| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * DRM driver for display panels connected to a Sitronix ST7715R or ST7735R |
| * display controller in SPI mode. |
| * |
| * Copyright 2017 David Lechner <david@lechnology.com> |
| * Copyright (C) 2019 Glider bvba |
| */ |
| |
| #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 ST7735R_FRMCTR1 0xb1 |
| #define ST7735R_FRMCTR2 0xb2 |
| #define ST7735R_FRMCTR3 0xb3 |
| #define ST7735R_INVCTR 0xb4 |
| #define ST7735R_PWCTR1 0xc0 |
| #define ST7735R_PWCTR2 0xc1 |
| #define ST7735R_PWCTR3 0xc2 |
| #define ST7735R_PWCTR4 0xc3 |
| #define ST7735R_PWCTR5 0xc4 |
| #define ST7735R_VMCTR1 0xc5 |
| #define ST7735R_GAMCTRP1 0xe0 |
| #define ST7735R_GAMCTRN1 0xe1 |
| |
| #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 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; |
| |
| if (!drm_dev_enter(pipe->crtc.dev, &idx)) |
| return; |
| |
| DRM_DEBUG_KMS("\n"); |
| |
| ret = mipi_dbi_poweron_reset(dbidev); |
| if (ret) |
| goto out_exit; |
| |
| msleep(150); |
| |
| mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE); |
| msleep(500); |
| |
| mipi_dbi_command(dbi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d); |
| mipi_dbi_command(dbi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d); |
| mipi_dbi_command(dbi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c, |
| 0x2d); |
| mipi_dbi_command(dbi, ST7735R_INVCTR, 0x07); |
| mipi_dbi_command(dbi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84); |
| mipi_dbi_command(dbi, ST7735R_PWCTR2, 0xc5); |
| mipi_dbi_command(dbi, ST7735R_PWCTR3, 0x0a, 0x00); |
| mipi_dbi_command(dbi, ST7735R_PWCTR4, 0x8a, 0x2a); |
| mipi_dbi_command(dbi, ST7735R_PWCTR5, 0x8a, 0xee); |
| mipi_dbi_command(dbi, ST7735R_VMCTR1, 0x0e); |
| mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE); |
| switch (dbidev->rotation) { |
| default: |
| addr_mode = ST7735R_MX | ST7735R_MY; |
| break; |
| case 90: |
| addr_mode = ST7735R_MX | ST7735R_MV; |
| break; |
| case 180: |
| addr_mode = 0; |
| break; |
| case 270: |
| 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); |
| mipi_dbi_command(dbi, ST7735R_GAMCTRP1, 0x02, 0x1c, 0x07, 0x12, 0x37, |
| 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2b, 0x39, 0x00, 0x01, |
| 0x03, 0x10); |
| mipi_dbi_command(dbi, ST7735R_GAMCTRN1, 0x03, 0x1d, 0x07, 0x06, 0x2e, |
| 0x2c, 0x29, 0x2d, 0x2e, 0x2e, 0x37, 0x3f, 0x00, 0x00, |
| 0x02, 0x10); |
| mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON); |
| |
| msleep(100); |
| |
| mipi_dbi_command(dbi, MIPI_DCS_ENTER_NORMAL_MODE); |
| |
| msleep(20); |
| |
| mipi_dbi_enable_flush(dbidev, crtc_state, plane_state); |
| out_exit: |
| drm_dev_exit(idx); |
| } |
| |
| 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, |
| }; |
| |
| 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, |
| }; |
| |
| static const struct st7735r_cfg rh128128t_cfg = { |
| .mode = { DRM_SIMPLE_MODE(128, 128, 25, 26) }, |
| .left_offset = 2, |
| .top_offset = 3, |
| .rgb = true, |
| }; |
| |
| DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops); |
| |
| static const struct drm_driver st7735r_driver = { |
| .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, |
| .fops = &st7735r_fops, |
| DRM_GEM_CMA_DRIVER_OPS_VMAP, |
| .debugfs_init = mipi_dbi_debugfs_init, |
| .name = "st7735r", |
| .desc = "Sitronix ST7735R", |
| .date = "20171128", |
| .major = 1, |
| .minor = 0, |
| }; |
| |
| static const struct of_device_id st7735r_of_match[] = { |
| { .compatible = "jianda,jd-t18003-t01", .data = &jd_t18003_t01_cfg }, |
| { .compatible = "okaya,rh128128t", .data = &rh128128t_cfg }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, st7735r_of_match); |
| |
| static const struct spi_device_id st7735r_id[] = { |
| { "jd-t18003-t01", (uintptr_t)&jd_t18003_t01_cfg }, |
| { }, |
| }; |
| 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; |
| |
| cfg = device_get_match_data(&spi->dev); |
| if (!cfg) |
| cfg = (void *)spi_get_device_id(spi)->driver_data; |
| |
| priv = devm_drm_dev_alloc(dev, &st7735r_driver, |
| struct st7735r_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 GPIO 'reset'\n"); |
| |
| dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW); |
| if (IS_ERR(dc)) |
| return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\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; |
| |
| dbidev->left_offset = cfg->left_offset; |
| dbidev->top_offset = cfg->top_offset; |
| |
| ret = mipi_dbi_dev_init(dbidev, &st7735r_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 void st7735r_remove(struct spi_device *spi) |
| { |
| struct drm_device *drm = spi_get_drvdata(spi); |
| |
| drm_dev_unplug(drm); |
| drm_atomic_helper_shutdown(drm); |
| } |
| |
| static void st7735r_shutdown(struct spi_device *spi) |
| { |
| drm_atomic_helper_shutdown(spi_get_drvdata(spi)); |
| } |
| |
| static struct spi_driver st7735r_spi_driver = { |
| .driver = { |
| .name = "st7735r", |
| .of_match_table = st7735r_of_match, |
| }, |
| .id_table = st7735r_id, |
| .probe = st7735r_probe, |
| .remove = st7735r_remove, |
| .shutdown = st7735r_shutdown, |
| }; |
| module_spi_driver(st7735r_spi_driver); |
| |
| MODULE_DESCRIPTION("Sitronix ST7735R DRM driver"); |
| MODULE_AUTHOR("David Lechner <david@lechnology.com>"); |
| MODULE_LICENSE("GPL"); |