static int zx_drm_remove(struct platform_device *pdev)
> +{
> +       component_master_del(&pdev->dev, &zx_drm_master_ops);
> +       return 0;
> +}
> +
> +static const struct of_device_id zx_drm_of_match[] = {
> +       { .compatible = "zte,zx296718-vou", },
> +       { /* end */ },
> +};
> +MODULE_DEVICE_TABLE(of, zx_drm_of_match);
> +
> +static struct platform_driver zx_drm_platform_driver = {
> +       .probe = zx_drm_probe,
> +       .remove = zx_drm_remove,
> +       .driver = {
> +               .name = "zx-drm",
> +               .of_match_table = zx_drm_of_match,
> +       },
> +};
> +
> +static struct platform_driver *drivers[] = {
> +       &zx_crtc_driver,
> +       &zx_hdmi_driver,
> +       &zx_drm_platform_driver,
> +};
> +
> +static int zx_drm_init(void)
> +{
> +       return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
> +}
> +module_init(zx_drm_init);
> +
> +static void zx_drm_exit(void)
> +{
> +       platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
> +}
> +module_exit(zx_drm_exit);
> +
> +MODULE_AUTHOR("Shawn Guo <shawn.guo@xxxxxxxxxx>");
> +MODULE_DESCRIPTION("ZTE ZX VOU DRM driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/zte/zx_drm_drv.h b/drivers/gpu/drm/zte/zx_drm_drv.h
> new file mode 100644
> index 000000000000..e65cd18a6cba
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_drm_drv.h
> @@ -0,0 +1,36 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#ifndef __ZX_DRM_DRV_H__
> +#define __ZX_DRM_DRV_H__
> +
> +extern struct platform_driver zx_crtc_driver;
> +extern struct platform_driver zx_hdmi_driver;
> +
> +static inline u32 zx_readl(void __iomem *reg)
> +{
> +       return readl_relaxed(reg);
> +}
> +
> +static inline void zx_writel(void __iomem *reg, u32 val)
> +{
> +       writel_relaxed(val, reg);
> +}
> +
> +static inline void zx_writel_mask(void __iomem *reg, u32 mask, u32 val)
> +{
> +       u32 tmp;
> +
> +       tmp = zx_readl(reg);
> +       tmp = (tmp & ~mask) | (val & mask);
> +       zx_writel(reg, tmp);
> +}
> +
> +#endif /* __ZX_DRM_DRV_H__ */
> diff --git a/drivers/gpu/drm/zte/zx_hdmi.c b/drivers/gpu/drm/zte/zx_hdmi.c
> new file mode 100644
> index 000000000000..81e1c3716ed8
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_hdmi.c
> @@ -0,0 +1,678 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/component.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/hdmi.h>
> +#include <linux/irq.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_device.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_edid.h>
> +#include <drm/drm_of.h>
> +#include <drm/drmP.h>
> +
> +#include "zx_vou.h"
> +
> +#define FUNC_SEL                       0x000b
> +#define FUNC_HDMI_EN                   BIT(0)
> +#define CLKPWD                         0x000d
> +#define CLKPWD_PDIDCK                  BIT(2)
> +#define PWD_SRST                       0x0010
> +#define P2T_CTRL                       0x0066
> +#define P2T_DC_PKT_EN                  BIT(7)
> +#define L1_INTR_STAT                   0x007e
> +#define L1_INTR_STAT_INTR1             BIT(0)
> +#define INTR1_STAT                     0x008f
> +#define INTR1_MASK                     0x0095
> +#define INTR1_MONITOR_DETECT           (BIT(5) | BIT(6))
> +#define ZX_DDC_ADDR                    0x00ed
> +#define ZX_DDC_SEGM                    0x00ee
> +#define ZX_DDC_OFFSET                  0x00ef
> +#define ZX_DDC_DIN_CNT1                        0x00f0
> +#define ZX_DDC_DIN_CNT2                        0x00f1
> +#define ZX_DDC_CMD                     0x00f3
> +#define DDC_CMD_MASK                   0xf
> +#define DDC_CMD_CLEAR_FIFO             0x9
> +#define DDC_CMD_SEQUENTIAL_READ                0x2
> +#define ZX_DDC_DATA                    0x00f4
> +#define ZX_DDC_DOUT_CNT                        0x00f5
> +#define DDC_DOUT_CNT_MASK              0x1f
> +#define TEST_TXCTRL                    0x00f7
> +#define TEST_TXCTRL_HDMI_MODE          BIT(1)
> +#define HDMICTL4                       0x0235
> +#define TPI_HPD_RSEN                   0x063b
> +#define TPI_HPD_CONNECTION             (BIT(1) | BIT(2))
> +#define TPI_INFO_FSEL                  0x06bf
> +#define FSEL_AVI                       0
> +#define FSEL_GBD                       1
> +#define FSEL_AUDIO                     2
> +#define FSEL_SPD                       3
> +#define FSEL_MPEG                      4
> +#define FSEL_VSIF                      5
> +#define TPI_INFO_B0                    0x06c0
> +#define TPI_INFO_EN                    0x06df
> +#define TPI_INFO_TRANS_EN              BIT(7)
> +#define TPI_INFO_TRANS_RPT             BIT(6)
> +#define TPI_DDC_MASTER_EN              0x06f8
> +#define HW_DDC_MASTER                  BIT(7)
> +
> +#define ZX_HDMI_INFOFRAME_SIZE         31
> +
> +#define DDC_SEGMENT_ADDR               0x30
> +
> +struct zx_hdmi_i2c {
> +       struct i2c_adapter adap;
> +       struct mutex lock;
> +};
> +
> +struct zx_hdmi {
> +       struct drm_connector connector;
> +       struct drm_encoder encoder;
> +       struct zx_hdmi_i2c *ddc;
> +       struct device *dev;
> +       struct drm_device *drm;
> +       void __iomem *mmio;
> +       struct clk *cec_clk;
> +       struct clk *osc_clk;
> +       struct clk *xclk;
> +       bool sink_is_hdmi;
> +       bool sink_has_audio;
> +       const struct vou_inf *inf;
> +};
> +
> +#define to_zx_hdmi(x) container_of(x, struct zx_hdmi, x)
> +
> +static const struct vou_inf vou_inf_hdmi = {
> +       .id = VOU_HDMI,
> +       .data_sel = VOU_YUV444,
> +       .clocks_en_bits = BIT(24) | BIT(18) | BIT(6),
> +       .clocks_sel_bits = BIT(13) | BIT(2),
> +};
> +
> +static inline u8 hdmi_readb(struct zx_hdmi *hdmi, u16 offset)
> +{
> +       return readl_relaxed(hdmi->mmio + offset * 4);
> +}
> +
> +static inline void hdmi_writeb(struct zx_hdmi *hdmi, u16 offset, u8 val)
> +{
> +       writel_relaxed(val, hdmi->mmio + offset * 4);
> +}
> +
> +static inline void hdmi_writeb_mask(struct zx_hdmi *hdmi, u16 offset,
> +                                   u8 mask, u8 val)
> +{
> +       u8 tmp;
> +
> +       tmp = hdmi_readb(hdmi, offset);
> +       tmp = (tmp & ~mask) | (val & mask);
> +       hdmi_writeb(hdmi, offset, tmp);
> +}
> +
> +static int zx_hdmi_infoframe_trans(struct zx_hdmi *hdmi,
> +                                  union hdmi_infoframe *frame, u8 fsel)
> +{
> +       u8 buffer[ZX_HDMI_INFOFRAME_SIZE];
> +       int num;
> +       int i;
> +
> +       hdmi_writeb(hdmi, TPI_INFO_FSEL, fsel);
> +
> +       num = hdmi_infoframe_pack(frame, buffer, ZX_HDMI_INFOFRAME_SIZE);
> +       if (num < 0) {
> +               dev_err(hdmi->dev, "failed to pack infoframe: %d\n", num);
> +               return num;
> +       }
> +
> +       for (i = 0; i < num; i++)
> +               hdmi_writeb(hdmi, TPI_INFO_B0 + i, buffer[i]);
> +
> +       hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_RPT,
> +                        TPI_INFO_TRANS_RPT);
> +       hdmi_writeb_mask(hdmi, TPI_INFO_EN, TPI_INFO_TRANS_EN,
> +                        TPI_INFO_TRANS_EN);
> +
> +       return num;
> +}
> +
> +static int zx_hdmi_config_video_vsi(struct zx_hdmi *hdmi,
> +                                   struct drm_display_mode *mode)
> +{
> +       union hdmi_infoframe frame;
> +       int ret;
> +
> +       ret = drm_hdmi_vendor_infoframe_from_display_mode(&frame.vendor.hdmi,
> +                                                         mode);
> +       if (ret) {
> +               dev_err(hdmi->dev, "failed to get vendor infoframe: %d\n", ret);
> +               return ret;
> +       }
> +
> +       return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_VSIF);
> +}
> +
> +static int zx_hdmi_config_video_avi(struct zx_hdmi *hdmi,
> +                                   struct drm_display_mode *mode)
> +{
> +       union hdmi_infoframe frame;
> +       int ret;
> +
> +       ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi, mode);
> +       if (ret) {
> +               dev_err(hdmi->dev, "failed to get avi infoframe: %d\n", ret);
> +               return ret;
> +       }
> +
> +       /* We always use YUV444 for HDMI output. */
> +       frame.avi.colorspace = HDMI_COLORSPACE_YUV444;
> +
> +       return zx_hdmi_infoframe_trans(hdmi, &frame, FSEL_AVI);
> +}
> +
> +static void zx_hdmi_encoder_mode_set(struct drm_encoder *encoder,
> +                                    struct drm_display_mode *mode,
> +                                    struct drm_display_mode *adj_mode)
> +{
> +       struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
> +
> +       if (hdmi->sink_is_hdmi) {
> +               zx_hdmi_config_video_avi(hdmi, mode);
> +               zx_hdmi_config_video_vsi(hdmi, mode);
> +       }
> +}
> +
> +static void zx_hdmi_encoder_enable(struct drm_encoder *encoder)
> +{
> +       struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
> +
> +       vou_inf_enable(hdmi->inf, encoder->crtc);
> +}
> +
> +static void zx_hdmi_encoder_disable(struct drm_encoder *encoder)
> +{
> +       struct zx_hdmi *hdmi = to_zx_hdmi(encoder);
> +
> +       vou_inf_disable(hdmi->inf, encoder->crtc);
> +}
> +
> +static const struct drm_encoder_helper_funcs zx_hdmi_encoder_helper_funcs = {
> +       .enable = zx_hdmi_encoder_enable,
> +       .disable = zx_hdmi_encoder_disable,
> +       .mode_set = zx_hdmi_encoder_mode_set,
> +};
> +
> +static const struct drm_encoder_funcs zx_hdmi_encoder_funcs = {
> +       .destroy = drm_encoder_cleanup,
> +};
> +
> +static int zx_hdmi_connector_get_modes(struct drm_connector *connector)
> +{
> +       struct zx_hdmi *hdmi = to_zx_hdmi(connector);
> +       struct edid *edid;
> +       int ret;
> +
> +       edid = drm_get_edid(connector, &hdmi->ddc->adap);
> +       if (!edid)
> +               return 0;
> +
> +       hdmi->sink_is_hdmi = drm_detect_hdmi_monitor(edid);
> +       hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
> +       drm_mode_connector_update_edid_property(connector, edid);
> +       ret = drm_add_edid_modes(connector, edid);
> +       kfree(edid);
> +
> +       return ret;
> +}
> +
> +static enum drm_mode_status
> +zx_hdmi_connector_mode_valid(struct drm_connector *connector,
> +                            struct drm_display_mode *mode)
> +{
> +       return MODE_OK;
> +}
> +
> +static struct drm_connector_helper_funcs zx_hdmi_connector_helper_funcs = {
> +       .get_modes = zx_hdmi_connector_get_modes,
> +       .mode_valid = zx_hdmi_connector_mode_valid,
> +};
> +
> +static enum drm_connector_status
> +zx_hdmi_connector_detect(struct drm_connector *connector, bool force)
> +{
> +       struct zx_hdmi *hdmi = to_zx_hdmi(connector);
> +
> +       return (hdmi_readb(hdmi, TPI_HPD_RSEN) & TPI_HPD_CONNECTION) ?
> +               connector_status_connected : connector_status_disconnected;
> +}
> +
> +static void zx_hdmi_connector_destroy(struct drm_connector *connector)
> +{
> +       drm_connector_unregister(connector);
> +       drm_connector_cleanup(connector);
> +}
> +
> +static const struct drm_connector_funcs zx_hdmi_connector_funcs = {
> +       .dpms = drm_atomic_helper_connector_dpms,
> +       .fill_modes = drm_helper_probe_single_connector_modes,
> +       .detect = zx_hdmi_connector_detect,
> +       .destroy = zx_hdmi_connector_destroy,
> +       .reset = drm_atomic_helper_connector_reset,
> +       .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> +       .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static int zx_hdmi_register(struct drm_device *drm, struct zx_hdmi *hdmi)
> +{
> +       struct drm_encoder *encoder = &hdmi->encoder;
> +
> +       encoder->possible_crtcs = VOU_CRTC_MASK;
> +
> +       drm_encoder_init(drm, encoder, &zx_hdmi_encoder_funcs,
> +                        DRM_MODE_ENCODER_TMDS, NULL);
> +       drm_encoder_helper_add(encoder, &zx_hdmi_encoder_helper_funcs);
> +
> +       hdmi->connector.polled = DRM_CONNECTOR_POLL_HPD;
> +
> +       drm_connector_init(drm, &hdmi->connector, &zx_hdmi_connector_funcs,
> +                          DRM_MODE_CONNECTOR_HDMIA);
> +       drm_connector_helper_add(&hdmi->connector,
> +                                &zx_hdmi_connector_helper_funcs);
> +
> +       drm_mode_connector_attach_encoder(&hdmi->connector, encoder);
> +
> +       return 0;
> +}
> +
> +static irqreturn_t zx_hdmi_irq_thread(int irq, void *dev_id)
> +{
> +       struct zx_hdmi *hdmi = dev_id;
> +
> +       drm_helper_hpd_irq_event(hdmi->connector.dev);
> +
> +       return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t zx_hdmi_irq_handler(int irq, void *dev_id)
> +{
> +       struct zx_hdmi *hdmi = dev_id;
> +       u8 lstat;
> +
> +       lstat = hdmi_readb(hdmi, L1_INTR_STAT);
> +
> +       /* Monitor detect/HPD interrupt */
> +       if (lstat & L1_INTR_STAT_INTR1) {
> +               u8 stat;
> +
> +               stat = hdmi_readb(hdmi, INTR1_STAT);
> +               hdmi_writeb(hdmi, INTR1_STAT, stat);
> +
> +               if (stat & INTR1_MONITOR_DETECT)
> +                       return IRQ_WAKE_THREAD;
> +       }
> +
> +       return IRQ_NONE;
> +}
> +
> +static int zx_hdmi_i2c_read(struct zx_hdmi *hdmi, struct i2c_msg *msg)
> +{
> +       int len = msg->len;
> +       u8 *buf = msg->buf;
> +       int retry = 0;
> +       int ret = 0;
> +
> +       /* Bits [9:8] of bytes */
> +       hdmi_writeb(hdmi, ZX_DDC_DIN_CNT2, (len >> 8) & 0xff);
> +       /* Bits [7:0] of bytes */
> +       hdmi_writeb(hdmi, ZX_DDC_DIN_CNT1, len & 0xff);
> +
> +       /* Clear FIFO */
> +       hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK, DDC_CMD_CLEAR_FIFO);
> +
> +       /* Kick off the read */
> +       hdmi_writeb_mask(hdmi, ZX_DDC_CMD, DDC_CMD_MASK,
> +                        DDC_CMD_SEQUENTIAL_READ);
> +
> +       while (len > 0) {
> +               int cnt, i;
> +
> +               /* FIFO needs some time to get ready */
> +               usleep_range(500, 1000);
> +
> +               cnt = hdmi_readb(hdmi, ZX_DDC_DOUT_CNT) & DDC_DOUT_CNT_MASK;
> +               if (cnt == 0) {
> +                       if (++retry > 5) {
> +                               dev_err(hdmi->dev, "DDC FIFO read timed out!");
> +                               ret = -ETIMEDOUT;
> +                               break;

