Hi, thanks for the patches. Am 29.11.23 um 15:29 schrieb Mehdi Djait:
Introduce a DRM driver for the sharp LS027B7DH01 Memory LCD. LS027B7DH01 is a 2.7" 400x240 monochrome display connected to a SPI bus. The drivers implements the Multiple Lines Data Update Mode. External COM inversion is enabled using a PWM signal as input. Signed-off-by: Mehdi Djait <mehdi.djait@xxxxxxxxxxx> --- MAINTAINERS | 7 + drivers/gpu/drm/tiny/Kconfig | 8 + drivers/gpu/drm/tiny/Makefile | 1 + drivers/gpu/drm/tiny/sharp-ls027b7dh01.c | 411 +++++++++++++++++++++++ 4 files changed, 427 insertions(+) create mode 100644 drivers/gpu/drm/tiny/sharp-ls027b7dh01.c diff --git a/MAINTAINERS b/MAINTAINERS index 012df8ccf34e..fb859698bd3d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6832,6 +6832,13 @@ S: Maintained F: Documentation/devicetree/bindings/display/panel/samsung,s6d7aa0.yaml F: drivers/gpu/drm/panel/panel-samsung-s6d7aa0.c+DRM DRIVER FOR SHARP LS027B7DH01 Memory LCD+M: Mehdi Djait <mehdi.djait@xxxxxxxxxxx> +S: Maintained +T: git git://anongit.freedesktop.org/drm/drm-misc +F: Documentation/devicetree/bindings/display/sharp,ls027b7dh01.yaml +F: drivers/gpu/drm/tiny/sharp-ls027b7dh01.c + DRM DRIVER FOR SITRONIX ST7586 PANELS M: David Lechner <david@xxxxxxxxxxxxxx> S: Maintained diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig index f6889f649bc1..a2ade06403ca 100644 --- a/drivers/gpu/drm/tiny/Kconfig +++ b/drivers/gpu/drm/tiny/Kconfig @@ -186,6 +186,14 @@ config TINYDRM_REPAPERIf M is selected the module will be called repaper. +config TINYDRM_SHARP_LS027B7DH01+ tristate "DRM support for SHARP LS027B7DH01 display" + depends on DRM && SPI + select DRM_KMS_HELPER + select DRM_GEM_DMA_HELPER + help + DRM driver for the SHARP LS027B7DD01 LCD display. + config TINYDRM_ST7586 tristate "DRM support for Sitronix ST7586 display panels" depends on DRM && SPI diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile index 76dde89a044b..b05df3afb231 100644 --- a/drivers/gpu/drm/tiny/Makefile +++ b/drivers/gpu/drm/tiny/Makefile @@ -14,5 +14,6 @@ obj-$(CONFIG_TINYDRM_ILI9341) += ili9341.o obj-$(CONFIG_TINYDRM_ILI9486) += ili9486.o obj-$(CONFIG_TINYDRM_MI0283QT) += mi0283qt.o obj-$(CONFIG_TINYDRM_REPAPER) += repaper.o +obj-$(CONFIG_TINYDRM_SHARP_LS027B7DH01) += sharp-ls027b7dh01.o obj-$(CONFIG_TINYDRM_ST7586) += st7586.o obj-$(CONFIG_TINYDRM_ST7735R) += st7735r.o diff --git a/drivers/gpu/drm/tiny/sharp-ls027b7dh01.c b/drivers/gpu/drm/tiny/sharp-ls027b7dh01.c new file mode 100644 index 000000000000..2f58865a5c78 --- /dev/null +++ b/drivers/gpu/drm/tiny/sharp-ls027b7dh01.c @@ -0,0 +1,411 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Sharp LS027B7DH01 Memory Display Driver + * + * Copyright (C) 2023 Andrew D'Angelo + * Copyright (C) 2023 Mehdi Djait <mehdi.djait@xxxxxxxxxxx> + * + * The Sharp Memory LCD requires an alternating signal to prevent the buildup of + * a DC bias that would result in a Display that no longer can be updated. Two + * modes for the generation of this signal are supported: + * + * Software, EXTMODE = Low: toggling the BIT(1) of the Command and writing it at + * least once a second to the display. + * + * Hardware, EXTMODE = High: the alternating signal should be supplied on the + * EXTCOMIN pin. + * + * In this driver the Hardware mode is implemented with a PWM signal. + */ + +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/pwm.h> +#include <linux/spi/spi.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_damage_helper.h> +#include <drm/drm_drv.h> +#include <drm/drm_fbdev_generic.h> +#include <drm/drm_fb_dma_helper.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_modes.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_simple_kms_helper.h> + +#define CMD_WRITE BIT(0) +#define CMD_CLEAR BIT(2) + +struct sharp_ls027b7dh01 { + struct spi_device *spi; + + struct drm_device drm; + struct drm_connector connector; + struct drm_simple_display_pipe pipe;
Could you please replace the simple pipe and its helpers with regular DRMhelpers. It should no tbe used in new drivers. It's an unnecessary indirection. Replacing is simple: copy the content of the data structure and its helpers into the driver. Maybe clean up the result, if necessary.
