diff options
Diffstat (limited to 'drivers/gpu/drm/tiny/st7586.c')
| -rw-r--r-- | drivers/gpu/drm/tiny/st7586.c | 407 |
1 files changed, 0 insertions, 407 deletions
diff --git a/drivers/gpu/drm/tiny/st7586.c b/drivers/gpu/drm/tiny/st7586.c deleted file mode 100644 index a29672d84ede..000000000000 --- a/drivers/gpu/drm/tiny/st7586.c +++ /dev/null @@ -1,407 +0,0 @@ -// 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/gpio/consumer.h> -#include <linux/module.h> -#include <linux/property.h> -#include <linux/spi/spi.h> -#include <video/mipi_display.h> - -#include <drm/clients/drm_client_setup.h> -#include <drm/drm_atomic_helper.h> -#include <drm/drm_damage_helper.h> -#include <drm/drm_drv.h> -#include <drm/drm_fb_dma_helper.h> -#include <drm/drm_fbdev_dma.h> -#include <drm/drm_format_helper.h> -#include <drm/drm_framebuffer.h> -#include <drm/drm_gem_atomic_helper.h> -#include <drm/drm_gem_dma_helper.h> -#include <drm/drm_gem_framebuffer_helper.h> -#include <drm/drm_managed.h> -#include <drm/drm_mipi_dbi.h> -#include <drm/drm_rect.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, - struct drm_format_conv_state *fmtcnv_state) -{ - size_t len = (clip->x2 - clip->x1) * (clip->y2 - clip->y1); - unsigned int x, y; - u8 *src, *buf, val; - struct iosys_map dst_map, vmap; - - buf = kmalloc(len, GFP_KERNEL); - if (!buf) - return; - - iosys_map_set_vaddr(&dst_map, buf); - iosys_map_set_vaddr(&vmap, vaddr); - drm_fb_xrgb8888_to_gray8(&dst_map, NULL, &vmap, fb, clip, fmtcnv_state); - 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 iosys_map *src, struct drm_framebuffer *fb, - struct drm_rect *clip, struct drm_format_conv_state *fmtcnv_state) -{ - int ret; - - ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); - if (ret) - return ret; - - st7586_xrgb8888_to_gray332(dst, src->vaddr, fb, clip, fmtcnv_state); - - drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE); - - return 0; -} - -static void st7586_fb_dirty(struct iosys_map *src, struct drm_framebuffer *fb, - struct drm_rect *rect, struct drm_format_conv_state *fmtcnv_state) -{ - struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(fb->dev); - struct mipi_dbi *dbi = &dbidev->dbi; - int start, end, ret = 0; - - /* 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, src, fb, rect, fmtcnv_state); - 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); -} - -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_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(state); - struct drm_framebuffer *fb = state->fb; - struct drm_rect rect; - int idx; - - if (!pipe->crtc.state->active) - return; - - if (!drm_dev_enter(fb->dev, &idx)) - return; - - if (drm_atomic_helper_damage_merged(old_state, state, &rect)) - st7586_fb_dirty(&shadow_plane_state->data[0], fb, &rect, - &shadow_plane_state->fmtcnv_state); - - drm_dev_exit(idx); -} - -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_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state); - 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_ROWS, 0x00, 0x00, 0x00, 0x77); - mipi_dbi_command(dbi, MIPI_DCS_EXIT_INVERT_MODE); - - msleep(100); - - st7586_fb_dirty(&shadow_plane_state->data[0], fb, &rect, - &shadow_plane_state->fmtcnv_state); - - 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"); - - mipi_dbi_command(&dbidev->dbi, MIPI_DCS_SET_DISPLAY_OFF); -} - -static const u32 st7586_formats[] = { - DRM_FORMAT_XRGB8888, -}; - -static const struct drm_simple_display_pipe_funcs st7586_pipe_funcs = { - .mode_valid = mipi_dbi_pipe_mode_valid, - .enable = st7586_pipe_enable, - .disable = st7586_pipe_disable, - .update = st7586_pipe_update, - .begin_fb_access = mipi_dbi_pipe_begin_fb_access, - .end_fb_access = mipi_dbi_pipe_end_fb_access, - .reset_plane = mipi_dbi_pipe_reset_plane, - .duplicate_plane_state = mipi_dbi_pipe_duplicate_plane_state, - .destroy_plane_state = mipi_dbi_pipe_destroy_plane_state, -}; - -static const struct drm_display_mode st7586_mode = { - DRM_SIMPLE_MODE(178, 128, 37, 27), -}; - -DEFINE_DRM_GEM_DMA_FOPS(st7586_fops); - -static const struct drm_driver st7586_driver = { - .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, - .fops = &st7586_fops, - DRM_GEM_DMA_DRIVER_OPS_VMAP, - DRM_FBDEV_DMA_DRIVER_OPS, - .debugfs_init = mipi_dbi_debugfs_init, - .name = "st7586", - .desc = "Sitronix ST7586", - .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 = devm_drm_dev_alloc(dev, &st7586_driver, - struct mipi_dbi_dev, drm); - if (IS_ERR(dbidev)) - return PTR_ERR(dbidev); - - dbi = &dbidev->dbi; - drm = &dbidev->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)) - return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n"); - - a0 = devm_gpiod_get(dev, "a0", GPIOD_OUT_LOW); - if (IS_ERR(a0)) - return dev_err_probe(dev, PTR_ERR(a0), "Failed to get GPIO 'a0'\n"); - - 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_client_setup(drm, NULL); - - return 0; -} - -static void st7586_remove(struct spi_device *spi) -{ - struct drm_device *drm = spi_get_drvdata(spi); - - drm_dev_unplug(drm); - drm_atomic_helper_shutdown(drm); -} - -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", - .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"); |