Why not just return -ETIMEDOUT here?


> +                       }
> +                       continue;
> +               }
> +
> +               for (i = 0; i < cnt; i++)
> +                       *buf++ = hdmi_readb(hdmi, ZX_DDC_DATA);
> +               len -= cnt;
> +       }
> +
> +       return ret;
> +}
> +
> +static int zx_hdmi_i2c_write(struct zx_hdmi *hdmi, struct i2c_msg *msg)
> +{
> +       /*
> +        * The DDC I2C adapter is only for reading EDID data, so we assume
> +        * that the write to this adapter must be the EDID data offset.
> +        */
> +       if ((msg->len != 1) ||
> +           ((msg->addr != DDC_ADDR) && (msg->addr != DDC_SEGMENT_ADDR)))
> +               return -EINVAL;
> +
> +       if (msg->addr == DDC_SEGMENT_ADDR)
> +               hdmi_writeb(hdmi, ZX_DDC_SEGM, msg->addr << 1);
> +       else if (msg->addr == DDC_ADDR)
> +               hdmi_writeb(hdmi, ZX_DDC_ADDR, msg->addr << 1);
> +
> +       hdmi_writeb(hdmi, ZX_DDC_OFFSET, msg->buf[0]);
> +
> +       return 0;
> +}
> +
> +static int zx_hdmi_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
> +                           int num)
> +{
> +       struct zx_hdmi *hdmi = i2c_get_adapdata(adap);
> +       struct zx_hdmi_i2c *ddc = hdmi->ddc;
> +       int i, ret = 0;
> +
> +       mutex_lock(&ddc->lock);
> +
> +       /* Enable DDC master access */
> +       hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, HW_DDC_MASTER);
> +
> +       for (i = 0; i < num; i++) {
> +               dev_dbg(hdmi->dev, "xfer: num: %d/%d, len: %d, flags: %#x\n",
> +                       i + 1, num, msgs[i].len, msgs[i].flags);
> +
> +               if (msgs[i].flags & I2C_M_RD)
> +                       ret = zx_hdmi_i2c_read(hdmi, &msgs[i]);
> +               else
> +                       ret = zx_hdmi_i2c_write(hdmi, &msgs[i]);
> +
> +               if (ret < 0)
> +                       break;
> +       }
> +
> +       if (!ret)
> +               ret = num;
> +
> +       /* Disable DDC master access */
> +       hdmi_writeb_mask(hdmi, TPI_DDC_MASTER_EN, HW_DDC_MASTER, 0);
> +
> +       mutex_unlock(&ddc->lock);
> +
> +       return ret;
> +}
> +
> +static u32 zx_hdmi_i2c_func(struct i2c_adapter *adapter)
> +{
> +       return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static const struct i2c_algorithm zx_hdmi_algorithm = {
> +       .master_xfer    = zx_hdmi_i2c_xfer,
> +       .functionality  = zx_hdmi_i2c_func,
> +};
> +
> +static int zx_hdmi_ddc_register(struct zx_hdmi *hdmi)
> +{
> +       struct i2c_adapter *adap;
> +       struct zx_hdmi_i2c *ddc;
> +       int ret;
> +
> +       ddc = devm_kzalloc(hdmi->dev, sizeof(*ddc), GFP_KERNEL);
> +       if (!ddc)
> +               return -ENOMEM;
> +
> +       hdmi->ddc = ddc;
> +       mutex_init(&ddc->lock);
> +
> +       adap = &ddc->adap;
> +       adap->owner = THIS_MODULE;
> +       adap->class = I2C_CLASS_DDC;
> +       adap->dev.parent = hdmi->dev;
> +       adap->algo = &zx_hdmi_algorithm;
> +       snprintf(adap->name, sizeof(adap->name), "zx hdmi i2c");
> +
> +       ret = i2c_add_adapter(adap);
> +       if (ret) {
> +               dev_err(hdmi->dev, "failed to add I2C adapter: %d\n", ret);
> +               return ret;
> +       }
> +
> +       i2c_set_adapdata(adap, hdmi);
> +
> +       return 0;
> +}
> +
> +static void zx_hdmi_phy_start(struct zx_hdmi *hdmi)
> +{
> +       /* Copy from ZTE BSP code */
> +       hdmi_writeb(hdmi, 0x222, 0x0);
> +       hdmi_writeb(hdmi, 0x224, 0x4);
> +       hdmi_writeb(hdmi, 0x909, 0x0);
> +       hdmi_writeb(hdmi, 0x7b0, 0x90);
> +       hdmi_writeb(hdmi, 0x7b1, 0x00);
> +       hdmi_writeb(hdmi, 0x7b2, 0xa7);
> +       hdmi_writeb(hdmi, 0x7b8, 0xaa);
> +       hdmi_writeb(hdmi, 0x7b2, 0xa7);
> +       hdmi_writeb(hdmi, 0x7b3, 0x0f);
> +       hdmi_writeb(hdmi, 0x7b4, 0x0f);
> +       hdmi_writeb(hdmi, 0x7b5, 0x55);
> +       hdmi_writeb(hdmi, 0x7b7, 0x03);
> +       hdmi_writeb(hdmi, 0x7b9, 0x12);
> +       hdmi_writeb(hdmi, 0x7ba, 0x32);
> +       hdmi_writeb(hdmi, 0x7bc, 0x68);
> +       hdmi_writeb(hdmi, 0x7be, 0x40);
> +       hdmi_writeb(hdmi, 0x7bf, 0x84);
> +       hdmi_writeb(hdmi, 0x7c1, 0x0f);
> +       hdmi_writeb(hdmi, 0x7c8, 0x02);
> +       hdmi_writeb(hdmi, 0x7c9, 0x03);
> +       hdmi_writeb(hdmi, 0x7ca, 0x40);
> +       hdmi_writeb(hdmi, 0x7dc, 0x31);
> +       hdmi_writeb(hdmi, 0x7e2, 0x04);
> +       hdmi_writeb(hdmi, 0x7e0, 0x06);
> +       hdmi_writeb(hdmi, 0x7cb, 0x68);
> +       hdmi_writeb(hdmi, 0x7f9, 0x02);
> +       hdmi_writeb(hdmi, 0x7b6, 0x02);
> +       hdmi_writeb(hdmi, 0x7f3, 0x0);
> +}
> +
> +static void zx_hdmi_hw_init(struct zx_hdmi *hdmi)
> +{
> +       /* Software reset */
> +       hdmi_writeb(hdmi, PWD_SRST, 1);
> +
> +       /* Enable pclk */
> +       hdmi_writeb_mask(hdmi, CLKPWD, CLKPWD_PDIDCK, CLKPWD_PDIDCK);
> +
> +       /* Enable HDMI for TX */
> +       hdmi_writeb_mask(hdmi, FUNC_SEL, FUNC_HDMI_EN, FUNC_HDMI_EN);
> +
> +       /* Enable deep color packet */
> +       hdmi_writeb_mask(hdmi, P2T_CTRL, P2T_DC_PKT_EN, P2T_DC_PKT_EN);
> +
> +       /* Enable HDMI/MHL mode for output */
> +       hdmi_writeb_mask(hdmi, TEST_TXCTRL, TEST_TXCTRL_HDMI_MODE,
> +                        TEST_TXCTRL_HDMI_MODE);
> +
> +       /* Configure reg_qc_sel */
> +       hdmi_writeb(hdmi, HDMICTL4, 0x3);
> +
> +       /* Enable interrupt */
> +       hdmi_writeb_mask(hdmi, INTR1_MASK, INTR1_MONITOR_DETECT,
> +                        INTR1_MONITOR_DETECT);
> +
> +       /* Clear reset for normal operation */
> +       hdmi_writeb(hdmi, PWD_SRST, 0);
> +
> +       /* Start up phy */
> +       zx_hdmi_phy_start(hdmi);
> +}
> +
> +static int zx_hdmi_bind(struct device *dev, struct device *master, void *data)
> +{
> +       struct platform_device *pdev = to_platform_device(dev);
> +       struct drm_device *drm = data;
> +       struct resource *res;
> +       struct zx_hdmi *hdmi;
> +       int irq;
> +       int ret;
> +
> +       hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
> +       if (!hdmi)
> +               return -ENOMEM;
> +
> +       hdmi->dev = dev;
> +       hdmi->drm = drm;
> +       hdmi->inf = &vou_inf_hdmi;
> +
> +       dev_set_drvdata(dev, hdmi);
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       hdmi->mmio = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(hdmi->mmio)) {
> +               ret = PTR_ERR(hdmi->mmio);
> +               dev_err(dev, "failed to remap hdmi region: %d\n", ret);
> +               return ret;
> +       }
> +
> +       irq = platform_get_irq(pdev, 0);
> +       if (irq < 0)
> +               return irq;
> +
> +       hdmi->cec_clk = devm_clk_get(hdmi->dev, "osc_cec");
> +       if (IS_ERR(hdmi->cec_clk)) {
> +               ret = PTR_ERR(hdmi->cec_clk);
> +               dev_err(dev, "failed to get cec_clk: %d\n", ret);
> +               return ret;
> +       }
> +
> +       hdmi->osc_clk = devm_clk_get(hdmi->dev, "osc_clk");
> +       if (IS_ERR(hdmi->osc_clk)) {
> +               ret = PTR_ERR(hdmi->osc_clk);
> +               dev_err(dev, "failed to get osc_clk: %d\n", ret);
> +               return ret;
> +       }
> +
> +       hdmi->xclk = devm_clk_get(hdmi->dev, "xclk");
> +       if (IS_ERR(hdmi->xclk)) {
> +               ret = PTR_ERR(hdmi->xclk);
> +               dev_err(dev, "failed to get xclk: %d\n", ret);
> +               return ret;
> +       }
> +
> +       zx_hdmi_hw_init(hdmi);
> +
> +       ret = clk_prepare_enable(hdmi->cec_clk);
> +       if (ret) {
> +               dev_err(dev, "failed to enable cec_clk: %d\n", ret);
> +               return ret;
> +       }
> +
> +       ret = clk_prepare_enable(hdmi->osc_clk);
> +       if (ret) {
> +               dev_err(dev, "failed to enable osc_clk: %d\n", ret);
> +               goto disable_cec_clk;
> +       }
> +
> +       ret = clk_prepare_enable(hdmi->xclk);
