diff options
author | Geert Uytterhoeven <geert+renesas@glider.be> | 2020-01-15 13:45:47 +0100 |
---|---|---|
committer | Sam Ravnborg <sam@ravnborg.org> | 2020-01-19 18:07:30 +0100 |
commit | 98823f379447ad7691d427151e6f9c8761416052 (patch) | |
tree | 579efd3273fec93d538fba6b4e84dda6640d6ce3 | |
parent | f41a8a69890d08061076ee9e4e0e59c2f1e82477 (diff) |
drm: tiny: st7735r: Prepare for adding support for more displays
Currently the st7735r driver supports only a single display panel.
Prepare for adding support for other display panels by factoring out the
display-specific parameters in struct st7735r_cfg.
For now, the following parameters can be configured:
- Display resolution,
- Horizontal/vertical display offsets,
- Read-write versus read-only controllers,
- RGB versus BGR color component ordering.
Rename jd_t18003_t01_pipe_enable() and jd_t18003_t01_pipe_funcs() to
st7735r_pipe_enable() resp. st7735r_pipe_funcs(), as they are not really
specific to the Jianda JD-T18003-T01 display anymore.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200115124548.3951-5-geert+renesas@glider.be
-rw-r--r-- | drivers/gpu/drm/tiny/st7735r.c | 67 |
1 files changed, 53 insertions, 14 deletions
diff --git a/drivers/gpu/drm/tiny/st7735r.c b/drivers/gpu/drm/tiny/st7735r.c index 3f4487c71684..a838f237c8d8 100644 --- a/drivers/gpu/drm/tiny/st7735r.c +++ b/drivers/gpu/drm/tiny/st7735r.c @@ -3,6 +3,7 @@ * DRM driver for Sitronix ST7735R panels * * Copyright 2017 David Lechner <david@lechnology.com> + * Copyright (C) 2019 Glider bvba */ #include <linux/backlight.h> @@ -10,6 +11,7 @@ #include <linux/dma-buf.h> #include <linux/gpio/consumer.h> #include <linux/module.h> +#include <linux/of_device.h> #include <linux/property.h> #include <linux/spi/spi.h> #include <video/mipi_display.h> @@ -37,12 +39,28 @@ #define ST7735R_MY BIT(7) #define ST7735R_MX BIT(6) #define ST7735R_MV BIT(5) +#define ST7735R_RGB BIT(3) + +struct st7735r_cfg { + const struct drm_display_mode mode; + unsigned int left_offset; + unsigned int top_offset; + unsigned int write_only:1; + unsigned int rgb:1; /* RGB (vs. BGR) */ +}; + +struct st7735r_priv { + struct mipi_dbi_dev dbidev; /* Must be first for .release() */ + const struct st7735r_cfg *cfg; +}; -static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe, - struct drm_crtc_state *crtc_state, - struct drm_plane_state *plane_state) +static void st7735r_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 st7735r_priv *priv = container_of(dbidev, struct st7735r_priv, + dbidev); struct mipi_dbi *dbi = &dbidev->dbi; int ret, idx; u8 addr_mode; @@ -87,6 +105,10 @@ static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe, addr_mode = ST7735R_MY | ST7735R_MV; break; } + + if (priv->cfg->rgb) + addr_mode |= ST7735R_RGB; + mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode); mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT); @@ -109,15 +131,19 @@ out_exit: drm_dev_exit(idx); } -static const struct drm_simple_display_pipe_funcs jd_t18003_t01_pipe_funcs = { - .enable = jd_t18003_t01_pipe_enable, +static const struct drm_simple_display_pipe_funcs st7735r_pipe_funcs = { + .enable = st7735r_pipe_enable, .disable = mipi_dbi_pipe_disable, .update = mipi_dbi_pipe_update, .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb, }; -static const struct drm_display_mode jd_t18003_t01_mode = { - DRM_SIMPLE_MODE(128, 160, 28, 35), +static const struct st7735r_cfg jd_t18003_t01_cfg = { + .mode = { DRM_SIMPLE_MODE(128, 160, 28, 35) }, + /* Cannot read from Adafruit 1.8" display via SPI */ + .write_only = true, +}; + }; DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops); @@ -136,13 +162,13 @@ static struct drm_driver st7735r_driver = { }; static const struct of_device_id st7735r_of_match[] = { - { .compatible = "jianda,jd-t18003-t01" }, + { .compatible = "jianda,jd-t18003-t01", .data = &jd_t18003_t01_cfg }, { }, }; MODULE_DEVICE_TABLE(of, st7735r_of_match); static const struct spi_device_id st7735r_id[] = { - { "jd-t18003-t01", 0 }, + { "jd-t18003-t01", (uintptr_t)&jd_t18003_t01_cfg }, { }, }; MODULE_DEVICE_TABLE(spi, st7735r_id); @@ -150,17 +176,26 @@ MODULE_DEVICE_TABLE(spi, st7735r_id); static int st7735r_probe(struct spi_device *spi) { struct device *dev = &spi->dev; + const struct st7735r_cfg *cfg; struct mipi_dbi_dev *dbidev; + struct st7735r_priv *priv; struct drm_device *drm; struct mipi_dbi *dbi; struct gpio_desc *dc; u32 rotation = 0; int ret; - dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL); - if (!dbidev) + cfg = of_device_get_match_data(&spi->dev); + if (!cfg) + cfg = (void *)spi_get_device_id(spi)->driver_data; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) return -ENOMEM; + dbidev = &priv->dbidev; + priv->cfg = cfg; + dbi = &dbidev->dbi; drm = &dbidev->drm; ret = devm_drm_dev_init(dev, drm, &st7735r_driver); @@ -193,10 +228,14 @@ static int st7735r_probe(struct spi_device *spi) if (ret) return ret; - /* Cannot read from Adafruit 1.8" display via SPI */ - dbi->read_commands = NULL; + if (cfg->write_only) + dbi->read_commands = NULL; + + dbidev->left_offset = cfg->left_offset; + dbidev->top_offset = cfg->top_offset; - ret = mipi_dbi_dev_init(dbidev, &jd_t18003_t01_pipe_funcs, &jd_t18003_t01_mode, rotation); + ret = mipi_dbi_dev_init(dbidev, &st7735r_pipe_funcs, &cfg->mode, + rotation); if (ret) return ret; |