Hi Ulrich,
On Mon, 2017-10-16 at 17:31 +0200, Ulrich Hecht wrote:
> Add fbdev support to the Mediatek DRM driver.
>
> Signed-off-by: CK Hu <ck.hu@xxxxxxxxxxxx>
> Signed-off-by: YT Shen <yt.shen@xxxxxxxxxxxx>
> Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
> Signed-off-by: Daniel Kurtz <djkurtz@xxxxxxxxxxxx>
> [uli: Forward-ported from chromeos-3.18 vendor kernel.]
> Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@xxxxxxxxx>
> ---
> drivers/gpu/drm/mediatek/Makefile | 2 +
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 8 ++
> drivers/gpu/drm/mediatek/mtk_drm_drv.h | 4 +-
> drivers/gpu/drm/mediatek/mtk_drm_fb.c | 13 +++
> drivers/gpu/drm/mediatek/mtk_drm_fb.h | 3 +
> drivers/gpu/drm/mediatek/mtk_drm_fbdev.c | 181 +++++++++++++++++++++++++++++++
> drivers/gpu/drm/mediatek/mtk_drm_fbdev.h | 32 ++++++
> 7 files changed, 242 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_fbdev.c
> create mode 100644 drivers/gpu/drm/mediatek/mtk_drm_fbdev.h
>
> diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
> index e37b55a..8306fb5 100644
> --- a/drivers/gpu/drm/mediatek/Makefile
> +++ b/drivers/gpu/drm/mediatek/Makefile
> @@ -12,6 +12,8 @@ mediatek-drm-y := mtk_disp_color.o \
> mtk_mipi_tx.o \
> mtk_dpi.o
>
> +mediatek-drm-$(CONFIG_DRM_FBDEV_EMULATION) += mtk_drm_fbdev.o
> +
> obj-$(CONFIG_DRM_MEDIATEK) += mediatek-drm.o
>
> mediatek-drm-hdmi-objs := mtk_cec.o \
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index ce99921..636b8db 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -30,6 +30,7 @@
> #include "mtk_drm_ddp_comp.h"
> #include "mtk_drm_drv.h"
> #include "mtk_drm_fb.h"
> +#include "mtk_drm_fbdev.h"
> #include "mtk_drm_gem.h"
>
> #define DRIVER_NAME "mediatek"
> @@ -257,8 +258,14 @@ static int mtk_drm_kms_init(struct drm_device *drm)
> drm_kms_helper_poll_init(drm);
> drm_mode_config_reset(drm);
>
> + ret = mtk_fbdev_init(drm);
> + if (ret)
> + goto err_kms_helper_poll_fini;
> +
> return 0;
>
> +err_kms_helper_poll_fini:
> + drm_kms_helper_poll_fini(drm);
> err_component_unbind:
> component_unbind_all(drm->dev, drm);
> err_config_cleanup:
> @@ -269,6 +276,7 @@ static int mtk_drm_kms_init(struct drm_device *drm)
>
> static void mtk_drm_kms_deinit(struct drm_device *drm)
> {
> + mtk_fbdev_fini(drm);
> drm_kms_helper_poll_fini(drm);
>
> component_unbind_all(drm->dev, drm);
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> index c3378c4..4edc002 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> @@ -14,6 +14,7 @@
> #ifndef MTK_DRM_DRV_H
> #define MTK_DRM_DRV_H
>
> +#include <drm/drm_fb_helper.h>
> #include <linux/io.h>
> #include "mtk_drm_ddp_comp.h"
>
> @@ -24,7 +25,6 @@ struct device;
> struct device_node;
> struct drm_crtc;
> struct drm_device;
> -struct drm_fb_helper;
> struct drm_property;
> struct regmap;
>
> @@ -56,6 +56,8 @@ struct mtk_drm_private {
> } commit;
>
> struct drm_atomic_state *suspend_state;
> + struct drm_fb_helper fb_helper;
> + struct drm_gem_object *fbdev_bo;
> };
>
> extern struct platform_driver mtk_ddp_driver;
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.c b/drivers/gpu/drm/mediatek/mtk_drm_fb.c
> index 0d8d506..ac8561d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_fb.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_fb.c
> @@ -96,6 +96,19 @@ static struct mtk_drm_fb *mtk_drm_framebuffer_init(struct drm_device *dev,
> return mtk_fb;
> }
>
> +struct drm_framebuffer *mtk_drm_framebuffer_create(struct drm_device *dev,
> + const struct drm_mode_fb_cmd2 *mode,
> + struct drm_gem_object *obj)
> +{
> + struct mtk_drm_fb *mtk_fb;
> +
> + mtk_fb = mtk_drm_framebuffer_init(dev, mode, obj);
> + if (IS_ERR(mtk_fb))
> + return ERR_CAST(mtk_fb);
> +
> + return &mtk_fb->base;
> +}
> +
> /*
> * Wait for any exclusive fence in fb's gem object's reservation object.