> +       if (ret) {
> +               dev_err(dev, "failed to enable xclk: %d\n", ret);
> +               goto disable_osc_clk;
> +       }

Perhaps add a TODO above hdmi_hw_init() to move it and the clock
enables to .enable and conversely implement .disable?

> +
> +
> +       ret = zx_hdmi_ddc_register(hdmi);
> +       if (ret) {
> +               dev_err(dev, "failed to register ddc: %d\n", ret);
> +               goto disable_xclk;
> +       }
> +
> +       ret = zx_hdmi_register(drm, hdmi);
> +       if (ret) {
> +               dev_err(dev, "failed to register hdmi: %d\n", ret);
> +               goto disable_xclk;
> +       }
> +
> +       ret = devm_request_threaded_irq(dev, irq, zx_hdmi_irq_handler,
> +                                       zx_hdmi_irq_thread, IRQF_SHARED,
> +                                       dev_name(dev), hdmi);
> +       if (ret) {
> +               dev_err(dev, "failed to request threaded irq: %d\n", ret);
> +               goto disable_xclk;
> +       }
> +
> +       return 0;
> +
> +disable_xclk:
> +       clk_disable_unprepare(hdmi->xclk);
> +disable_osc_clk:
> +       clk_disable_unprepare(hdmi->osc_clk);
> +disable_cec_clk:
> +       clk_disable_unprepare(hdmi->cec_clk);
> +       return ret;
> +}
> +
> +static void zx_hdmi_unbind(struct device *dev, struct device *master,
> +                          void *data)
> +{
> +       struct zx_hdmi *hdmi = dev_get_drvdata(dev);
> +
> +       clk_disable_unprepare(hdmi->xclk);
> +       clk_disable_unprepare(hdmi->osc_clk);
> +       clk_disable_unprepare(hdmi->cec_clk);
> +}
> +
> +static const struct component_ops zx_hdmi_component_ops = {
> +       .bind = zx_hdmi_bind,
> +       .unbind = zx_hdmi_unbind,
> +};
> +
> +static int zx_hdmi_probe(struct platform_device *pdev)
> +{
> +       return component_add(&pdev->dev, &zx_hdmi_component_ops);
> +}
> +
> +static int zx_hdmi_remove(struct platform_device *pdev)
> +{
> +       component_del(&pdev->dev, &zx_hdmi_component_ops);
> +       return 0;
> +}
> +
> +static const struct of_device_id zx_hdmi_of_match[] = {
> +       { .compatible = "zte,zx296718-hdmi", },
> +       { /* end */ },
> +};
> +MODULE_DEVICE_TABLE(of, zx_hdmi_of_match);
> +
> +struct platform_driver zx_hdmi_driver = {
> +       .probe = zx_hdmi_probe,
> +       .remove = zx_hdmi_remove,
> +       .driver = {
> +               .name = "zx-hdmi",
> +               .of_match_table = zx_hdmi_of_match,
> +       },
> +};
> diff --git a/drivers/gpu/drm/zte/zx_plane.c b/drivers/gpu/drm/zte/zx_plane.c
> new file mode 100644
> index 000000000000..fdab1715bee5
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_plane.c
> @@ -0,0 +1,375 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_modeset_helper_vtables.h>
> +#include <drm/drm_plane_helper.h>
> +#include <drm/drmP.h>
> +
> +#include "zx_drm_drv.h"
> +#include "zx_plane.h"
> +#include "zx_vou.h"
> +
> +/* GL registers */
> +#define GL_CTRL0                       0x00
> +#define GL_UPDATE                      BIT(5)
> +#define GL_CTRL1                       0x04
> +#define GL_DATA_FMT_SHIFT              0
> +#define GL_DATA_FMT_MASK               (0xf << GL_DATA_FMT_SHIFT)
> +#define GL_FMT_ARGB8888                        0
> +#define GL_FMT_RGB888                  1
> +#define GL_FMT_RGB565                  2
> +#define GL_FMT_ARGB1555                        3
> +#define GL_FMT_ARGB4444                        4
> +#define GL_CTRL2                       0x08
> +#define GL_GLOBAL_ALPHA_SHIFT          8
> +#define GL_GLOBAL_ALPHA_MASK           (0xff << GL_GLOBAL_ALPHA_SHIFT)
> +#define GL_CTRL3                       0x0c
> +#define GL_SCALER_BYPASS_MODE          BIT(0)
> +#define GL_STRIDE                      0x18
> +#define GL_ADDR                                0x1c
> +#define GL_SRC_SIZE                    0x38
> +#define GL_SRC_W_SHIFT                 16
> +#define GL_SRC_W_MASK                  (0x3fff << GL_SRC_W_SHIFT)
> +#define GL_SRC_H_SHIFT                 0
> +#define GL_SRC_H_MASK                  (0x3fff << GL_SRC_H_SHIFT)
> +#define GL_POS_START                   0x9c
> +#define GL_POS_END                     0xa0
> +#define GL_POS_X_SHIFT                 16
> +#define GL_POS_X_MASK                  (0x1fff << GL_POS_X_SHIFT)
> +#define GL_POS_Y_SHIFT                 0
> +#define GL_POS_Y_MASK                  (0x1fff << GL_POS_Y_SHIFT)
> +
> +#define GL_SRC_W(x)    (((x) << GL_SRC_W_SHIFT) & GL_SRC_W_MASK)
> +#define GL_SRC_H(x)    (((x) << GL_SRC_H_SHIFT) & GL_SRC_H_MASK)
> +#define GL_POS_X(x)    (((x) << GL_POS_X_SHIFT) & GL_POS_X_MASK)
> +#define GL_POS_Y(x)    (((x) << GL_POS_Y_SHIFT) & GL_POS_Y_MASK)
> +
> +/* CSC registers */
> +#define CSC_CTRL0                      0x30
> +#define CSC_COV_MODE_SHIFT             16
> +#define CSC_COV_MODE_MASK              (0xffff << CSC_COV_MODE_SHIFT)
> +#define CSC_BT601_IMAGE_RGB2YCBCR      0
> +#define CSC_BT601_IMAGE_YCBCR2RGB      1
> +#define CSC_BT601_VIDEO_RGB2YCBCR      2
> +#define CSC_BT601_VIDEO_YCBCR2RGB      3
> +#define CSC_BT709_IMAGE_RGB2YCBCR      4
> +#define CSC_BT709_IMAGE_YCBCR2RGB      5
> +#define CSC_BT709_VIDEO_RGB2YCBCR      6
> +#define CSC_BT709_VIDEO_YCBCR2RGB      7
> +#define CSC_BT2020_IMAGE_RGB2YCBCR     8
> +#define CSC_BT2020_IMAGE_YCBCR2RGB     9
> +#define CSC_BT2020_VIDEO_RGB2YCBCR     10
> +#define CSC_BT2020_VIDEO_YCBCR2RGB     11
> +#define CSC_WORK_ENABLE                        BIT(0)
> +
> +/* RSZ registers */
> +#define RSZ_SRC_CFG                    0x00
> +#define RSZ_DEST_CFG                   0x04
> +#define RSZ_ENABLE_CFG                 0x14
> +
> +#define RSZ_VER_SHIFT                  16
> +#define RSZ_VER_MASK                   (0xffff << RSZ_VER_SHIFT)
> +#define RSZ_HOR_SHIFT                  0
> +#define RSZ_HOR_MASK                   (0xffff << RSZ_HOR_SHIFT)
> +
> +#define RSZ_VER(x)     (((x) << RSZ_VER_SHIFT) & RSZ_VER_MASK)
> +#define RSZ_HOR(x)     (((x) << RSZ_HOR_SHIFT) & RSZ_HOR_MASK)
> +
> +/* HBSC registers */
> +#define HBSC_SATURATION                        0x00
> +#define HBSC_HUE                       0x04
> +#define HBSC_BRIGHT                    0x08
> +#define HBSC_CONTRAST                  0x0c
> +#define HBSC_THRESHOLD_COL1            0x10
> +#define HBSC_THRESHOLD_COL2            0x14
> +#define HBSC_THRESHOLD_COL3            0x18
> +#define HBSC_CTRL0                     0x28
> +#define HBSC_CTRL_EN                   BIT(2)
> +
> +struct zx_plane {
> +       struct drm_plane plane;
> +       void __iomem *layer;
> +       void __iomem *csc;
> +       void __iomem *hbsc;
> +       void __iomem *rsz;
> +};
> +
> +#define to_zx_plane(plane)     container_of(plane, struct zx_plane, plane)
> +
> +static const uint32_t gl_formats[] = {
> +       DRM_FORMAT_ARGB8888,
> +       DRM_FORMAT_XRGB8888,
> +       DRM_FORMAT_RGB888,
> +       DRM_FORMAT_RGB565,
> +       DRM_FORMAT_ARGB1555,
> +       DRM_FORMAT_ARGB4444,
> +};
> +
> +static int zx_gl_plane_atomic_check(struct drm_plane *plane,
> +                                   struct drm_plane_state *plane_state)
> +{
> +       struct drm_framebuffer *fb = plane_state->fb;
> +       struct drm_crtc *crtc = plane_state->crtc;
> +       struct drm_crtc_state *crtc_state;
> +       struct drm_rect clip;
> +
> +       if (!crtc || !fb)
> +               return 0;
> +
> +       crtc_state = drm_atomic_get_existing_crtc_state(plane_state->state,
> +                                                       crtc);
> +       if (WARN_ON(!crtc_state))
> +               return -EINVAL;
> +
> +       /* plane must match crtc enable state */
> +       if (crtc_state->enable != !!plane_state->crtc)
> +               return -EINVAL;
> +
> +       /* nothing to check when disabling or disabled */
> +       if (!crtc_state->enable)
> +               return 0;

