在 2021-08-02星期一的 14:35 +0800，Icenowy Zheng写道：
> Add a driver for generic MIPI DBI panels initialized with MIPI DCS
> commands.
>
> Currently a ST7789V-based panel is added to it. This panel has its
> configuration pre-programmed into the controller, so no vendor-
> specific
> configuration is needed.
>
> Signed-off-by: Icenowy Zheng <icenowy@xxxxxxxxxx>
> ---
> drivers/gpu/drm/tiny/Kconfig | 12 ++
> drivers/gpu/drm/tiny/Makefile | 1 +
> drivers/gpu/drm/tiny/simple-dbi.c | 244
> ++++++++++++++++++++++++++++++
> 3 files changed, 257 insertions(+)
> create mode 100644 drivers/gpu/drm/tiny/simple-dbi.c
>
> diff --git a/drivers/gpu/drm/tiny/Kconfig
> b/drivers/gpu/drm/tiny/Kconfig
> index d31be274a2bd..6cfc57b68a46 100644
> --- a/drivers/gpu/drm/tiny/Kconfig
> +++ b/drivers/gpu/drm/tiny/Kconfig
> @@ -144,6 +144,18 @@ config TINYDRM_REPAPER
>
> If M is selected the module will be called repaper.
>
> +config TINYDRM_SIMPLE_DBI
> + tristate "DRM support for generic MIPI DBI panels"
> + depends on DRM && SPI
> + select DRM_KMS_HELPER
> + select DRM_KMS_CMA_HELPER
> + select DRM_MIPI_DBI
> + help
> + DRM driver for generic DBI panels that are MIPI DCS
> compatible
> + and needs no vendor-specific setup commands.
> +
> + If M is selected the module will be called simple-dbi.
> +
> config TINYDRM_ST7586
> tristate "DRM support for Sitronix ST7586 display panels"
> depends on DRM && SPI
> diff --git a/drivers/gpu/drm/tiny/Makefile
> b/drivers/gpu/drm/tiny/Makefile
> index e09942895c77..2553de651aa3 100644
> --- a/drivers/gpu/drm/tiny/Makefile
> +++ b/drivers/gpu/drm/tiny/Makefile
> @@ -13,3 +13,4 @@ obj-$(CONFIG_TINYDRM_MI0283QT) +=
> mi0283qt.o
> obj-$(CONFIG_TINYDRM_REPAPER) += repaper.o
> obj-$(CONFIG_TINYDRM_ST7586) += st7586.o
> obj-$(CONFIG_TINYDRM_ST7735R) += st7735r.o
> +obj-$(CONFIG_TINYDRM_SIMPLE_DBI) += simple-dbi.o
> diff --git a/drivers/gpu/drm/tiny/simple-dbi.c
> b/drivers/gpu/drm/tiny/simple-dbi.c
> new file mode 100644
> index 000000000000..2b207e43d500
> --- /dev/null
> +++ b/drivers/gpu/drm/tiny/simple-dbi.c
> @@ -0,0 +1,244 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * DRM driver for display panels with configuration preset and needs
> only
> + * standard MIPI DCS commands to bring up.
