Introduce a DRM driver for the Mayqueen Pixpaper e-ink display panel, which is controlled via SPI. The driver supports a 122x250 resolution display with XRGB8888 format.
Also, add a MAINTAINERS entry for the Pixpaper driver. Signed-off-by: LiangCheng Wang <zaq14...@gmail.com> --- MAINTAINERS | 6 + drivers/gpu/drm/tiny/Kconfig | 15 + drivers/gpu/drm/tiny/Makefile | 1 + drivers/gpu/drm/tiny/pixpaper.c | 777 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 799 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index fad6cb025a1918beec113b576cf28b76151745ef..0613f32ef8a702e508c9a2e51853f8fe6a38ba42 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7756,6 +7756,12 @@ T: git https://gitlab.freedesktop.org/drm/misc/kernel.git F: Documentation/devicetree/bindings/display/repaper.txt F: drivers/gpu/drm/tiny/repaper.c +DRM DRIVER FOR PIXPAPER E-INK PANEL +M: LiangCheng Wang <zaq14...@gmail.com> +S: Maintained +F: Documentation/devicetree/bindings/display/mayqueen,pixpaper.yaml +F: drivers/gpu/drm/tiny/pixpaper.c + DRM DRIVER FOR QEMU'S CIRRUS DEVICE M: Dave Airlie <airl...@redhat.com> M: Gerd Hoffmann <kra...@redhat.com> diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig index 06e54694a7f2fe1649e1886f039926b24f698e0d..f9b814e87348cad1946dd5e2ff54d304100ef264 100644 --- a/drivers/gpu/drm/tiny/Kconfig +++ b/drivers/gpu/drm/tiny/Kconfig @@ -164,6 +164,21 @@ config TINYDRM_MI0283QT DRM driver for the Multi-Inno MI0283QT display panel If M is selected the module will be called mi0283qt. +config TINYDRM_PIXPAPER + tristate "DRM support for PIXPAPER display panels" + depends on DRM && SPI + select DRM_CLIENT_SELECTION + select DRM_KMS_HELPER + select DRM_GEM_DMA_HELPER + help + DRM driver for the Mayqueen Pixpaper e-ink display panel. + + This driver supports small e-paper displays connected over SPI, + with a resolution of 122x250 and XRGB8888 framebuffer format. + It is intended for low-power embedded applications. + + If M is selected, the module will be built as pixpaper.ko. + config TINYDRM_REPAPER tristate "DRM support for Pervasive Displays RePaper panels (V231)" depends on DRM && SPI diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile index 4a9ff61ec25420e2c0a648c04eaab7ca25dd5407..40d613b57f5ee990dbf170d69939a39546be21b7 100644 --- a/drivers/gpu/drm/tiny/Makefile +++ b/drivers/gpu/drm/tiny/Makefile @@ -12,5 +12,6 @@ obj-$(CONFIG_TINYDRM_ILI9225) += ili9225.o obj-$(CONFIG_TINYDRM_ILI9341) += ili9341.o obj-$(CONFIG_TINYDRM_ILI9486) += ili9486.o obj-$(CONFIG_TINYDRM_MI0283QT) += mi0283qt.o +obj-$(CONFIG_TINYDRM_PIXPAPER) += pixpaper.o obj-$(CONFIG_TINYDRM_REPAPER) += repaper.o obj-$(CONFIG_TINYDRM_SHARP_MEMORY) += sharp-memory.o diff --git a/drivers/gpu/drm/tiny/pixpaper.c b/drivers/gpu/drm/tiny/pixpaper.c new file mode 100644 index 0000000000000000000000000000000000000000..f134cacbb3d2b2792b94fc37cddb0b264348f192 --- /dev/null +++ b/drivers/gpu/drm/tiny/pixpaper.c @@ -0,0 +1,777 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * DRM driver for PIXPAPER e-ink panel + * + * Author: LiangCheng Wang <zaq14...@gmail.com>, + */ +#include <drm/clients/drm_client_setup.h> + +#include <drm/drm_atomic.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_drv.h> +#include <drm/drm_fbdev_dma.