Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/gpu/drm/tiny/st7586.c b/drivers/gpu/drm/tiny/st7586.c
new file mode 100644
index 0000000..3cc21a1
--- /dev/null
+++ b/drivers/gpu/drm/tiny/st7586.c
@@ -0,0 +1,424 @@
+// 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");