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

diff --git a/drivers/gpu/drm/tiny/st7735r.c b/drivers/gpu/drm/tiny/st7735r.c
index 3f4487c..a838f23 100644 (file)
--- 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;