I think you can shuffle things around here to read a bit clearer:

if (!crtc_state->enable)
        return 0;

if (!plane_state->crtc)
        return -EINVAL

> +
> +       clip.x1 = 0;
> +       clip.y1 = 0;
> +       clip.x2 = crtc_state->adjusted_mode.hdisplay;
> +       clip.y2 = crtc_state->adjusted_mode.vdisplay;
> +
> +       return drm_plane_helper_check_state(plane_state, &clip,
> +                                           DRM_PLANE_HELPER_NO_SCALING,
> +                                           DRM_PLANE_HELPER_NO_SCALING,
> +                                           false, true);
> +}
> +
> +static int zx_gl_get_fmt(uint32_t format)
> +{
> +       switch (format) {
> +       case DRM_FORMAT_ARGB8888:
> +       case DRM_FORMAT_XRGB8888:
> +               return GL_FMT_ARGB8888;
> +       case DRM_FORMAT_RGB888:
> +               return GL_FMT_RGB888;
> +       case DRM_FORMAT_RGB565:
> +               return GL_FMT_RGB565;
> +       case DRM_FORMAT_ARGB1555:
> +               return GL_FMT_ARGB1555;
> +       case DRM_FORMAT_ARGB4444:
> +               return GL_FMT_ARGB4444;
> +       default:
> +               WARN_ONCE(1, "invalid pixel format %d\n", format);
> +               return -EINVAL;
> +       }
> +}
> +
> +static inline void zx_gl_set_update(struct zx_plane *zplane)
> +{
> +       void __iomem *layer = zplane->layer;
> +
> +       zx_writel_mask(layer + GL_CTRL0, GL_UPDATE, GL_UPDATE);
> +}
> +
> +static inline void zx_gl_rsz_set_update(struct zx_plane *zplane)
> +{
> +       zx_writel(zplane->rsz + RSZ_ENABLE_CFG, 1);
> +}
> +
> +void zx_plane_set_update(struct drm_plane *plane)
> +{
> +       struct zx_plane *zplane = to_zx_plane(plane);
> +
> +       zx_gl_rsz_set_update(zplane);
> +       zx_gl_set_update(zplane);
> +}
> +
> +static void zx_gl_rsz_setup(struct zx_plane *zplane, u32 src_w, u32 src_h,
> +                           u32 dst_w, u32 dst_h)
> +{
> +       void __iomem *rsz = zplane->rsz;
> +
> +       zx_writel(rsz + RSZ_SRC_CFG, RSZ_VER(src_h - 1) | RSZ_HOR(src_w - 1));
> +       zx_writel(rsz + RSZ_DEST_CFG, RSZ_VER(dst_h - 1) | RSZ_HOR(dst_w - 1));
> +
> +       zx_gl_rsz_set_update(zplane);
> +}
> +
> +static void zx_gl_plane_atomic_update(struct drm_plane *plane,
> +                                     struct drm_plane_state *old_state)
> +{
> +       struct zx_plane *zplane = to_zx_plane(plane);
> +       struct drm_framebuffer *fb = plane->state->fb;
> +       struct drm_gem_cma_object *cma_obj;
> +       void __iomem *layer = zplane->layer;
> +       void __iomem *csc = zplane->csc;
> +       void __iomem *hbsc = zplane->hbsc;
> +       u32 src_x, src_y, src_w, src_h;
> +       u32 dst_x, dst_y, dst_w, dst_h;
> +       unsigned int depth, bpp;
> +       uint32_t format;
> +       dma_addr_t paddr;
> +       u32 stride;
> +       int fmt;
> +
> +       if (!fb)
> +               return;
> +
> +       format = fb->pixel_format;
> +       stride = fb->pitches[0];
> +
> +       src_x = plane->state->src_x >> 16;
> +       src_y = plane->state->src_y >> 16;
> +       src_w = plane->state->src_w >> 16;
> +       src_h = plane->state->src_h >> 16;
> +
> +       dst_x = plane->state->crtc_x;
> +       dst_y = plane->state->crtc_y;
> +       dst_w = plane->state->crtc_w;
> +       dst_h = plane->state->crtc_h;
> +
> +       drm_fb_get_bpp_depth(format, &depth, &bpp);
> +
> +       cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
> +       paddr = cma_obj->paddr + fb->offsets[0];
> +       paddr += src_y * stride + src_x * bpp / 8;
> +       zx_writel(layer + GL_ADDR, paddr);
> +
> +       /* Set up source height/width register */
> +       zx_writel(layer + GL_SRC_SIZE, GL_SRC_W(src_w) | GL_SRC_H(src_h));
> +
> +       /* Set up start position register */
> +       zx_writel(layer + GL_POS_START, GL_POS_X(dst_x) | GL_POS_Y(dst_y));
> +
> +       /* Set up end position register */
> +       zx_writel(layer + GL_POS_END,
> +                 GL_POS_X(dst_x + dst_w) | GL_POS_Y(dst_y + dst_h));
> +
> +       /* Set up stride register */
> +       zx_writel(layer + GL_STRIDE, stride & 0xffff);
> +
> +       /* Set up graphic layer data format */
> +       fmt = zx_gl_get_fmt(format);
> +       if (fmt >= 0)
> +               zx_writel_mask(layer + GL_CTRL1, GL_DATA_FMT_MASK,
> +                              fmt << GL_DATA_FMT_SHIFT);
> +
> +       /* Initialize global alpha with a sane value */
> +       zx_writel_mask(layer + GL_CTRL2, GL_GLOBAL_ALPHA_MASK,
> +                      0xff << GL_GLOBAL_ALPHA_SHIFT);
> +
> +       /* Setup CSC for the GL */
> +       if (dst_h > 720)
> +               zx_writel_mask(csc + CSC_CTRL0, CSC_COV_MODE_MASK,
> +                              CSC_BT709_IMAGE_RGB2YCBCR << CSC_COV_MODE_SHIFT);
> +       else
> +               zx_writel_mask(csc + CSC_CTRL0, CSC_COV_MODE_MASK,
> +                              CSC_BT601_IMAGE_RGB2YCBCR << CSC_COV_MODE_SHIFT);
> +       zx_writel_mask(csc + CSC_CTRL0, CSC_WORK_ENABLE, CSC_WORK_ENABLE);
> +
> +       /* Always use scaler since it exists (set for not bypass) */
> +       zx_writel_mask(layer + GL_CTRL3, GL_SCALER_BYPASS_MODE,
> +                      GL_SCALER_BYPASS_MODE);
> +
> +       zx_gl_rsz_setup(zplane, src_w, src_h, dst_w, dst_h);
> +
> +       /* Enable HBSC block */
> +       zx_writel_mask(hbsc + HBSC_CTRL0, HBSC_CTRL_EN, HBSC_CTRL_EN);
> +
> +       zx_gl_set_update(zplane);
> +}
> +
> +static const struct drm_plane_helper_funcs zx_gl_plane_helper_funcs = {
> +       .atomic_check = zx_gl_plane_atomic_check,
> +       .atomic_update = zx_gl_plane_atomic_update,
> +};
> +
> +static void zx_plane_destroy(struct drm_plane *plane)
> +{
> +       drm_plane_helper_disable(plane);
> +       drm_plane_cleanup(plane);
> +}
> +
> +static const struct drm_plane_funcs zx_plane_funcs = {
> +       .update_plane = drm_atomic_helper_update_plane,
> +       .disable_plane = drm_atomic_helper_disable_plane,
> +       .destroy = zx_plane_destroy,
> +       .reset = drm_atomic_helper_plane_reset,
> +       .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
> +       .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
> +};
> +
> +static void zx_plane_hbsc_init(struct zx_plane *zplane)
> +{
> +       void __iomem *hbsc = zplane->hbsc;
> +
> +       /*
> +        *  Initialize HBSC block with a sane configuration per recommedation
> +        *  from ZTE BSP code.
> +        */
> +       zx_writel(hbsc + HBSC_SATURATION, 0x200);
> +       zx_writel(hbsc + HBSC_HUE, 0x0);
> +       zx_writel(hbsc + HBSC_BRIGHT, 0x0);
> +       zx_writel(hbsc + HBSC_CONTRAST, 0x200);
> +
> +       zx_writel(hbsc + HBSC_THRESHOLD_COL1, (0x3ac << 16) | 0x40);
> +       zx_writel(hbsc + HBSC_THRESHOLD_COL2, (0x3c0 << 16) | 0x40);
> +       zx_writel(hbsc + HBSC_THRESHOLD_COL3, (0x3c0 << 16) | 0x40);
> +}
> +
> +struct drm_plane *zx_plane_init(struct drm_device *drm, struct device *dev,
> +                               struct zx_layer_data *data,
> +                               enum drm_plane_type type)
> +{
> +       const struct drm_plane_helper_funcs *helper;
> +       struct zx_plane *zplane;
> +       struct drm_plane *plane;
> +       const uint32_t *formats;
> +       unsigned int format_count;
> +       int ret;
> +
> +       zplane = devm_kzalloc(dev, sizeof(*zplane), GFP_KERNEL);
> +       if (!zplane)
> +               return ERR_PTR(-ENOMEM);
> +
> +       plane = &zplane->plane;
> +
> +       zplane->layer = data->layer;
> +       zplane->hbsc = data->hbsc;
> +       zplane->csc = data->csc;
> +       zplane->rsz = data->rsz;
> +
> +       zx_plane_hbsc_init(zplane);
> +
> +       switch (type) {
> +       case DRM_PLANE_TYPE_PRIMARY:
> +               helper = &zx_gl_plane_helper_funcs;
> +               formats = gl_formats;
> +               format_count = ARRAY_SIZE(gl_formats);
> +               break;
> +       case DRM_PLANE_TYPE_OVERLAY:
> +               /* TODO: add video layer (vl) support */
> +               break;
> +       default:
> +               return ERR_PTR(-ENODEV);
> +       }
> +
> +       ret = drm_universal_plane_init(drm, plane, VOU_CRTC_MASK,
> +                                      &zx_plane_funcs, formats, format_count,
> +                                      type, NULL);
> +       if (ret) {