> *
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fb.h b/drivers/gpu/drm/mediatek/mtk_drm_fb.h
> index 9b2ae34..9ee1ac2 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_fb.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_fb.h
> @@ -19,5 +19,8 @@ int mtk_fb_wait(struct drm_framebuffer *fb);
> struct drm_framebuffer *mtk_drm_mode_fb_create(struct drm_device *dev,
> struct drm_file *file,
> const struct drm_mode_fb_cmd2 *cmd);
> +struct drm_framebuffer *mtk_drm_framebuffer_create(struct drm_device *dev,
> + const struct drm_mode_fb_cmd2 *mode,
> + struct drm_gem_object *obj);
>
> #endif /* MTK_DRM_FB_H */
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fbdev.c b/drivers/gpu/drm/mediatek/mtk_drm_fbdev.c
> new file mode 100644
> index 0000000..9193647
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_fbdev.c
> @@ -0,0 +1,181 @@
> +/*
> + * Copyright (c) 2016 MediaTek Inc.
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_gem.h>
> +
> +#include "mtk_drm_drv.h"
> +#include "mtk_drm_fb.h"
This should
#include "mtk_drm_fbdev.h"
as well, to avoid warnings (see below) and make sure the header
declarations match the implementation.
> +#include "mtk_drm_gem.h"
> +
> +#define to_drm_private(x) \
> + container_of(x, struct mtk_drm_private, fb_helper)
> +
> +#if 1
This superfluous "#if 1" should be removed ...
> +static int mtk_drm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
> +{
> + struct drm_fb_helper *helper = info->par;
> + struct mtk_drm_private *private = helper->dev->dev_private;
> +
> + return mtk_drm_gem_mmap_buf(private->fbdev_bo, vma);
> +}
> +#endif
... together with this "#endif".
> +
> +static struct fb_ops mtk_fbdev_ops = {
> + .owner = THIS_MODULE,
> + .fb_fillrect = drm_fb_helper_cfb_fillrect,
> + .fb_copyarea = drm_fb_helper_cfb_copyarea,
> + .fb_imageblit = drm_fb_helper_cfb_imageblit,
> + .fb_check_var = drm_fb_helper_check_var,
> + .fb_set_par = drm_fb_helper_set_par,
> + .fb_blank = drm_fb_helper_blank,
> + .fb_pan_display = drm_fb_helper_pan_display,
> + .fb_setcmap = drm_fb_helper_setcmap,
> + .fb_mmap = mtk_drm_fbdev_mmap,
> +};
> +
> +static int mtk_fbdev_probe(struct drm_fb_helper *helper,
> + struct drm_fb_helper_surface_size *sizes)
> +{
> + struct drm_device *dev = helper->dev;
> + struct mtk_drm_private *private = helper->dev->dev_private;
> + struct drm_mode_fb_cmd2 mode = { 0 };
> + struct mtk_drm_gem_obj *mtk_gem;
> + struct fb_info *info;
> + struct drm_framebuffer *fb;
> + unsigned int bytes_per_pixel;
> + unsigned long offset;
> + size_t size;
> + int err;
> +
> + bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
> +
> + mode.width = sizes->surface_width;
> + mode.height = sizes->surface_height;
> + mode.pitches[0] = sizes->surface_width * bytes_per_pixel;
> + mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
> + sizes->surface_depth);
> +
> + size = mode.pitches[0] * mode.height;
> +
> + mtk_gem = mtk_drm_gem_create(dev, size, true);
> + if (IS_ERR(mtk_gem))
> + return PTR_ERR(mtk_gem);
> +
> + private->fbdev_bo = &mtk_gem->base;
> +
> + info = drm_fb_helper_alloc_fbi(helper);
> + if (IS_ERR(info)) {
> + err = PTR_ERR(info);
> + dev_err(dev->dev, "failed to allocate framebuffer info, %d\n",
> + err);
> + goto err_gem_free_object;
> + }
> +
> + fb = mtk_drm_framebuffer_create(dev, &mode, private->fbdev_bo);
> + if (IS_ERR(fb)) {
> + err = PTR_ERR(fb);
> + dev_err(dev->dev, "failed to allocate DRM framebuffer, %d\n",
> + err);
> + goto err_release_fbi;
> + }
> + helper->fb = fb;
> +
> + info->par = helper;
> + info->flags = FBINFO_FLAG_DEFAULT;
> + info->fbops = &mtk_fbdev_ops;
> +
> + drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
> + drm_fb_helper_fill_var(info, helper, sizes->fb_width, sizes->fb_height);
> +
> + offset = info->var.xoffset * bytes_per_pixel;
> + offset += info->var.yoffset * fb->pitches[0];
> +
> + dev->mode_config.fb_base = 0;
> + info->screen_base = mtk_gem->kvaddr + offset;
To store non-__iomem pointers, there is info->screen_buffer instead of
info->screen_base, see commit 17a7b0b4d974 ("fb.h: Provide alternate
screen_base pointer").