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_probe_helper.h> + +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/spi/spi.h> + +MODULE_IMPORT_NS("DMA_BUF"); + +#define PIXPAPER_WIDTH 122 +#define PIXPAPER_HEIGHT 250 + +#define PANEL_BUFFER_WIDTH 128 +#define PANEL_BUFFER_TWO_BYTES_PER_ROW (PANEL_BUFFER_WIDTH / 4) + +#define PIXPAPER_SPI_SPEED_DEFAULT 1000000 + +#define PIXPAPER_CMD_PANEL_SETTING 0x00 +#define PIXPAPER_CMD_POWER_SETTING 0x01 +#define PIXPAPER_CMD_POWER_OFF 0x02 +#define PIXPAPER_CMD_POWER_OFF_SEQUENCE 0x03 +#define PIXPAPER_CMD_POWER_ON 0x04 +#define PIXPAPER_CMD_BOOSTER_SOFT_START 0x06 +#define PIXPAPER_CMD_DEEP_SLEEP 0x07 +#define PIXPAPER_CMD_DATA_START_TRANSMISSION 0x10 +#define PIXPAPER_CMD_DISPLAY_REFRESH 0x12 +#define PIXPAPER_CMD_PLL_CONTROL 0x30 +#define PIXPAPER_CMD_TEMP_SENSOR_CALIB 0x41 +#define PIXPAPER_CMD_UNKNOWN_4D 0x4D +#define PIXPAPER_CMD_VCOM_INTERVAL 0x50 +#define PIXPAPER_CMD_TCON_SETTING 0x60 +#define PIXPAPER_CMD_RESOLUTION_SETTING 0x61 +#define PIXPAPER_CMD_GATE_SOURCE_START 0x65 +#define PIXPAPER_CMD_UNKNOWN_B4 0xB4 +#define PIXPAPER_CMD_UNKNOWN_B5 0xB5 +#define PIXPAPER_CMD_CASCADE_SETTING 0xE0 +#define PIXPAPER_CMD_POWER_SAVING 0xE3 +#define PIXPAPER_CMD_AUTO_MEASURE_VCOM 0xE7 +#define PIXPAPER_CMD_UNKNOWN_E9 0xE9 + +static int pixpaper_crtc_helper_atomic_check(struct drm_crtc *crtc, + struct drm_atomic_state *state); +static int pixpaper_plane_helper_atomic_check(struct drm_plane *plane, + struct drm_atomic_state *state); +static void pixpaper_crtc_atomic_enable(struct drm_crtc *crtc, + struct drm_atomic_state *state); +static void pixpaper_crtc_atomic_disable(struct drm_crtc *crtc, + struct drm_atomic_state *state); +static void pixpaper_plane_atomic_update(struct drm_plane *plane, + struct drm_atomic_state *state); +static int pixpaper_connector_get_modes(struct drm_connector *connector); + +struct pixpaper_panel { + struct drm_device drm; + struct drm_plane plane; + struct drm_crtc crtc; + struct drm_encoder encoder; + struct drm_connector connector; + + struct spi_device *spi; + struct gpio_desc *reset; + struct gpio_desc *busy; + struct gpio_desc *dc; +}; + +static const struct drm_plane_funcs pixpaper_plane_funcs = { + .update_plane = drm_atomic_helper_update_plane, + .disable_plane = drm_atomic_helper_disable_plane, + .destroy = drm_plane_cleanup, + DRM_GEM_SHADOW_PLANE_FUNCS, +}; + +static const struct drm_plane_helper_funcs pixpaper_plane_helper_funcs = { + DRM_GEM_SHADOW_PLANE_HELPER_FUNCS, + .atomic_check = pixpaper_plane_helper_atomic_check, + .atomic_update = pixpaper_plane_atomic_update, +}; + +static const struct drm_crtc_funcs pixpaper_crtc_funcs = { + .set_config = drm_atomic_helper_set_config, + .page_flip = drm_atomic_helper_page_flip, + .reset = drm_atomic_helper_crtc_reset, + .destroy = drm_crtc_cleanup, + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, +}; + +static const struct drm_crtc_helper_funcs pixpaper_crtc_helper_funcs = { + .atomic_check = pixpaper_crtc_helper_atomic_check, + .atomic_enable = pixpaper_crtc_atomic_enable, + .atomic_disable = pixpaper_crtc_atomic_disable, +}; + +static const struct drm_encoder_funcs pixpaper_encoder_funcs = { + .destroy = drm_encoder_cleanup, +}; + +static const struct drm_connector_funcs pixpaper_connector_funcs = { + .reset = drm_atomic_helper_connector_reset, + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = drm_connector_cleanup, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +static const struct drm_connector_helper_funcs pixpaper_connector_helper_funcs = { + .get_modes = pixpaper_connector_get_modes, +}; + +static int pixpaper_plane_helper_atomic_check(struct drm_plane *plane, + struct drm_atomic_state *state) +{ + struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane); + struct drm_crtc *new_crtc = new_plane_state->crtc; + struct drm_crtc_state *new_crtc_state = NULL; + int ret; + + if (new_crtc) + new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc); + + ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state, + DRM_PLANE_NO_SCALING, + DRM_PLANE_NO_SCALING, + false, false); + if (ret) + return ret; + else if (!new_plane_state->visible) + return 0; + + return 0; +} + +static int pixpaper_crtc_helper_atomic_check(struct drm_crtc *crtc, + struct drm_atomic_state *state) +{ + struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc); + + if (!crtc_state->enable) + return 0; + + return drm_atomic_helper_check_crtc_primary_plane(crtc_state); +} + +static void pixpaper_wait_busy(struct pixpaper_panel *panel) +{ + unsigned int delay_us = 1000; + + usleep_range(delay_us, delay_us + 500); + while (true) + if (gpiod_get_value_cansleep(panel->busy) == 1) + break; +} + +static int pixpaper_spi_sync(struct spi_device *spi, struct spi_message *msg) +{ + int ret; + + ret = spi_sync(spi, msg); + if (ret < 0) + dev_err(&spi->dev, "SPI sync failed: %d\n", ret); + + return ret; +} + +static int pixpaper_send_cmd(struct pixpaper_panel *panel, u8 cmd) +{ + struct spi_transfer xfer = { + .tx_buf = &cmd, + .len = 1, + }; + struct spi_message msg; + int ret; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + + gpiod_set_value_cansleep(panel->dc, 0); + usleep_range(1, 5); + ret = pixpaper_spi_sync(panel->spi, &msg); + + return ret; +} + +static int pixpaper_send_data(struct pixpaper_panel *panel, u8 data) +{ + struct spi_transfer xfer = { + .tx_buf = &data, + .len = 1, + }; + struct spi_message msg; + int ret; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + + gpiod_set_value_cansleep(panel->dc, 1); + usleep_range(1, 5); + ret = pixpaper_spi_sync(panel->spi, &msg); + + return ret; +} + +static int pixpaper_panel_hw_init(struct pixpaper_panel *panel) +{ + struct device *dev = &panel->spi->dev; + int ret = 0; + + dev_info(dev, "%s: Starting hardware initialization\n", __func__); + + gpiod_set_value_cansleep(panel->reset, 0); + msleep(50); + gpiod_set_value_cansleep(panel->reset, 1); + msleep(50); + + pixpaper_wait_busy(panel); + dev_info(dev, "Hardware reset complete, panel idle.\n"); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_4D); + ret |= pixpaper_send_data(panel, 0x78); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_PANEL_SETTING); + ret |= pixpaper_send_data(panel, 0x0F); + ret |= pixpaper_send_data(panel, 0x09); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SETTING); + ret |= pixpaper_send_data(panel, 0x07); + ret |= pixpaper_send_data(panel, 0x00); + ret |= pixpaper_send_data(panel, 0x22); + ret |= pixpaper_send_data(panel, 0x78); + ret |= pixpaper_send_data(panel, 0x0A); + ret |= pixpaper_send_data(panel, 0x22); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_OFF_SEQUENCE); + ret |= pixpaper_send_data(panel, 0x10); + ret |= pixpaper_send_data(panel, 0x54); + ret |= pixpaper_send_data(panel, 0x44); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_BOOSTER_SOFT_START); + ret |= pixpaper_send_data(panel, 0x0F); + ret |= pixpaper_send_data(panel, 