> +               dev_err(dev, "failed to init universal plane: %d\n", ret);
> +               return ERR_PTR(ret);
> +       }
> +
> +       drm_plane_helper_add(plane, helper);
> +
> +       return plane;
> +}
> diff --git a/drivers/gpu/drm/zte/zx_plane.h b/drivers/gpu/drm/zte/zx_plane.h
> new file mode 100644
> index 000000000000..2b82cd558d9d
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_plane.h
> @@ -0,0 +1,26 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#ifndef __ZX_PLANE_H__
> +#define __ZX_PLANE_H__
> +
> +struct zx_layer_data {
> +       void __iomem *layer;
> +       void __iomem *csc;
> +       void __iomem *hbsc;
> +       void __iomem *rsz;
> +};
> +
> +struct drm_plane *zx_plane_init(struct drm_device *drm, struct device *dev,
> +                               struct zx_layer_data *data,
> +                               enum drm_plane_type type);
> +void zx_plane_set_update(struct drm_plane *plane);
> +
> +#endif /* __ZX_PLANE_H__ */
> diff --git a/drivers/gpu/drm/zte/zx_vou.c b/drivers/gpu/drm/zte/zx_vou.c
> new file mode 100644
> index 000000000000..676c750d6009
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_vou.c
> @@ -0,0 +1,799 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/component.h>
> +#include <linux/of_address.h>
> +#include <video/videomode.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_plane_helper.h>
> +#include <drm/drmP.h>
> +
> +#include "zx_drm_drv.h"
> +#include "zx_plane.h"
> +#include "zx_vou.h"
> +
> +/* Sub-module offset */
> +#define MAIN_GL_OFFSET                 0x130
> +#define MAIN_CSC_OFFSET                        0x580
> +#define MAIN_HBSC_OFFSET               0x820
> +#define MAIN_RSZ_OFFSET                        0x600 /* OTFPPU sub-module */
> +
> +#define AUX_GL_OFFSET                  0x200
> +#define AUX_CSC_OFFSET                 0x5d0
> +#define AUX_HBSC_OFFSET                        0x860
> +#define AUX_RSZ_OFFSET                 0x800
> +
> +/* OSD (GPC_GLOBAL) registers */
> +#define OSD_INT_STA                    0x04
> +#define OSD_INT_CLRSTA                 0x08
> +#define OSD_INT_MSK                    0x0c
> +#define OSD_INT_AUX_UPT                        BIT(14)
> +#define OSD_INT_MAIN_UPT               BIT(13)
> +#define OSD_INT_GL1_LBW                        BIT(10)
> +#define OSD_INT_GL0_LBW                        BIT(9)
> +#define OSD_INT_VL2_LBW                        BIT(8)
> +#define OSD_INT_VL1_LBW                        BIT(7)
> +#define OSD_INT_VL0_LBW                        BIT(6)
> +#define OSD_INT_BUS_ERR                        BIT(3)
> +#define OSD_INT_CFG_ERR                        BIT(2)
> +#define OSD_INT_ERROR (\
> +       OSD_INT_GL1_LBW | OSD_INT_GL0_LBW | \
> +       OSD_INT_VL2_LBW | OSD_INT_VL1_LBW | OSD_INT_VL0_LBW | \
> +       OSD_INT_BUS_ERR | OSD_INT_CFG_ERR \
> +)
> +#define OSD_INT_ENABLE (OSD_INT_ERROR | OSD_INT_AUX_UPT | OSD_INT_MAIN_UPT)
> +#define OSD_CTRL0                      0x10
> +#define OSD_CTRL0_GL0_EN               BIT(7)
> +#define OSD_CTRL0_GL0_SEL              BIT(6)
> +#define OSD_CTRL0_GL1_EN               BIT(5)
> +#define OSD_CTRL0_GL1_SEL              BIT(4)
> +#define OSD_RST_CLR                    0x1c
> +#define RST_PER_FRAME                  BIT(19)
> +
> +/* Main/Aux channel registers */
> +#define OSD_MAIN_CHN                   0x470
> +#define OSD_AUX_CHN                    0x4d0
> +#define CHN_CTRL0                      0x00
> +#define CHN_ENABLE                     BIT(0)
> +#define CHN_CTRL1                      0x04
> +#define CHN_SCREEN_W_SHIFT             18
> +#define CHN_SCREEN_W_MASK              (0x1fff << CHN_SCREEN_W_SHIFT)
> +#define CHN_SCREEN_H_SHIFT             5
> +#define CHN_SCREEN_H_MASK              (0x1fff << CHN_SCREEN_H_SHIFT)
> +#define CHN_UPDATE                     0x08
> +
> +/* TIMING_CTRL registers */
> +#define TIMING_TC_ENABLE               0x04
> +#define AUX_TC_EN                      BIT(1)
> +#define MAIN_TC_EN                     BIT(0)
> +#define FIR_MAIN_ACTIVE                        0x08
> +#define FIR_AUX_ACTIVE                 0x0c
> +#define V_ACTIVE_SHIFT                 16
> +#define V_ACTIVE_MASK                  (0xffff << V_ACTIVE_SHIFT)
> +#define H_ACTIVE_SHIFT                 0
> +#define H_ACTIVE_MASK                  (0xffff << H_ACTIVE_SHIFT)
> +#define FIR_MAIN_H_TIMING              0x10
> +#define FIR_MAIN_V_TIMING              0x14
> +#define FIR_AUX_H_TIMING               0x18
> +#define FIR_AUX_V_TIMING               0x1c
> +#define SYNC_WIDE_SHIFT                        22
> +#define SYNC_WIDE_MASK                 (0x3ff << SYNC_WIDE_SHIFT)
> +#define BACK_PORCH_SHIFT               11
> +#define BACK_PORCH_MASK                        (0x7ff << BACK_PORCH_SHIFT)
> +#define FRONT_PORCH_SHIFT              0
> +#define FRONT_PORCH_MASK               (0x7ff << FRONT_PORCH_SHIFT)
> +#define TIMING_CTRL                    0x20
> +#define AUX_POL_SHIFT                  3
> +#define AUX_POL_MASK                   (0x7 << AUX_POL_SHIFT)
> +#define MAIN_POL_SHIFT                 0
> +#define MAIN_POL_MASK                  (0x7 << MAIN_POL_SHIFT)
> +#define POL_DE_SHIFT                   2
> +#define POL_VSYNC_SHIFT                        1
> +#define POL_HSYNC_SHIFT                        0
> +#define TIMING_INT_CTRL                        0x24
> +#define TIMING_INT_STATE               0x28
> +#define TIMING_INT_AUX_FRAME           BIT(3)
> +#define TIMING_INT_MAIN_FRAME          BIT(1)
> +#define TIMING_INT_AUX_FRAME_SEL_VSW   (0x2 << 10)
> +#define TIMING_INT_MAIN_FRAME_SEL_VSW  (0x2 << 6)
> +#define TIMING_INT_ENABLE (\
> +       TIMING_INT_MAIN_FRAME_SEL_VSW | TIMING_INT_AUX_FRAME_SEL_VSW | \
> +       TIMING_INT_MAIN_FRAME | TIMING_INT_AUX_FRAME \
> +)
> +#define TIMING_MAIN_SHIFT              0x2c
> +#define TIMING_AUX_SHIFT               0x30
> +#define H_SHIFT_VAL                    0x0048
> +#define TIMING_MAIN_PI_SHIFT           0x68
> +#define TIMING_AUX_PI_SHIFT            0x6c
> +#define H_PI_SHIFT_VAL                 0x000f
> +
> +#define V_ACTIVE(x)    (((x) << V_ACTIVE_SHIFT) & V_ACTIVE_MASK)
> +#define H_ACTIVE(x)    (((x) << H_ACTIVE_SHIFT) & H_ACTIVE_MASK)
> +
> +#define SYNC_WIDE(x)   (((x) << SYNC_WIDE_SHIFT) & SYNC_WIDE_MASK)
> +#define BACK_PORCH(x)  (((x) << BACK_PORCH_SHIFT) & BACK_PORCH_MASK)
> +#define FRONT_PORCH(x) (((x) << FRONT_PORCH_SHIFT) & FRONT_PORCH_MASK)
> +
> +/* DTRC registers */
> +#define DTRC_F0_CTRL                   0x2c
> +#define DTRC_F1_CTRL                   0x5c
> +#define DTRC_DECOMPRESS_BYPASS         BIT(17)
> +#define DTRC_DETILE_CTRL               0x68
> +#define TILE2RASTESCAN_BYPASS_MODE     BIT(30)
> +#define DETILE_ARIDR_MODE_MASK         (0x3 << 0)
> +#define DETILE_ARID_ALL                        0
> +#define DETILE_ARID_IN_ARIDR           1
> +#define DETILE_ARID_BYP_BUT_ARIDR      2
> +#define DETILE_ARID_IN_ARIDR2          3
> +#define DTRC_ARID                      0x6c
> +#define DTRC_ARID3_SHIFT               24
> +#define DTRC_ARID3_MASK                        (0xff << DTRC_ARID3_SHIFT)
> +#define DTRC_ARID2_SHIFT               16
> +#define DTRC_ARID2_MASK                        (0xff << DTRC_ARID2_SHIFT)
> +#define DTRC_ARID1_SHIFT               8
> +#define DTRC_ARID1_MASK                        (0xff << DTRC_ARID1_SHIFT)
> +#define DTRC_ARID0_SHIFT               0
> +#define DTRC_ARID0_MASK                        (0xff << DTRC_ARID0_SHIFT)
> +#define DTRC_DEC2DDR_ARID              0x70
> +
> +#define DTRC_ARID3(x)  (((x) << DTRC_ARID3_SHIFT) & DTRC_ARID3_MASK)
> +#define DTRC_ARID2(x)  (((x) << DTRC_ARID2_SHIFT) & DTRC_ARID2_MASK)
> +#define DTRC_ARID1(x)  (((x) << DTRC_ARID1_SHIFT) & DTRC_ARID1_MASK)
> +#define DTRC_ARID0(x)  (((x) << DTRC_ARID0_SHIFT) & DTRC_ARID0_MASK)
> +
> +/* VOU_CTRL registers */
> +#define VOU_INF_EN                     0x00
> +#define VOU_INF_CH_SEL                 0x04
> +#define VOU_INF_DATA_SEL               0x08
> +#define VOU_SOFT_RST                   0x14
> +#define VOU_CLK_SEL                    0x18
> +#define VOU_CLK_GL1_SEL                        BIT(5)
> +#define VOU_CLK_GL0_SEL                        BIT(4)
> +#define VOU_CLK_REQEN                  0x20
> +#define VOU_CLK_EN                     0x24
> +
> +/* OTFPPU_CTRL registers */
> +#define OTFPPU_RSZ_DATA_SOURCE         0x04
> +