> + *
> + * Copyright (C) 2021 Sipeed
> + */
> +
> +#include <linux/backlight.h>
> +#include <linux/delay.h>
> +#include <linux/dma-buf.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/property.h>
> +#include <linux/spi/spi.h>
> +#include <video/mipi_display.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_gem_atomic_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_managed.h>
> +#include <drm/drm_mipi_dbi.h>
> +
> +#define MIPI_DCS_ADDRESS_MODE_BGR BIT(3)
> +#define MIPI_DCS_ADDRESS_MODE_REVERSE BIT(5)
> +#define MIPI_DCS_ADDRESS_MODE_RTL BIT(6)
> +#define MIPI_DCS_ADDRESS_MODE_BTT BIT(7)
> +
> +struct simple_dbi_cfg {
> + const struct drm_display_mode mode;
> + unsigned int left_offset;
> + unsigned int top_offset;
> + bool inverted;
> + bool write_only;
> + bool bgr;
> + bool right_to_left;
> + bool bottom_to_top;
> +};
> +
> +struct simple_dbi_priv {
> + struct mipi_dbi_dev dbidev; /* Must be first for
> .release() */
> + const struct simple_dbi_cfg *cfg;
> +};
> +
> +static void simple_dbi_pipe_enable(struct drm_simple_display_pipe
> *pipe,
> + struct drm_crtc_state *crtc_state,
> + struct drm_plane_state *plane_state)
> +{
> + struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe-
> >crtc.dev);
> + struct simple_dbi_priv *priv = container_of(dbidev,
> + struct
> simple_dbi_priv,
> + dbidev);
> + struct mipi_dbi *dbi = &dbidev->dbi;
> + int ret, idx;
> + u8 addr_mode = 0x00;
> +
> + if (!drm_dev_enter(pipe->crtc.dev, &idx))
> + return;
> +
> + DRM_DEBUG_KMS("\n");
> +
> + ret = mipi_dbi_poweron_reset(dbidev);
> + if (ret)
> + goto out_exit;
> +
> + mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
> + msleep(5);
> +
> + /* Currently tinydrm supports 16bit only now */
> + mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
> + MIPI_DCS_PIXEL_FMT_16BIT);
> +
> + if (priv->cfg->inverted)
> + mipi_dbi_command(dbi, MIPI_DCS_ENTER_INVERT_MODE);
> + else
> + mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE);
> +
> + if (priv->cfg->bgr)
> + addr_mode |= MIPI_DCS_ADDRESS_MODE_BGR;
> +
> + if (priv->cfg->right_to_left)
> + addr_mode |= MIPI_DCS_ADDRESS_MODE_RTL;
> +
> + if (priv->cfg->bottom_to_top)
> + addr_mode |= MIPI_DCS_ADDRESS_MODE_BTT;
> +
> + switch (dbidev->rotation) {
> + default:
> + break;
> + case 90:
> + addr_mode ^= MIPI_DCS_ADDRESS_MODE_REVERSE;
> + addr_mode ^= MIPI_DCS_ADDRESS_MODE_RTL;
> + break;
> + case 180:
> + addr_mode ^= MIPI_DCS_ADDRESS_MODE_RTL;
> + addr_mode ^= MIPI_DCS_ADDRESS_MODE_BTT;
> + break;
> + case 270:
> + addr_mode ^= MIPI_DCS_ADDRESS_MODE_REVERSE;
> + addr_mode ^= MIPI_DCS_ADDRESS_MODE_BTT;
> + break;
> + }
> +
> + mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
> +
> + mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE);
> +
> + mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
> +
> + mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
> +out_exit:
> + drm_dev_exit(idx);
> +}
> +
> +static const struct drm_simple_display_pipe_funcs
> simple_dbi_pipe_funcs = {
> + .enable = simple_dbi_pipe_enable,
> + .disable = mipi_dbi_pipe_disable,
> + .update = mipi_dbi_pipe_update,
> + .prepare_fb = drm_gem_simple_display_pipe_prepare_fb,
> +};
> +
> +static const struct simple_dbi_cfg zsx154_b1206_cfg = {
> + .mode = { DRM_SIMPLE_MODE(240, 240, 28, 28) },
> + .inverted = true,
> + .write_only = true,
> +};
> +
> +DEFINE_DRM_GEM_CMA_FOPS(simple_dbi_fops);
> +
> +static const struct drm_driver simple_dbi_driver = {
> + .driver_features = DRIVER_GEM | DRIVER_MODESET |
> DRIVER_ATOMIC,
> + .fops = &simple_dbi_fops,
> + DRM_GEM_CMA_DRIVER_OPS_VMAP,
> + .debugfs_init = mipi_dbi_debugfs_init,
> + .name = "simple-dbi",
> + .desc = "Generic MIPI-DCS compatible DBI
> panel",
> + .date = "20210723",
> + .major = 1,
> + .minor = 0,
> +};
> +
> +static const struct of_device_id simple_dbi_of_match[] = {
> + { .compatible = "zsx,zsx154-b1206", .data = &zsx154_b1206_cfg
> },
> + { },
> +}
Oops, a missing semicolon here.