0x0A); + ret |= pixpaper_send_data(panel, 0x2F); + ret |= pixpaper_send_data(panel, 0x25); + ret |= pixpaper_send_data(panel, 0x22); + ret |= pixpaper_send_data(panel, 0x2E); + ret |= pixpaper_send_data(panel, 0x21); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_PLL_CONTROL); + ret |= pixpaper_send_data(panel, 0x02); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_TEMP_SENSOR_CALIB); + ret |= pixpaper_send_data(panel, 0x00); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_VCOM_INTERVAL); + ret |= pixpaper_send_data(panel, 0x37); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_TCON_SETTING); + ret |= pixpaper_send_data(panel, 0x02); + ret |= pixpaper_send_data(panel, 0x02); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_RESOLUTION_SETTING); + ret |= pixpaper_send_data(panel, 0x00); + ret |= pixpaper_send_data(panel, 0x80); + ret |= pixpaper_send_data(panel, 0x00); + ret |= pixpaper_send_data(panel, 0xFA); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_GATE_SOURCE_START); + ret |= pixpaper_send_data(panel, 0x00); + ret |= pixpaper_send_data(panel, 0x00); + ret |= pixpaper_send_data(panel, 0x00); + ret |= pixpaper_send_data(panel, 0x00); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_AUTO_MEASURE_VCOM); + ret |= pixpaper_send_data(panel, 0x1C); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_SAVING); + ret |= pixpaper_send_data(panel, 0x22); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_CASCADE_SETTING); + ret |= pixpaper_send_data(panel, 0x00); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B4); + ret |= pixpaper_send_data(panel, 0xD0); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_B5); + ret |= pixpaper_send_data(panel, 0x03); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + ret |= pixpaper_send_cmd(panel, PIXPAPER_CMD_UNKNOWN_E9); + ret |= pixpaper_send_data(panel, 0x01); + if (ret) + goto init_fail; + pixpaper_wait_busy(panel); + + dev_info(dev, "%s: Hardware initialization successful\n", __func__); + return 0; + +init_fail: + dev_err(dev, "%s: Hardware initialization failed (err=%d)\n", __func__, + ret); + return ret; +} + +static void pixpaper_crtc_atomic_enable(struct drm_crtc *crtc, + struct drm_atomic_state *state) +{ + struct pixpaper_panel *panel = + container_of(crtc, struct pixpaper_panel, crtc); + struct drm_device *drm = &panel->drm; + int ret; + + dev_info(drm->dev, "%s: Enabling pipe\n", __func__); + + ret = pixpaper_panel_hw_init(panel); + if (ret) { + dev_err(drm->dev, "Panel HW Init failed during enable: %d\n", + ret); + return; + } + + dev_info(drm->dev, "Sending Power ON (PON)\n"); + ret = pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_ON); + if (ret) { + dev_err(drm->dev, "Failed to send PON command: %d\n", ret); + return; + } + + usleep_range(10000, 11000); + + pixpaper_wait_busy(panel); + + dev_info(drm->dev, "Panel enabled and powered on\n"); +} + +static void pixpaper_crtc_atomic_disable(struct drm_crtc *crtc, + struct drm_atomic_state *state) +{ + struct pixpaper_panel *panel = + container_of(crtc, struct pixpaper_panel, crtc); + struct drm_device *drm = &panel->drm; + int ret; + + dev_dbg(drm->dev, "%s: Disabling pipe\n", __func__); + + ret = pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_OFF); + if (!ret) { + usleep_range(10000, 11000); + pixpaper_wait_busy(panel); + } else { + dev_warn(drm->dev, "Failed to send POF