I find the register definitions pretty distracting here (and elsewhere
in the driver), I suppose my personal preference would be to hide them
in the headers.

> +#define GL_NUM                         2
> +#define VL_NUM                         3
> +
> +enum vou_chn_type {
> +       VOU_CHN_MAIN,
> +       VOU_CHN_AUX,
> +};
> +
> +struct zx_crtc_regs {
> +       u32 fir_active;
> +       u32 fir_htiming;
> +       u32 fir_vtiming;
> +       u32 timing_shift;
> +       u32 timing_pi_shift;
> +};
> +
> +static const struct zx_crtc_regs main_crtc_regs = {
> +       .fir_active = FIR_MAIN_ACTIVE,
> +       .fir_htiming = FIR_MAIN_H_TIMING,
> +       .fir_vtiming = FIR_MAIN_V_TIMING,
> +       .timing_shift = TIMING_MAIN_SHIFT,
> +       .timing_pi_shift = TIMING_MAIN_PI_SHIFT,
> +};
> +
> +static const struct zx_crtc_regs aux_crtc_regs = {
> +       .fir_active = FIR_AUX_ACTIVE,
> +       .fir_htiming = FIR_AUX_H_TIMING,
> +       .fir_vtiming = FIR_AUX_V_TIMING,
> +       .timing_shift = TIMING_AUX_SHIFT,
> +       .timing_pi_shift = TIMING_AUX_PI_SHIFT,
> +};
> +
> +struct zx_crtc_bits {
> +       u32 polarity_mask;
> +       u32 polarity_shift;
> +       u32 tc_enable;
> +       u32 gl_enable;
> +};
> +
> +static const struct zx_crtc_bits main_crtc_bits = {
> +       .polarity_mask = MAIN_POL_MASK,
> +       .polarity_shift = MAIN_POL_SHIFT,
> +       .tc_enable = MAIN_TC_EN,
> +       .gl_enable = OSD_CTRL0_GL0_EN,
> +};
> +
> +static const struct zx_crtc_bits aux_crtc_bits = {
> +       .polarity_mask = AUX_POL_MASK,
> +       .polarity_shift = AUX_POL_SHIFT,
> +       .tc_enable = AUX_TC_EN,
> +       .gl_enable = OSD_CTRL0_GL1_EN,
> +};
> +
> +struct zx_crtc {
> +       struct drm_crtc crtc;
> +       struct drm_plane *primary;
> +       struct zx_vou_hw *vou;
> +       void __iomem *chnreg;
> +       const struct zx_crtc_regs *regs;
> +       const struct zx_crtc_bits *bits;
> +       enum vou_chn_type chn_type;
> +       struct clk *pixclk;
> +};
> +
> +#define to_zx_crtc(x) container_of(x, struct zx_crtc, crtc)
> +
> +struct zx_vou_hw {
> +       struct device *dev;
> +       void __iomem *osd;
> +       void __iomem *timing;
> +       void __iomem *vouctl;
> +       void __iomem *otfppu;
> +       void __iomem *dtrc;
> +       struct clk *axi_clk;
> +       struct clk *ppu_clk;
> +       struct clk *main_clk;
> +       struct clk *aux_clk;
> +       struct zx_crtc *main_crtc;
> +       struct zx_crtc *aux_crtc;
> +};
> +
> +static inline struct zx_vou_hw *crtc_to_vou(struct drm_crtc *crtc)
> +{
> +       struct zx_crtc *zcrtc = to_zx_crtc(crtc);
> +
> +       return zcrtc->vou;
> +}
> +
> +void vou_inf_enable(const struct vou_inf *inf, struct drm_crtc *crtc)
> +{
> +       struct zx_crtc *zcrtc = to_zx_crtc(crtc);
> +       struct zx_vou_hw *vou = zcrtc->vou;
> +       bool is_main = zcrtc->chn_type == VOU_CHN_MAIN;
> +       u32 data_sel_shift = inf->id << 1;
> +
> +       /* Select data format */
> +       zx_writel_mask(vou->vouctl + VOU_INF_DATA_SEL, 0x3 << data_sel_shift,
> +                      inf->data_sel << data_sel_shift);
> +
> +       /* Select channel */
> +       zx_writel_mask(vou->vouctl + VOU_INF_CH_SEL, 0x1 << inf->id,
> +                      zcrtc->chn_type << inf->id);
> +
> +       /* Select interface clocks */
> +       zx_writel_mask(vou->vouctl + VOU_CLK_SEL, inf->clocks_sel_bits,
> +                      is_main ? 0 : inf->clocks_sel_bits);
> +
> +       /* Enable interface clocks */
> +       zx_writel_mask(vou->vouctl + VOU_CLK_EN, inf->clocks_en_bits,
> +                      inf->clocks_en_bits);
> +
> +       /* Enable the device */
> +       zx_writel_mask(vou->vouctl + VOU_INF_EN, 1 << inf->id, 1 << inf->id);
> +}
> +
> +void vou_inf_disable(const struct vou_inf *inf, struct drm_crtc *crtc)
> +{
> +       struct zx_vou_hw *vou = crtc_to_vou(crtc);
> +
> +       /* Disable the device */
> +       zx_writel_mask(vou->vouctl + VOU_INF_EN, 1 << inf->id, 0);
> +
> +       /* Disable interface clocks */
> +       zx_writel_mask(vou->vouctl + VOU_CLK_EN, inf->clocks_en_bits, 0);
> +}
> +
> +static inline void vou_chn_set_update(struct zx_crtc *zcrtc)
> +{
> +       zx_writel(zcrtc->chnreg + CHN_UPDATE, 1);
> +}
> +
> +static void zx_crtc_enable(struct drm_crtc *crtc)
> +{
> +       struct drm_display_mode *mode = &crtc->state->adjusted_mode;
> +       struct zx_crtc *zcrtc = to_zx_crtc(crtc);
> +       struct zx_vou_hw *vou = zcrtc->vou;
> +       const struct zx_crtc_regs *regs = zcrtc->regs;
> +       const struct zx_crtc_bits *bits = zcrtc->bits;
> +       struct videomode vm;
> +       u32 pol = 0;
> +       u32 val;
> +       int ret;
> +
> +       drm_display_mode_to_videomode(mode, &vm);
> +
> +       /* Set up timing parameters */
> +       val = V_ACTIVE(vm.vactive - 1);
> +       val |= H_ACTIVE(vm.hactive - 1);
> +       zx_writel(vou->timing + regs->fir_active, val);
> +
> +       val = SYNC_WIDE(vm.hsync_len - 1);
> +       val |= BACK_PORCH(vm.hback_porch - 1);
> +       val |= FRONT_PORCH(vm.hfront_porch - 1);
> +       zx_writel(vou->timing + regs->fir_htiming, val);

Yeah, this is much easier on the eyes (IMO)!