Thanks for CI robot to find out this.
> +MODULE_DEVICE_TABLE(of, simple_dbi_of_match);
> +
> +static int simple_dbi_probe(struct spi_device *spi)
> +{
> + struct device *dev = &spi->dev;
> + const struct simple_dbi_cfg *cfg;
> + struct mipi_dbi_dev *dbidev;
> + struct simple_dbi_priv *priv;
> + struct drm_device *drm;
> + struct mipi_dbi *dbi;
> + struct gpio_desc *dc;
> + u32 rotation = 0;
> + int ret;
> +
> + cfg = device_get_match_data(&spi->dev);
> + if (!cfg)
> + cfg = (void *)spi_get_device_id(spi)->driver_data;
> +
> + priv = devm_drm_dev_alloc(dev, &simple_dbi_driver,
> + struct simple_dbi_priv,
> dbidev.drm);
> + if (IS_ERR(priv))
> + return PTR_ERR(priv);
> +
> + dbidev = &priv->dbidev;
> + priv->cfg = cfg;
> +
> + dbi = &dbidev->dbi;
> + drm = &dbidev->drm;
> +
> + dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(dbi->reset))
> + return dev_err_probe(dev, PTR_ERR(dbi->reset),
> "Failed to get reset GPIO\n");
> +
> + dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
> + if (IS_ERR(dc))
> + return dev_err_probe(dev, PTR_ERR(dc), "Failed to get
> D/C GPIO\n");
> +
> + dbidev->backlight = devm_of_find_backlight(dev);
> + if (IS_ERR(dbidev->backlight))
> + return PTR_ERR(dbidev->backlight);
> +
> + device_property_read_u32(dev, "rotation", &rotation);
> +
> + ret = mipi_dbi_spi_init(spi, dbi, dc);
> + if (ret)
> + return ret;
> +
> + if (cfg->write_only)
> + dbi->read_commands = NULL;
> +
> + ret = mipi_dbi_dev_init(dbidev, &simple_dbi_pipe_funcs, &cfg-
> >mode,
> + rotation);
> + if (ret)
> + return ret;
> +
> + drm_mode_config_reset(drm);
> +
> + ret = drm_dev_register(drm, 0);
> + if (ret)
> + return ret;
> +
> + spi_set_drvdata(spi, drm);
> +
> + drm_fbdev_generic_setup(drm, 0);
> +
> + return 0;
> +}
> +
> +static int simple_dbi_remove(struct spi_device *spi)
> +{
> + struct drm_device *drm = spi_get_drvdata(spi);
> +
> + drm_dev_unplug(drm);
> + drm_atomic_helper_shutdown(drm);
> +
> + return 0;
> +}
> +
> +static void simple_dbi_shutdown(struct spi_device *spi)
> +{
> + drm_atomic_helper_shutdown(spi_get_drvdata(spi));
> +}
> +
> +static struct spi_driver simple_dbi_spi_driver = {
> + .driver = {
> + .name = "simple-dbi",
> + .of_match_table = simple_dbi_of_match,
> + },
> + .probe = simple_dbi_probe,
> + .remove = simple_dbi_remove,
> + .shutdown = simple_dbi_shutdown,
> +};
> +module_spi_driver(simple_dbi_spi_driver);
> +
> +MODULE_DESCRIPTION("Simple DBI panel DRM driver");
> +MODULE_AUTHOR("Icenowy Zheng <icenowy@xxxxxxx>");
> +MODULE_LICENSE("GPL");
