| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| David Lechner | 1730 | 97.14% | 1 | 8.33% |
| Noralf Trönnes | 25 | 1.40% | 6 | 50.00% |
| Ville Syrjälä | 22 | 1.24% | 2 | 16.67% |
| Harsha Sharma | 2 | 0.11% | 1 | 8.33% |
| Colin Ian King | 1 | 0.06% | 1 | 8.33% |
| Daniel Vetter | 1 | 0.06% | 1 | 8.33% |
| Total | 1781 | 12 |
/* * DRM driver for Sitronix ST7586 panels * * Copyright 2017 David Lechner <david@lechnology.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #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_fb_cma_helper.h> #include <drm/drm_gem_cma_helper.h> #include <drm/drm_gem_framebuffer_helper.h> #include <drm/tinydrm/mipi-dbi.h> #include <drm/tinydrm/tinydrm-helpers.h> /* controller-specific commands */ #define ST7586_DISP_MODE_GRAY 0x38 #define ST7586_DISP_MODE_MONO 0x39 #define ST7586_ENABLE_DDRAM 0x3a #define ST7586_SET_DISP_DUTY 0xb0 #define ST7586_SET_PART_DISP 0xb4 #define ST7586_SET_NLINE_INV 0xb5 #define ST7586_SET_VOP 0xc0 #define ST7586_SET_BIAS_SYSTEM 0xc3 #define ST7586_SET_BOOST_LEVEL 0xc4 #define ST7586_SET_VOP_OFFSET 0xc7 #define ST7586_ENABLE_ANALOG 0xd0 #define ST7586_AUTO_READ_CTRL 0xd7 #define ST7586_OTP_RW_CTRL 0xe0 #define ST7586_OTP_CTRL_OUT 0xe1 #define ST7586_OTP_READ 0xe3 #define ST7586_DISP_CTRL_MX BIT(6) #define ST7586_DISP_CTRL_MY BIT(7) /* * The ST7586 controller has an unusual pixel format where 2bpp grayscale is * packed 3 pixels per byte with the first two pixels using 3 bits and the 3rd * pixel using only 2 bits. * * | D7 | D6 | D5 || | || 2bpp | * | (D4) | (D3) | (D2) || D1 | D0 || GRAY | * +------+------+------++------+------++------+ * | 1 | 1 | 1 || 1 | 1 || 0 0 | black * | 1 | 0 | 0 || 1 | 0 || 0 1 | dark gray * | 0 | 1 | 0 || 0 | 1 || 1 0 | light gray * | 0 | 0 | 0 || 0 | 0 || 1 1 | white */ static const u8 st7586_lookup[] = { 0x7, 0x4, 0x2, 0x0 }; static void st7586_xrgb8888_to_gray332(u8 *dst, void *vaddr, struct drm_framebuffer *fb, struct drm_clip_rect *clip) { size_t len = (clip->x2 - clip->x1) * (clip->y2 - clip->y1); unsigned int x, y; u8 *src, *buf, val; buf = kmalloc(len, GFP_KERNEL); if (!buf) return; tinydrm_xrgb8888_to_gray8(buf, vaddr, fb, clip); src = buf; for (y = clip->y1; y < clip->y2; y++) { for (x = clip->x1; x < clip->x2; x += 3) { val = st7586_lookup[*src++ >> 6] << 5; val |= st7586_lookup[*src++ >> 6] << 2; val |= st7586_lookup[*src++ >> 6] >> 1; *dst++ = val; } } kfree(buf); } static int st7586_buf_copy(void *dst, struct drm_framebuffer *fb, struct drm_clip_rect *clip) { struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0); struct dma_buf_attachment *import_attach = cma_obj->base.import_attach; void *src = cma_obj->vaddr; int ret = 0; if (import_attach) { ret = dma_buf_begin_cpu_access(import_attach->dmabuf, DMA_FROM_DEVICE); if (ret) return ret; } st7586_xrgb8888_to_gray332(dst, src, fb, clip); if (import_attach) ret = dma_buf_end_cpu_access(import_attach->dmabuf, DMA_FROM_DEVICE); return ret; } static int st7586_fb_dirty(struct drm_framebuffer *fb, struct drm_file *file_priv, unsigned int flags, unsigned int color, struct drm_clip_rect *clips, unsigned int num_clips) { struct tinydrm_device *tdev = fb->dev->dev_private; struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev); struct drm_clip_rect clip; int start, end; int ret = 0; if (!mipi->enabled) return 0; tinydrm_merge_clips(&clip, clips, num_clips, flags, fb->width, fb->height); /* 