| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| David Lechner | 1302 | 69.37% | 1 | 3.70% |
| Noralf Trönnes | 556 | 29.62% | 18 | 66.67% |
| Ville Syrjälä | 6 | 0.32% | 2 | 7.41% |
| Gerd Hoffmann | 4 | 0.21% | 1 | 3.70% |
| Sam Ravnborg | 3 | 0.16% | 1 | 3.70% |
| Harsha Sharma | 2 | 0.11% | 1 | 3.70% |
| Thomas Gleixner | 2 | 0.11% | 1 | 3.70% |
| Daniel Vetter | 1 | 0.05% | 1 | 3.70% |
| Colin Ian King | 1 | 0.05% | 1 | 3.70% |
| Total | 1877 | 27 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * DRM driver for Sitronix ST7586 panels * * Copyright 2017 David Lechner <david@lechnology.com> */ #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_damage_helper.h> #include <drm/drm_drv.h> #include <drm/drm_fb_cma_helper.h> #include <drm/drm_fb_helper.h> #include <drm/drm_format_helper.h> #include <drm/drm_gem_cma_helper.h> #include <drm/drm_gem_framebuffer_helper.h> #include <drm/drm_mipi_dbi.h> #include <drm/drm_rect.h> #include <drm/drm_vblank.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_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; drm_fb_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_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 void st7586_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect) { struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(fb->dev); struct mipi_dbi *dbi = &dbidev->dbi; int start, end, idx, ret = 0; if (!dbidev->enabled) return; if (!drm_dev_enter(fb->dev, &idx)) return; /* 3 pixels per byte, so grow clip to nearest multiple of 3 */ rect->x1 = rounddown(rect->x1, 3); rect->x2 = roundup(rect->x2, 3); DRM_DEBUG_KMS("Flushing [FB:%d] " DRM_RECT_FMT "\n", fb->base.id, DRM_RECT_ARG(rect)); ret = st7586_buf_copy(dbidev->tx_buf, fb, rect); if (ret) goto err_msg; /* Pixels are packed 3 per byte */ start = rect->x1 / 3; end = rect->x2 / 3; mipi_dbi_command(dbi, MIPI_DCS_SET_COLUMN_ADDRESS, (start >> 8) & 0xFF, start & 0xFF, (end >> 8) & 0xFF, (end - 1) & 0xFF); mipi_dbi_command(dbi, MIPI_DCS_SET_PAGE_ADDRESS, (rect->y1 >> 8) & 0xFF, rect->y1 & 0xFF, (rect->y2 >> 8) & 0xFF, (rect->y2 - 1) & 0xFF); ret = mipi_dbi_command_buf(dbi, MIPI_DCS_WRITE_MEMORY_START, (u8 *)dbidev->tx_buf, (end - start) * (rect->y2 - rect->y1)); err_msg: if (ret) dev_err_once(fb->dev->dev, "Failed to update display %d\n", ret); drm_dev_exit(idx); } static void st7586_pipe_update(struct drm_simple_display_pipe *pipe, struct drm_plane_state *old_state) { struct drm_plane_state *state = pipe->plane.state; struct drm_crtc *crtc = &pipe->crtc; struct drm_rect rect; if (drm_atomic_helper_damage_merged(old_state, state, &rect)) st7586_fb_dirty(state->fb, &rect); if (crtc->state->event) { spin_lock_irq(&crtc->dev->event_lock); drm_crtc_send_vblank_event(crtc, crtc->state->event); spin_unlock_irq(&crtc->dev->event_lock); crtc->state->event = NULL; } } static void st7586_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 drm_framebuffer *fb = plane_state->fb; struct mipi_dbi *dbi = &dbidev->dbi; struct drm_rect rect = { .x1 = 0, .x2 = fb->width, .y1 = 0, .y2 = fb->height, }; int idx, ret; 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; mipi_dbi_command(dbi, ST7586_AUTO_READ_CTRL, 0x9f); mipi_dbi_command(dbi, ST7586_OTP_RW_CTRL, 0x00); msleep(10); mipi_dbi_command(dbi, ST7586_OTP_READ); msleep(20); mipi_dbi_command(dbi, ST7586_OTP_CTRL_OUT); mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE); mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF); msleep(50); mipi_dbi_command(dbi, ST7586_SET_VOP_OFFSET, 0x00); mipi_dbi_command(dbi, ST7586_SET_VOP, 0xe3, 0x00); mipi_dbi_command(dbi, ST7586_SET_BIAS_SYSTEM, 0x02); mipi_dbi_command(dbi, ST7586_SET_BOOST_LEVEL, 0x04); mipi_dbi_command(dbi, ST7586_ENABLE_ANALOG, 0x1d); mipi_dbi_command(dbi, ST7586_SET_NLINE_INV, 0x00); mipi_dbi_command(dbi, ST7586_DISP_MODE_GRAY); mipi_dbi_command(dbi, ST7586_ENABLE_DDRAM, 0x02); switch (dbidev->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(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode); mipi_dbi_command(dbi, ST7586_SET_DISP_DUTY, 0x7f); mipi_dbi_command(dbi, ST7586_SET_PART_DISP, 0xa0); mipi_dbi_command(dbi, MIPI_DCS_SET_PARTIAL_AREA, 0x00, 0x00, 0x00, 0x77); mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE); msleep(100); dbidev->enabled = true; st7586_fb_dirty(fb, &rect); mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON); out_exit: drm_dev_exit(idx); } static void st7586_pipe_disable(struct drm_simple_display_pipe *pipe) { struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev); /* * This callback is not protected by drm_dev_enter/exit since we want to * turn off the display on regular driver unload. It's highly unlikely * that the underlying SPI controller is gone should this be called after * unplug. */ DRM_DEBUG_KMS("\n"); if (!dbidev->enabled) return; mipi_dbi_command(&dbidev->dbi, MIPI_DCS_SET_DISPLAY_OFF); dbidev->enabled = false; } static const u32 st7586_formats[] = { DRM_FORMAT_XRGB8888, }; static const struct drm_simple_display_pipe_funcs st7586_pipe_funcs = { .enable = st7586_pipe_enable, .disable = st7586_pipe_disable, .update = st7586_pipe_update, .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb, }; static const struct drm_display_mode st7586_mode = { DRM_SIMPLE_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_ATOMIC, .fops = &st7586_fops, .release = mipi_dbi_release, 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_dev *dbidev; struct drm_device *drm; struct mipi_dbi *dbi; struct gpio_desc *a0; u32 rotation = 0; size_t bufsize; int ret; dbidev = kzalloc(sizeof(*dbidev), GFP_KERNEL); if (!dbidev) return -ENOMEM; dbi = &dbidev->dbi; drm = &dbidev->drm; ret = devm_drm_dev_init(dev, drm, &st7586_driver); if (ret) { kfree(dbidev); return ret; } drm_mode_config_init(drm); bufsize = (st7586_mode.vdisplay + 2) / 3 * st7586_mode.hdisplay; dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); if (IS_ERR(dbi->reset)) { DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n"); return PTR_ERR(dbi->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, dbi, a0); if (ret) return ret; /* Cannot read from this controller via SPI */ dbi->read_commands = NULL; ret = mipi_dbi_dev_init_with_formats(dbidev, &st7586_pipe_funcs, st7586_formats, ARRAY_SIZE(st7586_formats), &st7586_mode, rotation, bufsize); if (ret) return ret; /* * 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). */ dbi->swap_bytes = true; 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 int st7586_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 st7586_shutdown(struct spi_device *spi) { drm_atomic_helper_shutdown(spi_get_drvdata(spi)); } 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, .remove = st7586_remove, .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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