Best regards Thomas
+ const struct drm_display_mode *display_mode;
+
+ struct gpio_desc *enable_gpio;
+ struct pwm_device *extcomin_pwm;
+
+ u8 *write_buf;
+};
+
+static inline struct sharp_ls027b7dh01 *drm_to_priv(struct drm_device *drm)
+{
+ return container_of(drm, struct sharp_ls027b7dh01, drm);
+}
+
+/**
+ * sharp_ls027b7dh01_add_headers - Add the Sharp LS027B7DH01 specific headers
+ * @write_buf: Buffer to write
+ * @clip: DRM clip rectangle area to write
+ * @dst_pitch: Pitch of the write buffer
+ *
+ * This function adds the SHARP LS027B7DH01 specific headers to the buffer for
+ * the Multiple Lines Write Mode:
+ * - The first byte will contain the write command.
+ * - Every line data starts with the line number and ends with a dummy zero
+ * trailer byte. It should be noted here that the line numbers are indexed
+ * from 1.
+ *
+ * Returns the size of the buffer to write to the display.
+ */
+static size_t sharp_ls027b7dh01_add_headers(u8 *write_buf,
+ const struct drm_rect *clip,
+ const unsigned int dst_pitch)
+{
+ u8 line_num = clip->y1 + 1;
+ unsigned int lines = drm_rect_height(clip);
+ unsigned int y;
+
+ write_buf[0] = CMD_WRITE;
+ write_buf[1] = line_num++;
+
+ for (y = 1; y < lines; y++) {
+ write_buf[y * dst_pitch] = 0;
+ write_buf[y * dst_pitch + 1] = line_num++;
+ }
+
+ write_buf[lines * dst_pitch] = 0;
+ write_buf[lines * dst_pitch + 1] = 0;
+
+ return lines * dst_pitch + 2;
+}
+
+static int sharp_ls027b7dh01_prepare_buf(struct sharp_ls027b7dh01 *priv,
+ u8 *write_buf,
+ size_t *data_len,
+ struct drm_framebuffer *fb,
+ const struct drm_rect *clip)
+{
+ struct drm_gem_dma_object *dma_obj;
+ struct iosys_map dst, vmap;
+ unsigned int dst_pitch;
+ int ret;
+
+ /* Leave 2 bytes to hold the line number and the trailer dummy byte. */
+ dst_pitch = (drm_rect_width(clip) / 8) + 2;
+
+ dma_obj = drm_fb_dma_get_gem_obj(fb, 0);
+
+ ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
+ if (ret)
+ return ret;
+
+ iosys_map_set_vaddr(&dst, &write_buf[2]);
+ iosys_map_set_vaddr(&vmap, dma_obj->vaddr);
+
+ drm_fb_xrgb8888_to_mono(&dst, &dst_pitch, &vmap, fb, clip);
+
+ drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
+
+ *data_len = sharp_ls027b7dh01_add_headers(write_buf, clip, dst_pitch);
+
+ return 0;
+}
+
+static int sharp_ls027b7dh01_fb_damaged(struct drm_framebuffer *fb,
+ const struct drm_rect *rect)
+{
+ struct drm_rect clip;
+ struct sharp_ls027b7dh01 *priv;
+ size_t data_len;
+ int drm_index;
+ int ret;
+
+ clip.x1 = 0;
+ clip.x2 = fb->width;
+ clip.y1 = rect->y1;
+ clip.y2 = rect->y2;
+
+ priv = drm_to_priv(fb->dev);
+
+ if (!drm_dev_enter(fb->dev, &drm_index))
+ return -ENODEV;
