diff options
Diffstat (limited to 'drivers/gpu/drm/tinydrm/st7586.c')
| -rw-r--r-- | drivers/gpu/drm/tinydrm/st7586.c | 401 |
1 files changed, 0 insertions, 401 deletions
diff --git a/drivers/gpu/drm/tinydrm/st7586.c b/drivers/gpu/drm/tinydrm/st7586.c deleted file mode 100644 index a6a8a1081b73..000000000000 --- a/drivers/gpu/drm/tinydrm/st7586.c +++ /dev/null @@ -1,401 +0,0 @@ -/* - * 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"); |