command: %d\n", ret); + } + dev_info(drm->dev, "Panel disabled\n"); +} + +static u8 pack_pixels_to_byte(u32 *src_pixels, int i, int j, + struct drm_framebuffer *fb) +{ + u8 packed_byte = 0; + int k; + + for (k = 0; k < 4; k++) { + int current_pixel_x = j * 4 + k; + u8 two_bit_val; + + if (current_pixel_x < PIXPAPER_WIDTH) { + u32 pixel_offset = + (i * (fb->pitches[0] / 4)) + current_pixel_x; + u32 pixel = src_pixels[pixel_offset]; + u32 r = (pixel >> 16) & 0xFF; + u32 g = (pixel >> 8) & 0xFF; + u32 b = pixel & 0xFF; + u32 gray_val = + (r * 299 + g * 587 + b * 114 + 500) / 1000; + + if (gray_val < 64) + two_bit_val = 0b00; + else if (gray_val < 128) + two_bit_val = 0b01; + else if (gray_val < 192) + two_bit_val = 0b10; + else + two_bit_val = 0b11; + } else { + two_bit_val = 0b11; + } + + packed_byte |= two_bit_val << ((3 - k) * 2); + } + + return packed_byte; +} + +static void pixpaper_plane_atomic_update(struct drm_plane *plane, + struct drm_atomic_state *state) +{ + struct drm_plane_state *plane_state = + drm_atomic_get_new_plane_state(state, plane); + struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state); + struct drm_crtc *crtc = plane_state->crtc; + struct pixpaper_panel *panel = + container_of(crtc, struct pixpaper_panel, crtc); + + struct drm_device *drm = &panel->drm; + struct drm_framebuffer *fb = plane_state->fb; + struct iosys_map map = shadow_plane_state->data[0]; + void *vaddr = map.vaddr; + int i, j, ret = 0; + u32 *src_pixels = NULL; + + dev_info(drm->dev, "Starting frame update (phys=%dx%d, buf_w=%d)\n", + PIXPAPER_WIDTH, PIXPAPER_HEIGHT, PANEL_BUFFER_WIDTH); + + if (!fb || !plane_state->visible) { + dev_err(drm->dev, + "No framebuffer or plane not visible, skipping update\n"); + return; + } + + if (ret) { + dev_err(drm->dev, "Failed to vmap dma_buf\n"); + return; + } + + src_pixels = (u32 *)vaddr; + + dev_info(drm->dev, "Sending DTM command\n"); + ret = pixpaper_send_cmd(panel, PIXPAPER_CMD_DATA_START_TRANSMISSION); + if (ret) + goto update_cleanup; + + usleep_range(10000, 11000); + pixpaper_wait_busy(panel); + + dev_info(drm->dev, + "Panel idle after DTM command, starting data batch send.\n"); + + for (i = 0; i < PIXPAPER_HEIGHT; i++) { + for (j = 0; j < PANEL_BUFFER_TWO_BYTES_PER_ROW; j++) { + u8 packed_byte = + pack_pixels_to_byte(src_pixels, i, j, fb); + + pixpaper_wait_busy(panel); + pixpaper_send_data(panel, packed_byte); + } + } + pixpaper_wait_busy(panel); + + dev_info(drm->dev, "Sending PON + 0x00 before DRF\n"); + ret = pixpaper_send_cmd(panel, PIXPAPER_CMD_POWER_ON); + if (ret) + goto update_cleanup; + ret = pixpaper_send_data(panel, 0x00); + if (ret) { + dev_err(drm->dev, + "Failed sending data after PON-before-DRF: %d\n", ret); + goto update_cleanup; + } + usleep_range(10000, 11000); + pixpaper_wait_busy(panel); + + dev_info(drm->dev, "Triggering display refresh (DRF)\n"); + ret = pixpaper_send_cmd(panel, PIXPAPER_CMD_DISPLAY_REFRESH); + if (ret) + goto update_cleanup; + ret = pixpaper_send_data(panel, 0x00); + if (ret) { + dev_err(drm->dev, "Failed sending data after DRF: %d\n", ret); + goto update_cleanup; + } + usleep_range(10000, 11000); + pixpaper_wait_busy(panel); + + dev_info(drm->dev, "Frame update completed and refresh triggered\n"); + +update_cleanup: + if (ret && ret != -ETIMEDOUT) + dev_err(drm->dev, + "Frame update function failed with error %d\n", ret); +} + +static int pixpaper_connector_get_modes(struct