3 pixels per byte, so grow clip to nearest multiple of 3 */ clip.x1 = rounddown(clip.x1, 3); clip.x2 = roundup(clip.x2, 3); DRM_DEBUG("Flushing [FB:%d] x1=%u, x2=%u, y1=%u, y2=%u\n", fb->base.id, clip.x1, clip.x2, clip.y1, clip.y2); ret = st7586_buf_copy(mipi->tx_buf, fb, &clip); if (ret) return ret; /* Pixels are packed 3 per byte */ start = clip.x1 / 3; end = clip.x2 / 3; mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS, (start >> 8) & 0xFF, start & 0xFF, (end >> 8) & 0xFF, (end - 1) & 0xFF); mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS, (clip.y1 >> 8) & 0xFF, clip.y1 & 0xFF, (clip.y2 >> 8) & 0xFF, (clip.y2 - 1) & 0xFF); ret = mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START, (u8 *)mipi->tx_buf, (end - start) * (clip.y2 - clip.y1)); return ret; } static const struct drm_framebuffer_funcs st7586_fb_funcs = { .destroy = drm_gem_fb_destroy, .create_handle = drm_gem_fb_create_handle, .dirty = tinydrm_fb_dirty, }; static void st7586_pipe_enable(struct drm_simple_display_pipe *pipe, struct drm_crtc_state *crtc_state, struct drm_plane_state *plane_state) { struct tinydrm_device *tdev = pipe_to_tinydrm(pipe); struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev); int ret; u8 addr_mode; DRM_DEBUG_KMS("\n"); ret = mipi_dbi_poweron_reset(mipi); if (ret) return; mipi_dbi_command(mipi, ST7586_AUTO_READ_CTRL, 0x9f); mipi_dbi_command(mipi, ST7586_OTP_RW_CTRL, 0x00); msleep(10); mipi_dbi_command(mipi, ST7586_OTP_READ); msleep(20); mipi_dbi_command(mipi, ST7586_OTP_CTRL_OUT); mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE); mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF); msleep(50); mipi_dbi_command(mipi, ST7586_SET_VOP_OFFSET, 0x00); mipi_dbi_command(mipi, ST7586_SET_VOP, 0xe3, 0x00); mipi_dbi_command(mipi, ST7586_SET_BIAS_SYSTEM, 0x02); mipi_dbi_command(mipi, ST7586_SET_BOOST_LEVEL, 0x04); mipi_dbi_command(mipi, ST7586_ENABLE_ANALOG, 0x1d); mipi_dbi_command(mipi, ST7586_SET_NLINE_INV, 0x00); mipi_dbi_command(mipi, ST7586_DISP_MODE_GRAY); mipi_dbi_command(mipi, ST7586_ENABLE_DDRAM, 0x02); switch (mipi->rotation) { default: addr_mode = 0x00; break; case 90: addr_mode = ST7586_DISP_CTRL_MY; break; case 180: addr_mode = ST7586_DISP_CTRL_MX | ST7586_DISP_CTRL_MY; break; case 270: addr_mode = ST7586_DISP_CTRL_MX; break; } mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode); mipi_dbi_command(mipi, ST7586_SET_DISP_DUTY, 0x7f); mipi_dbi_command(mipi, ST7586_SET_PART_DISP, 0xa0); mipi_dbi_command(mipi, MIPI_DCS_SET_PARTIAL_AREA, 0x00, 0x00, 0x00, 0x77); mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE); msleep(100); mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON); mipi_dbi_enable_flush(mipi, crtc_state, plane_state); } static void st7586_pipe_disable(struct drm_simple_display_pipe *pipe) { struct tinydrm_device *tdev = pipe_to_tinydrm(pipe); struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev); DRM_DEBUG_KMS("\n"); if (!mipi->enabled) return; mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF); mipi->enabled = false; } static const u32 st7586_formats[] = { DRM_FORMAT_XRGB8888, }; static int st7586_init(struct device *dev, struct mipi_dbi *mipi, const struct drm_simple_display_pipe_funcs *pipe_funcs, struct drm_driver *driver, const struct drm_display_mode *mode, unsigned int rotation) { size_t bufsize = (mode->vdisplay + 2) / 3 * mode->hdisplay; struct