+
+ ret = sharp_ls027b7dh01_prepare_buf(priv, priv->write_buf, &data_len, fb, &clip);
+ if (ret)
+ goto exit;
+
+ ret = spi_write(priv->spi, priv->write_buf, data_len);
+
+exit:
+ drm_dev_exit(drm_index);
+
+ return ret;
+}
+
+static void sharp_ls027b7dh01_pipe_update(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *old_state)
+{
+ struct drm_plane_state *state = pipe->plane.state;
+ struct drm_rect rect;
+
+ if (!pipe->crtc.state->active)
+ return;
+
+ if (drm_atomic_helper_damage_merged(old_state, state, &rect))
+ sharp_ls027b7dh01_fb_damaged(state->fb, &rect);
+}
+
+static void sharp_ls027b7dh01_pipe_disable(struct drm_simple_display_pipe *pipe)
+{
+ struct sharp_ls027b7dh01 *priv;
+
+ priv = drm_to_priv(pipe->crtc.dev);
+ gpiod_set_value(priv->enable_gpio, 0);
+}
+
+static int sharp_ls027b7dh01_clear_display(struct sharp_ls027b7dh01 *priv)
+{
+ u8 clear_buf[2] = { CMD_CLEAR, 0 };
+
+ return spi_write(priv->spi, clear_buf, sizeof(clear_buf));
+}
+
+static int sharp_ls027b7dh01_pwm_enable(struct sharp_ls027b7dh01 *priv)
+{
+ struct device *dev = &priv->spi->dev;
+ struct pwm_state pwmstate;
+
+ priv->extcomin_pwm = devm_pwm_get(dev, NULL);
+ if (IS_ERR(priv->extcomin_pwm)) {
+ dev_err(dev, "Could not get EXTCOMIN pwm\n");
+ return PTR_ERR(priv->extcomin_pwm);
+ }
+
+ pwm_init_state(priv->extcomin_pwm, &pwmstate);
+ pwm_set_relative_duty_cycle(&pwmstate, 50, 100);
+ pwm_apply_state(priv->extcomin_pwm, &pwmstate);
+
+ pwm_enable(priv->extcomin_pwm);
+
+ return 0;
+}
+
+static void sharp_ls027b7dh01_pipe_enable(struct drm_simple_display_pipe *pipe,
+ struct drm_crtc_state *crtc_state,
+ struct drm_plane_state *plane_state)
+{
+ struct sharp_ls027b7dh01 *priv;
+ int ret, drm_idx;
+
+ priv = drm_to_priv(pipe->crtc.dev);
+
+ if (!drm_dev_enter(pipe->crtc.dev, &drm_idx))
+ return;
+
+ gpiod_set_value(priv->enable_gpio, 1);
+
+ ret = sharp_ls027b7dh01_clear_display(priv);
+ if (ret)
+ goto exit;
+
+ sharp_ls027b7dh01_pwm_enable(priv);
+
+exit:
+ drm_dev_exit(drm_idx);
+}
+
+static const struct drm_simple_display_pipe_funcs sharp_ls027b7dh01_pipe_funcs = {
+ .enable = sharp_ls027b7dh01_pipe_enable,
+ .disable = sharp_ls027b7dh01_pipe_disable,
+ .update = sharp_ls027b7dh01_pipe_update,
+};
+
+static int sharp_ls027b7dh01_connector_get_modes(struct drm_connector *connector)
+{
+ struct sharp_ls027b7dh01 *priv = drm_to_priv(connector->dev);
+
+ return drm_connector_helper_get_modes_fixed(connector, priv->display_mode);
+}
+
+static const struct drm_connector_helper_funcs sharp_ls027b7dh01_connector_hfuncs = {
+ .get_modes = sharp_ls027b7dh01_connector_get_modes,
+};
+