> +
> +       val = SYNC_WIDE(vm.vsync_len - 1);
> +       val |= BACK_PORCH(vm.vback_porch - 1);
> +       val |= FRONT_PORCH(vm.vfront_porch - 1);
> +       zx_writel(vou->timing + regs->fir_vtiming, val);
> +
> +       /* Set up polarities */
> +       if (vm.flags & DISPLAY_FLAGS_VSYNC_LOW)
> +               pol |= 1 << POL_VSYNC_SHIFT;
> +       if (vm.flags & DISPLAY_FLAGS_HSYNC_LOW)
> +               pol |= 1 << POL_HSYNC_SHIFT;
> +
> +       zx_writel_mask(vou->timing + TIMING_CTRL, bits->polarity_mask,
> +                      pol << bits->polarity_shift);
> +
> +       /* Setup SHIFT register by following what ZTE BSP does */
> +       zx_writel(vou->timing + regs->timing_shift, H_SHIFT_VAL);
> +       zx_writel(vou->timing + regs->timing_pi_shift, H_PI_SHIFT_VAL);
> +
> +       /* Enable TIMING_CTRL */
> +       zx_writel_mask(vou->timing + TIMING_TC_ENABLE, bits->tc_enable,
> +                      bits->tc_enable);
> +
> +       /* Configure channel screen size */
> +       zx_writel_mask(zcrtc->chnreg + CHN_CTRL1, CHN_SCREEN_W_MASK,
> +                      vm.hactive << CHN_SCREEN_W_SHIFT);
> +       zx_writel_mask(zcrtc->chnreg + CHN_CTRL1, CHN_SCREEN_H_MASK,
> +                      vm.vactive << CHN_SCREEN_H_SHIFT);
> +
> +       /* Update channel */
> +       vou_chn_set_update(zcrtc);
> +
> +       /* Enable channel */
> +       zx_writel_mask(zcrtc->chnreg + CHN_CTRL0, CHN_ENABLE, CHN_ENABLE);
> +
> +       /* Enable Graphic Layer */
> +       zx_writel_mask(vou->osd + OSD_CTRL0, bits->gl_enable,
> +                      bits->gl_enable);
> +
> +       drm_crtc_vblank_on(crtc);
> +
> +       ret = clk_set_rate(zcrtc->pixclk, mode->clock * 1000);
> +       if (ret) {
> +               dev_warn(vou->dev, "failed to set pixclk rate: %d\n", ret);
> +               return;
> +       }
> +
> +       ret = clk_prepare_enable(zcrtc->pixclk);
> +       if (ret)
> +               dev_warn(vou->dev, "failed to enable pixclk: %d\n", ret);
> +}
> +
> +static void zx_crtc_disable(struct drm_crtc *crtc)
> +{
> +       struct zx_crtc *zcrtc = to_zx_crtc(crtc);
> +       const struct zx_crtc_bits *bits = zcrtc->bits;
> +       struct zx_vou_hw *vou = zcrtc->vou;
> +
> +       clk_disable_unprepare(zcrtc->pixclk);
> +
> +       drm_crtc_vblank_off(crtc);
> +
> +       /* Disable Graphic Layer */
> +       zx_writel_mask(vou->osd + OSD_CTRL0, bits->gl_enable, 0);
> +
> +       /* Disable channel */
> +       zx_writel_mask(zcrtc->chnreg + CHN_CTRL0, CHN_ENABLE, 0);
> +
> +       /* Disable TIMING_CTRL */
> +       zx_writel_mask(vou->timing + TIMING_TC_ENABLE, bits->tc_enable, 0);
> +}
> +
> +static void zx_crtc_atomic_begin(struct drm_crtc *crtc,
> +                                struct drm_crtc_state *state)
> +{
> +       struct drm_pending_vblank_event *event = crtc->state->event;
> +
> +       if (!event)
> +               return;
> +
> +       crtc->state->event = NULL;
> +
> +       spin_lock_irq(&crtc->dev->event_lock);
> +       if (drm_crtc_vblank_get(crtc) == 0)
> +               drm_crtc_arm_vblank_event(crtc, event);
> +       else
> +               drm_crtc_send_vblank_event(crtc, event);
> +       spin_unlock_irq(&crtc->dev->event_lock);
> +}
> +
> +static const struct drm_crtc_helper_funcs zx_crtc_helper_funcs = {
> +       .enable = zx_crtc_enable,
> +       .disable = zx_crtc_disable,
> +       .atomic_begin = zx_crtc_atomic_begin,
> +};
> +
> +static const struct drm_crtc_funcs zx_crtc_funcs = {
> +       .destroy = drm_crtc_cleanup,
> +       .set_config = drm_atomic_helper_set_config,
> +       .page_flip = drm_atomic_helper_page_flip,
> +       .reset = drm_atomic_helper_crtc_reset,
> +       .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> +       .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> +};
> +
> +static int zx_crtc_init(struct drm_device *drm, struct zx_vou_hw *vou,
> +                       enum vou_chn_type chn_type)
> +{
> +       struct device *dev = vou->dev;
> +       struct zx_layer_data data;
> +       struct zx_crtc *zcrtc;
> +       int ret;
> +
> +       zcrtc = devm_kzalloc(dev, sizeof(*zcrtc), GFP_KERNEL);
> +       if (!zcrtc)
> +               return -ENOMEM;
> +
> +       zcrtc->vou = vou;
> +       zcrtc->chn_type = chn_type;
> +
> +       if (chn_type == VOU_CHN_MAIN) {
> +               data.layer = vou->osd + MAIN_GL_OFFSET;
> +               data.csc = vou->osd + MAIN_CSC_OFFSET;
> +               data.hbsc = vou->osd + MAIN_HBSC_OFFSET;
> +               data.rsz = vou->otfppu + MAIN_RSZ_OFFSET;
> +               zcrtc->chnreg = vou->osd + OSD_MAIN_CHN;
> +               zcrtc->regs = &main_crtc_regs;
> +               zcrtc->bits = &main_crtc_bits;
> +       } else {
> +               data.layer = vou->osd + AUX_GL_OFFSET;
> +               data.csc = vou->osd + AUX_CSC_OFFSET;
> +               data.hbsc = vou->osd + AUX_HBSC_OFFSET;
> +               data.rsz = vou->otfppu + AUX_RSZ_OFFSET;
> +               zcrtc->chnreg = vou->osd + OSD_AUX_CHN;
> +               zcrtc->regs = &aux_crtc_regs;
> +               zcrtc->bits = &aux_crtc_bits;
> +       }
> +
> +       zcrtc->pixclk = devm_clk_get(dev, (chn_type == VOU_CHN_MAIN) ?
> +                                         "main_wclk" : "aux_wclk");
> +       if (IS_ERR(zcrtc->pixclk)) {
> +               ret = PTR_ERR(zcrtc->pixclk);
> +               dev_err(dev, "failed to get pix clk: %d\n", ret);
> +               return ret;
> +       }
> +
> +       zcrtc->primary = zx_plane_init(drm, dev, &data, DRM_PLANE_TYPE_PRIMARY);
> +       if (IS_ERR(zcrtc->primary)) {
> +               ret = PTR_ERR(zcrtc->primary);
> +               dev_err(dev, "failed to init primary plane: %d\n", ret);
> +               return ret;
> +       }
> +
> +       ret = drm_crtc_init_with_planes(drm, &zcrtc->crtc, zcrtc->primary, NULL,
> +                                       &zx_crtc_funcs, NULL);
> +       if (ret) {
> +               dev_err(dev, "failed to init drm crtc: %d\n", ret);
> +               return ret;
> +       }
> +
> +       drm_crtc_helper_add(&zcrtc->crtc, &zx_crtc_helper_funcs);
> +
> +       if (chn_type == VOU_CHN_MAIN)
> +               vou->main_crtc = zcrtc;
> +       else
> +               vou->aux_crtc = zcrtc;
> +
> +       return 0;
> +}
> +
> +static inline struct drm_crtc *zx_find_crtc(struct drm_device *drm, int pipe)
> +{
> +       struct drm_crtc *crtc;
> +       int i = 0;
> +
> +       list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
> +               if (i++ == pipe)
> +                       return crtc;
> +
> +       return NULL;
> +}

We have drm_plane_from_index, it seems like at least 2 drivers would
benefit from drm_crtc_from_index. Either way, you should probably
change this code to compare pipe to crtc->index instead of rolling
your own index counter.

> +
> +int zx_vou_enable_vblank(struct drm_device *drm, unsigned int pipe)
> +{
> +       struct drm_crtc *crtc;
> +       struct zx_vou_hw *vou;
> +
> +       crtc = zx_find_crtc(drm, pipe);
> +       if (!crtc)
> +               return 0;
> +
> +       vou = crtc_to_vou(crtc);
> +
> +       if (pipe == 0)
> +               zx_writel_mask(vou->timing + TIMING_INT_CTRL,
> +                              TIMING_INT_MAIN_FRAME, TIMING_INT_MAIN_FRAME);
> +       else
> +               zx_writel_mask(vou->timing + TIMING_INT_CTRL,
> +                              TIMING_INT_AUX_FRAME, TIMING_INT_AUX_FRAME);
> +