tinydrm_device *tdev = &mipi->tinydrm; int ret; mutex_init(&mipi->cmdlock); mipi->tx_buf = devm_kmalloc(dev, bufsize, GFP_KERNEL); if (!mipi->tx_buf) return -ENOMEM; ret = devm_tinydrm_init(dev, tdev, &st7586_fb_funcs, driver); if (ret) return ret; tdev->fb_dirty = st7586_fb_dirty; ret = tinydrm_display_pipe_init(tdev, pipe_funcs, DRM_MODE_CONNECTOR_VIRTUAL, st7586_formats, ARRAY_SIZE(st7586_formats), mode, rotation); if (ret) return ret; tdev->drm->mode_config.preferred_depth = 32; mipi->rotation = rotation; drm_mode_config_reset(tdev->drm); DRM_DEBUG_KMS("preferred_depth=%u, rotation = %u\n", tdev->drm->mode_config.preferred_depth, rotation); return 0; } static const struct drm_simple_display_pipe_funcs st7586_pipe_funcs = { .enable = st7586_pipe_enable, .disable = st7586_pipe_disable, .update = tinydrm_display_pipe_update, .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb, }; static const struct drm_display_mode st7586_mode = { TINYDRM_MODE(178, 128, 37, 27), }; DEFINE_DRM_GEM_CMA_FOPS(st7586_fops); static struct drm_driver st7586_driver = { .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC, .fops = &st7586_fops, DRM_GEM_CMA_VMAP_DRIVER_OPS, .debugfs_init = mipi_dbi_debugfs_init, .name = "st7586", .desc = "Sitronix ST7586", .date = "20170801", .major = 1, .minor = 0, }; static const struct of_device_id st7586_of_match[] = { { .compatible = "lego,ev3-lcd" }, {}, }; MODULE_DEVICE_TABLE(of, st7586_of_match); static const struct spi_device_id st7586_id[] = { { "ev3-lcd", 0 }, { }, }; MODULE_DEVICE_TABLE(spi, st7586_id); static int st7586_probe(struct spi_device *spi) { struct device *dev = &spi->dev; struct mipi_dbi *mipi; struct gpio_desc *a0; u32 rotation = 0; int ret; mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL); if (!mipi) return -ENOMEM; mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); if (IS_ERR(mipi->reset)) { DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n"); return PTR_ERR(mipi->reset); } a0 = devm_gpiod_get(dev, "a0", GPIOD_OUT_LOW); if (IS_ERR(a0)) { DRM_DEV_ERROR(dev, "Failed to get gpio 'a0'\n"); return PTR_ERR(a0); } device_property_read_u32(dev, "rotation", &rotation); ret = mipi_dbi_spi_init(spi, mipi, a0); if (ret) return ret; /* Cannot read from this controller via SPI */ mipi->read_commands = NULL; /* * we are using 8-bit data, so we are not actually swapping anything, * but setting mipi->swap_bytes makes mipi_dbi_typec3_command() do the * right thing and not use 16-bit transfers (which results in swapped * bytes on little-endian systems and causes out of order data to be * sent to the display). */ mipi->swap_bytes = true; ret = st7586_init(&spi->dev, mipi, &st7586_pipe_funcs, &st7586_driver, &st7586_mode, rotation); if (ret) return ret; spi_set_drvdata(spi, mipi); return devm_tinydrm_register(&mipi->tinydrm); } static void st7586_shutdown(struct spi_device *spi) { struct mipi_dbi *mipi = spi_get_drvdata(spi); tinydrm_shutdown(&mipi->tinydrm); } static struct spi_driver st7586_spi_driver = { .driver = { .name = "st7586", .owner = THIS_MODULE, .of_match_table = st7586_of_match, }, .id_table = st7586_id, .probe = st7586_probe, .shutdown = st7586_shutdown, }; module_spi_driver(st7586_spi_driver); MODULE_DESCRIPTION("Sitronix ST7586 DRM driver"); MODULE_AUTHOR("David Lechner <david@lechnology.com>"); MODULE_LICENSE("GPL");
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