drm_connector *connector) +{ + struct drm_display_mode *mode; + + dev_info(connector->dev->dev, "%s: CALLED for connector %s (id: %d)\n", + __func__, connector->name, connector->base.id); + + mode = drm_mode_create(connector->dev); + if (!mode) { + DRM_ERROR("Failed to create mode for connector %s\n", + connector->name); + return 0; + } + + mode->hdisplay = PIXPAPER_WIDTH; + mode->vdisplay = PIXPAPER_HEIGHT; + + mode->htotal = mode->hdisplay + 80; + mode->hsync_start = mode->hdisplay + 8; + mode->hsync_end = mode->hdisplay + 8 + 32; + mode->vtotal = mode->vdisplay + 10; + mode->vsync_start = mode->vdisplay + 2; + mode->vsync_end = mode->vdisplay + 2 + 2; + + mode->clock = 6000; + + mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; + drm_mode_set_name(mode); + + if (drm_mode_validate_size(mode, connector->dev->mode_config.max_width, + connector->dev->mode_config.max_height) != + MODE_OK) { + DRM_WARN("%s: Mode %s (%dx%d) failed size validation against max %dx%d\n", + __func__, mode->name, mode->hdisplay, mode->vdisplay, + connector->dev->mode_config.max_width, + connector->dev->mode_config.max_height); + drm_mode_destroy(connector->dev, mode); + return 0; + } + + drm_mode_probed_add(connector, mode); + dev_info(connector->dev->dev, + "%s: Added mode '%s' (%dx%d@%d) to connector %s\n", __func__, + mode->name, mode->hdisplay, mode->vdisplay, + drm_mode_vrefresh(mode), connector->name); + + connector->display_info.width_mm = 30; + connector->display_info.height_mm = 47; + + return 1; +} + +DEFINE_DRM_GEM_DMA_FOPS(pixpaper_fops); + +static struct drm_driver pixpaper_drm_driver = { + .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, + .fops = &pixpaper_fops, + .name = "pixpaper", + .desc = "DRM driver for PIXPAPER e-ink", + .major = 1, + .minor = 0, + DRM_GEM_DMA_DRIVER_OPS_VMAP, + DRM_FBDEV_DMA_DRIVER_OPS, +}; + +static int pixpaper_mode_valid(struct drm_device *dev, + const struct drm_display_mode *mode) +{ + if (mode->hdisplay == PIXPAPER_WIDTH && + mode->vdisplay == PIXPAPER_HEIGHT) { + return MODE_OK; + } + dev_dbg(dev->dev, "Rejecting mode %dx%d (supports only %dx%d)\n", + mode->hdisplay, mode->vdisplay, PIXPAPER_WIDTH, + PIXPAPER_HEIGHT); + return MODE_BAD; +} + +static const struct drm_mode_config_funcs pixpaper_mode_config_funcs = { + .fb_create = drm_gem_fb_create_with_dirty, + .mode_valid = pixpaper_mode_valid, + .atomic_check = drm_atomic_helper_check, + .atomic_commit = drm_atomic_helper_commit, +}; + +static int pixpaper_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct pixpaper_panel *panel; + struct drm_device *drm; + int ret; + + dev_info(dev, "Probing PIXPAPER panel driver\n"); + + panel = devm_drm_dev_alloc(dev, &pixpaper_drm_driver, + struct pixpaper_panel, drm); + if (IS_ERR(panel)) { + ret = PTR_ERR(panel); + dev_err(dev, "Failed to allocate DRM device: %d\n", ret); + return ret; + } + drm = &panel->drm; + panel->spi = spi; + spi_set_drvdata(spi, panel); + + spi->mode = SPI_MODE_0; + spi->bits_per_word = 8; + + if (!spi->max_speed_hz) { + dev_warn(dev, "spi-max-frequency not specified in DT, using default %u Hz\n", + PIXPAPER_SPI_SPEED_DEFAULT); + spi->max_speed_hz = PIXPAPER_SPI_SPEED_DEFAULT; + } else { + dev_info(dev, "Using spi-max-frequency from DT: %u Hz\n", + spi->max_speed_hz); + } + + ret = spi_setup(spi); + if (ret < 0) { + dev_err(dev, "SPI setup failed: %d\n", ret); + return