It seems like this could also benefit from crtc_bits/crtc_regs

> +       return 0;
> +}
> +
> +void zx_vou_disable_vblank(struct drm_device *drm, unsigned int pipe)
> +{
> +       struct drm_crtc *crtc;
> +       struct zx_vou_hw *vou;
> +
> +       crtc = zx_find_crtc(drm, pipe);
> +       if (!crtc)
> +               return;
> +
> +       vou = crtc_to_vou(crtc);
> +
> +       if (pipe == 0)
> +               zx_writel_mask(vou->timing + TIMING_INT_CTRL,
> +                              TIMING_INT_MAIN_FRAME, 0);
> +       else
> +               zx_writel_mask(vou->timing + TIMING_INT_CTRL,
> +                              TIMING_INT_AUX_FRAME, 0);
> +}
> +
> +static irqreturn_t vou_irq_handler(int irq, void *dev_id)
> +{
> +       struct zx_vou_hw *vou = dev_id;
> +       u32 state;
> +
> +       /* Handle TIMING_CTRL frame interrupts */
> +       state = zx_readl(vou->timing + TIMING_INT_STATE);
> +       zx_writel(vou->timing + TIMING_INT_STATE, state);
> +
> +       if (state & TIMING_INT_MAIN_FRAME)
> +               drm_crtc_handle_vblank(&vou->main_crtc->crtc);
> +
> +       if (state & TIMING_INT_AUX_FRAME)
> +               drm_crtc_handle_vblank(&vou->aux_crtc->crtc);
> +
> +       /* Handle OSD interrupts */
> +       state = zx_readl(vou->osd + OSD_INT_STA);
> +       zx_writel(vou->osd + OSD_INT_CLRSTA, state);
> +
> +       if (state & OSD_INT_MAIN_UPT) {
> +               vou_chn_set_update(vou->main_crtc);
> +               zx_plane_set_update(vou->main_crtc->primary);
> +       }
> +
> +       if (state & OSD_INT_AUX_UPT) {
> +               vou_chn_set_update(vou->aux_crtc);
> +               zx_plane_set_update(vou->aux_crtc->primary);
> +       }
> +
> +       if (state & OSD_INT_ERROR)
> +               dev_err(vou->dev, "OSD ERROR: 0x%08x!\n", state);
> +
> +       return IRQ_HANDLED;
> +}
> +
> +static void vou_dtrc_init(struct zx_vou_hw *vou)
> +{
> +       /* Clear bit for bypass by ID */
> +       zx_writel_mask(vou->dtrc + DTRC_DETILE_CTRL,
> +                      TILE2RASTESCAN_BYPASS_MODE, 0);
> +
> +       /* Select ARIDR mode */
> +       zx_writel_mask(vou->dtrc + DTRC_DETILE_CTRL, DETILE_ARIDR_MODE_MASK,
> +                      DETILE_ARID_IN_ARIDR);
> +
> +       /* Bypass decompression for both frames */
> +       zx_writel_mask(vou->dtrc + DTRC_F0_CTRL, DTRC_DECOMPRESS_BYPASS,
> +                      DTRC_DECOMPRESS_BYPASS);
> +       zx_writel_mask(vou->dtrc + DTRC_F1_CTRL, DTRC_DECOMPRESS_BYPASS,
> +                      DTRC_DECOMPRESS_BYPASS);
> +
> +       /* Set up ARID register */
> +       zx_writel(vou->dtrc + DTRC_ARID, DTRC_ARID3(0xf) | DTRC_ARID2(0xe) |
> +                 DTRC_ARID1(0xf) | DTRC_ARID0(0xe));
> +}
> +
> +static void vou_hw_init(struct zx_vou_hw *vou)
> +{
> +       /* Set GL0 to main channel and GL1 to aux channel */
> +       zx_writel_mask(vou->osd + OSD_CTRL0, OSD_CTRL0_GL0_SEL, 0);
> +       zx_writel_mask(vou->osd + OSD_CTRL0, OSD_CTRL0_GL1_SEL,
> +                      OSD_CTRL0_GL1_SEL);
> +
> +       /* Release reset for all VOU modules */
> +       zx_writel(vou->vouctl + VOU_SOFT_RST, ~0);
> +
> +       /* Select main clock for GL0 and aux clock for GL1 module */
> +       zx_writel_mask(vou->vouctl + VOU_CLK_SEL, VOU_CLK_GL0_SEL, 0);
> +       zx_writel_mask(vou->vouctl + VOU_CLK_SEL, VOU_CLK_GL1_SEL,
> +                      VOU_CLK_GL1_SEL);
> +
> +       /* Enable clock auto-gating for all VOU modules */
> +       zx_writel(vou->vouctl + VOU_CLK_REQEN, ~0);
> +
> +       /* Enable all VOU module clocks */
> +       zx_writel(vou->vouctl + VOU_CLK_EN, ~0);
> +
> +       /* Clear both OSD and TIMING_CTRL interrupt state */
> +       zx_writel(vou->osd + OSD_INT_CLRSTA, ~0);
> +       zx_writel(vou->timing + TIMING_INT_STATE, ~0);
> +
> +       /* Enable OSD and TIMING_CTRL interrrupts */
> +       zx_writel(vou->osd + OSD_INT_MSK, OSD_INT_ENABLE);
> +       zx_writel(vou->timing + TIMING_INT_CTRL, TIMING_INT_ENABLE);
> +
> +       /* Select GPC as input to gl/vl scaler as a sane default setting */
> +       zx_writel(vou->otfppu + OTFPPU_RSZ_DATA_SOURCE, 0x2a);
> +
> +       /*
> +        * Needs to reset channel and layer logic per frame when frame starts
> +        * to get VOU work properly.
> +        */
> +       zx_writel_mask(vou->osd + OSD_RST_CLR, RST_PER_FRAME, RST_PER_FRAME);
> +
> +       vou_dtrc_init(vou);
> +}
> +
> +static int zx_crtc_bind(struct device *dev, struct device *master, void *data)
> +{
> +       struct platform_device *pdev = to_platform_device(dev);
> +       struct drm_device *drm = data;
> +       struct zx_vou_hw *vou;
> +       struct resource *res;
> +       int irq;
> +       int ret;
> +
> +       vou = devm_kzalloc(dev, sizeof(*vou), GFP_KERNEL);
> +       if (!vou)
> +               return -ENOMEM;
> +
> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "osd");
> +       vou->osd = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(vou->osd)) {
> +               ret = PTR_ERR(vou->osd);
> +               dev_err(dev, "failed to remap osd region: %d\n", ret);
> +               return ret;
> +       }
> +
> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "timing_ctrl");
> +       vou->timing = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(vou->timing)) {
> +               ret = PTR_ERR(vou->timing);
> +               dev_err(dev, "failed to remap timing_ctrl region: %d\n", ret);
> +               return ret;
> +       }
> +
> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dtrc");
> +       vou->dtrc = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(vou->dtrc)) {
> +               ret = PTR_ERR(vou->dtrc);
> +               dev_err(dev, "failed to remap dtrc region: %d\n", ret);
> +               return ret;
> +       }
> +
> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vou_ctrl");
> +       vou->vouctl = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(vou->vouctl)) {
> +               ret = PTR_ERR(vou->vouctl);
> +               dev_err(dev, "failed to remap vou_ctrl region: %d\n", ret);
> +               return ret;
> +       }
> +
> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otfppu");
> +       vou->otfppu = devm_ioremap_resource(dev, res);
> +       if (IS_ERR(vou->otfppu)) {
> +               ret = PTR_ERR(vou->otfppu);
> +               dev_err(dev, "failed to remap otfppu region: %d\n", ret);
> +               return ret;
> +       }
> +
> +       irq = platform_get_irq(pdev, 0);
> +       if (irq < 0)
> +               return irq;
> +
> +       vou->axi_clk = devm_clk_get(dev, "aclk");
> +       if (IS_ERR(vou->axi_clk)) {
> +               ret = PTR_ERR(vou->axi_clk);
> +               dev_err(dev, "failed to get axi_clk: %d\n", ret);
> +               return ret;
> +       }
> +
> +       vou->ppu_clk = devm_clk_get(dev, "ppu_wclk");
> +       if (IS_ERR(vou->ppu_clk)) {
> +               ret = PTR_ERR(vou->ppu_clk);
> +               dev_err(dev, "failed to get ppu_clk: %d\n", ret);
> +               return ret;
> +       }
> +
> +       ret = clk_prepare_enable(vou->axi_clk);
> +       if (ret) {
> +               dev_err(dev, "failed to enable axi_clk: %d\n", ret);
> +               return ret;
> +       }
> +
> +       clk_prepare_enable(vou->ppu_clk);
> +       if (ret) {
> +               dev_err(dev, "failed to enable ppu_clk: %d\n", ret);
> +               goto disable_axi_clk;
> +       }
> +
> +       vou->dev = dev;
> +       dev_set_drvdata(dev, vou);
> +
> +       vou_hw_init(vou);
> +
> +       ret = devm_request_irq(dev, irq, vou_irq_handler, 0, "zx_vou", vou);
> +       if (ret < 0) {
> +               dev_err(dev, "failed to request vou irq: %d\n", ret);
> +               goto disable_ppu_clk;
> +       }
> +
> +       ret = zx_crtc_init(drm, vou, VOU_CHN_MAIN);
> +       if (ret) {
> +               dev_err(dev, "failed to init main channel crtc: %d\n", ret);
> +               goto disable_ppu_clk;
> +       }
> +
> +       ret = zx_crtc_init(drm, vou, VOU_CHN_AUX);
> +       if (ret) {
> +               dev_err(dev, "failed to init aux channel crtc: %d\n", ret);
> +               goto disable_ppu_clk;
> +       }
> +
> +       return 0;
> +
> +disable_ppu_clk:
> +       clk_disable_unprepare(vou->ppu_clk);
> +disable_axi_clk:
> +       clk_disable_unprepare(vou->axi_clk);
> +       return ret;
> +}
> +
> +static void zx_crtc_unbind(struct device *dev, struct device *master,
> +                          void *data)
> +{
> +       struct zx_vou_hw *vou = dev_get_drvdata(dev);
> +
> +       clk_disable_unprepare(vou->axi_clk);
> +       clk_disable_unprepare(vou->ppu_clk);
> +}
> +
> +static const struct component_ops zx_crtc_component_ops = {
> +       .bind = zx_crtc_bind,
> +       .unbind = zx_crtc_unbind,
> +};
> +
> +static int zx_crtc_probe(struct platform_device *pdev)
> +{
> +       return component_add(&pdev->dev, &zx_crtc_component_ops);
> +}
> +
> +static int zx_crtc_remove(struct platform_device *pdev)
> +{
> +       component_del(&pdev->dev, &zx_crtc_component_ops);
> +       return 0;
> +}
> +
> +static const struct of_device_id zx_crtc_of_match[] = {
> +       { .compatible = "zte,zx296718-dpc", },
> +       { /* end */ },
> +};
> +MODULE_DEVICE_TABLE(of, zx_crtc_of_match);
> +
> +struct platform_driver zx_crtc_driver = {
> +       .probe = zx_crtc_probe,
> +       .remove = zx_crtc_remove,
> +       .driver = {
> +               .name = "zx-crtc",
> +               .of_match_table = zx_crtc_of_match,
> +       },
> +};
> diff --git a/drivers/gpu/drm/zte/zx_vou.h b/drivers/gpu/drm/zte/zx_vou.h
> new file mode 100644
> index 000000000000..349e06cd86f4
> --- /dev/null
> +++ b/drivers/gpu/drm/zte/zx_vou.h
> @@ -0,0 +1,46 @@
> +/*
> + * Copyright 2016 Linaro Ltd.
> + * Copyright 2016 ZTE Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + */
> +
> +#ifndef __ZX_VOU_H__
> +#define __ZX_VOU_H__
> +
> +#define VOU_CRTC_MASK          0x3
> +
> +/* VOU output interfaces */
> +enum vou_inf_id {
> +       VOU_HDMI        = 0,
> +       VOU_RGB_LCD     = 1,
> +       VOU_TV_ENC      = 2,
> +       VOU_MIPI_DSI    = 3,
> +       VOU_LVDS        = 4,
> +       VOU_VGA         = 5,
> +};
> +
> +enum vou_inf_data_sel {
> +       VOU_YUV444      = 0,
> +       VOU_RGB_101010  = 1,
> +       VOU_RGB_888     = 2,
> +       VOU_RGB_666     = 3,
> +};
> +
> +struct vou_inf {
> +       enum vou_inf_id id;
> +       enum vou_inf_data_sel data_sel;
> +       u32 clocks_en_bits;
> +       u32 clocks_sel_bits;
> +};
> +
> +void vou_inf_enable(const struct vou_inf *inf, struct drm_crtc *crtc);
> +void vou_inf_disable(const struct vou_inf *inf, struct drm_crtc *crtc);
> +
> +int zx_vou_enable_vblank(struct drm_device *drm, unsigned int pipe);
> +void zx_vou_disable_vblank(struct drm_device *drm, unsigned int pipe);
> +
> +#endif /* __ZX_VOU_H__ */
> --
> 1.9.1
>
--
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