Hi Am 02.08.21 um 08:35 schrieb Icenowy Zheng:
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_REPAPERIf 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() */
Which 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");
I'm not a friend of such debugging statements. If you absolutely want to keep it, rather use drm_dbg_kms().
+
+ 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 },
+ { },
+}
+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);
AFAIK dev files are being created during drm_dev_register(). It's probably safer to set the drvdata before.
+
+ 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");
Trailing blank line. (?) Best regards Thomas -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Felix Imendörffer
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