ret; + } + dev_info(dev, "SPI setup OK (mode=%d, speed=%u Hz, bpw=%d)\n", + spi->mode, spi->max_speed_hz, spi->bits_per_word); + + if (!dev->dma_mask) + dev->dma_mask = &dev->coherent_dma_mask; + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); + if (ret) { + dev_err(dev, "Failed to set DMA mask: %d\n", ret); + return ret; + } + dev_dbg(dev, "DMA mask set\n"); + + panel->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(panel->reset)) + return dev_err_probe(dev, PTR_ERR(panel->reset), + "Failed to get 'reset' GPIO\n"); + panel->busy = devm_gpiod_get(dev, "busy", GPIOD_IN); + if (IS_ERR(panel->busy)) + return dev_err_probe(dev, PTR_ERR(panel->busy), + "Failed to get 'busy' GPIO\n"); + panel->dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_HIGH); + if (IS_ERR(panel->dc)) + return dev_err_probe(dev, PTR_ERR(panel->dc), + "Failed to get 'dc' GPIO\n"); + dev_info(dev, "All required GPIOs obtained successfully.\n"); + + ret = drmm_mode_config_init(drm); + if (ret) + return ret; + drm->mode_config.funcs = &pixpaper_mode_config_funcs; + drm->mode_config.min_width = PIXPAPER_WIDTH; + drm->mode_config.max_width = PIXPAPER_WIDTH; + drm->mode_config.min_height = PIXPAPER_HEIGHT; + drm->mode_config.max_height = PIXPAPER_HEIGHT; + + ret = drm_universal_plane_init(drm, &panel->plane, 1, &pixpaper_plane_funcs, + (const uint32_t[]){ DRM_FORMAT_XRGB8888 }, 1, NULL, + DRM_PLANE_TYPE_PRIMARY, NULL); + drm_plane_enable_fb_damage_clips(&panel->plane); + if (ret) + return ret; + drm_plane_helper_add(&panel->plane, &pixpaper_plane_helper_funcs); + + ret = drm_crtc_init_with_planes(drm, &panel->crtc, &panel->plane, NULL, + &pixpaper_crtc_funcs, NULL); + if (ret) + return ret; + drm_crtc_helper_add(&panel->crtc, &pixpaper_crtc_helper_funcs); + + ret = drm_encoder_init(drm, &panel->encoder, &pixpaper_encoder_funcs, + DRM_MODE_ENCODER_DAC, NULL); + if (ret) + return ret; + panel->encoder.possible_crtcs = drm_crtc_mask(&panel->crtc); + + ret = drm_connector_init(drm, &panel->connector, + &pixpaper_connector_funcs, + DRM_MODE_CONNECTOR_SPI); + if (ret) + return ret; + + drm_connector_helper_add(&panel->connector, + &pixpaper_connector_helper_funcs); + drm_connector_attach_encoder(&panel->connector, &panel->encoder); + + drm_mode_config_reset(drm); + + ret = drm_dev_register(drm, 0); + if (ret) + return ret; + + drm_client_setup(drm, NULL); + + dev_info(dev, "Initialized PIXPAPER panel driver successfully\n"); + return 0; +} + +static void pixpaper_remove(struct spi_device *spi) +{ + struct pixpaper_panel *panel = spi_get_drvdata(spi); + + if (!panel) + return; + + dev_info(&spi->dev, "Removing PIXPAPER panel driver\n"); + + drm_dev_unplug(&panel->drm); + drm_atomic_helper_shutdown(&panel->drm); +} + +static const struct spi_device_id pixpaper_ids[] = { { "pixpaper", 0 }, {} }; +MODULE_DEVICE_TABLE(spi, pixpaper_ids); + +static const struct of_device_id pixpaper_dt_ids[] = { + { .compatible = "mayqueen,pixpaper" }, + {} +}; +MODULE_DEVICE_TABLE(of, pixpaper_dt_ids); + +static struct spi_driver pixpaper_spi_driver = { + .driver = { + .name = "pixpaper", + .of_match_table = pixpaper_dt_ids, + }, + .id_table = pixpaper_ids, + .probe = pixpaper_probe, + .remove = pixpaper_remove, +}; + +module_spi_driver(pixpaper_spi_driver); + +MODULE_AUTHOR("LiangCheng Wang"); +MODULE_DESCRIPTION("DRM SPI driver for PIXPAPER e-ink panel"); +MODULE_LICENSE("GPL"); -- 2.34.1