> + info->screen_size = size;
> + info->fix.smem_len = size;
> +
> + DRM_DEBUG_KMS("FB [%ux%u]-%u offset=%lu size=%zd\n",
> + fb->width, fb->height, fb->format->depth, offset, size);
> +
> + info->skip_vt_switch = true;
> +
> + return 0;
> +
> +err_release_fbi:
> +err_gem_free_object:
> + mtk_drm_gem_free_object(&mtk_gem->base);
> + return err;
> +}
> +
> +static const struct drm_fb_helper_funcs mtk_drm_fb_helper_funcs = {
> + .fb_probe = mtk_fbdev_probe,
> +};
> +
> +int mtk_fbdev_init(struct drm_device *dev)
drivers/gpu/drm/mediatek/mtk_drm_fbdev.c:128:5: warning: symbol 'mtk_fbdev_init' was not declared. Should it be static?
> +{
> + struct mtk_drm_private *priv = dev->dev_private;
> + struct drm_fb_helper *helper = &priv->fb_helper;
> + int ret;
> +
> + if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
> + return -EINVAL;
> +
> + drm_fb_helper_prepare(dev, helper, &mtk_drm_fb_helper_funcs);
> +
> + ret = drm_fb_helper_init(dev, helper,
> + dev->mode_config.num_connector);
> + if (ret) {
> + dev_err(dev->dev, "failed to initialize DRM FB helper, %d\n",
> + ret);
> + goto fini;
> + }
> +
> + ret = drm_fb_helper_single_add_all_connectors(helper);
> + if (ret) {
> + dev_err(dev->dev, "failed to add connectors, %d\n", ret);
> + goto fini;
> + }
> +
> + ret = drm_fb_helper_initial_config(helper, 32);
> + if (ret) {
> + dev_err(dev->dev, "failed to set initial configuration, %d\n",
> + ret);
> + goto fini;
> + }
> +
> + return 0;
> +
> +fini:
> + drm_fb_helper_fini(helper);
> +
> + return ret;
> +}
> +
> +void mtk_fbdev_fini(struct drm_device *dev)
drivers/gpu/drm/mediatek/mtk_drm_fbdev.c:168:6: warning: symbol 'mtk_fbdev_fini' was not declared. Should it be static?
> +{
> + struct mtk_drm_private *priv = dev->dev_private;
> + struct drm_fb_helper *helper = &priv->fb_helper;
> +
> + drm_fb_helper_unregister_fbi(helper);
> +
> + if (helper->fb) {
> + drm_framebuffer_unregister_private(helper->fb);
> + drm_framebuffer_remove(helper->fb);
> + }
> +
> + drm_fb_helper_fini(helper);
> +}
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_fbdev.h b/drivers/gpu/drm/mediatek/mtk_drm_fbdev.h
> new file mode 100644
> index 0000000..f3e0949
> --- /dev/null
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_fbdev.h
> @@ -0,0 +1,32 @@
> +/*
> + * Copyright (c) 2016 MediaTek Inc.
> + *
> + * 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.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef MTK_DRM_FBDEV_H
> +#define MTK_DRM_FBDEV_H
> +
> +#ifdef CONFIG_DRM_FBDEV_EMULATION
> +int mtk_fbdev_init(struct drm_device *dev);
> +void mtk_fbdev_fini(struct drm_device *dev);
> +#else
> +int mtk_fbdev_init(struct drm_device *dev)
[...]
> +void mtk_fbdev_fini(struct drm_device *dev)
These two should be static inline:
drivers/gpu/drm/mediatek/mtk_drm_fbdev.h:21:5: warning: symbol 'mtk_fbdev_init' was not declared. Should it be static?
drivers/gpu/drm/mediatek/mtk_drm_fbdev.h:26:6: warning: symbol 'mtk_fbdev_fini' was not declared. Should it be static?
regards
Philipp
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