+static const struct drm_connector_funcs sharp_ls027b7dh01_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_mode_config_funcs sharp_ls027b7dh01_mode_config_funcs = {
+ .fb_create = drm_gem_fb_create_with_dirty,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+static const uint32_t sharp_ls027b7dh01_formats[] = {
+ DRM_FORMAT_XRGB8888,
+};
+
+static const struct drm_display_mode sharp_ls027b7dh01_mode = {
+ DRM_SIMPLE_MODE(400, 240, 59, 35),
+};
+
+DEFINE_DRM_GEM_DMA_FOPS(sharp_ls027b7dh01_fops);
+
+static const struct drm_driver sharp_ls027b7dh01_drm_driver = {
+ .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+ .fops = &sharp_ls027b7dh01_fops,
+ DRM_GEM_DMA_DRIVER_OPS_VMAP,
+ .name = "sharp_ls027b7dh01",
+ .desc = "Sharp ls027b7dh01 Memory LCD",
+ .date = "20231129",
+ .major = 1,
+ .minor = 0,
+};
+
+static int sharp_ls027b7dh01_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ struct sharp_ls027b7dh01 *priv;
+ struct drm_device *drm;
+ unsigned int write_buf_size;
+ int ret;
+
+ if (!dev->coherent_dma_mask) {
+ ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to set dma mask\n");
+ }
+
+ priv = devm_drm_dev_alloc(dev, &sharp_ls027b7dh01_drm_driver,
+ struct sharp_ls027b7dh01, drm);
+ if (IS_ERR(priv))
+ return PTR_ERR(priv);
+
+ spi_set_drvdata(spi, priv);
+ priv->spi = spi;
+
+ priv->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->enable_gpio))
+ return dev_err_probe(dev, PTR_ERR(priv->enable_gpio),
+ "Failed to get GPIO 'enable'\n");
+
+ drm = &priv->drm;
+ ret = drmm_mode_config_init(drm);
+ if (ret)
+ return ret;
+
+ drm->mode_config.funcs = &sharp_ls027b7dh01_mode_config_funcs;
+ priv->display_mode = &sharp_ls027b7dh01_mode;
+
+ /*
+ * write_buf_size:
+ *
+ * hdisplay * vdisplay / 8 => 1 bit per Pixel.
+ * 2 * vdisplay => line number byte + trailer dummy byte for every line.
+ * 2 => write command byte + final trailer dummy byte.
+ */
+ write_buf_size = priv->display_mode->hdisplay * priv->display_mode->vdisplay / 8
+ + 2 * priv->display_mode->vdisplay + 2;
+
+ priv->write_buf = devm_kzalloc(dev, write_buf_size, GFP_KERNEL);
+ if (!priv->write_buf)
+ return -ENOMEM;
+
+ drm->mode_config.min_width = priv->display_mode->hdisplay;
+ drm->mode_config.max_width = priv->display_mode->hdisplay;
+ drm->mode_config.min_height = priv->display_mode->vdisplay;
+ drm->mode_config.max_height = priv->display_mode->vdisplay;
+
+ ret = drm_connector_init(drm, &priv->connector,
+ &sharp_ls027b7dh01_connector_funcs,
+ DRM_MODE_CONNECTOR_SPI);
+ if (ret)
+ return ret;
+
+ drm_connector_helper_add(&priv->connector,
+ &sharp_ls027b7dh01_connector_hfuncs);
+
+ ret = drm_simple_display_pipe_init(drm, &priv->pipe,
+ &sharp_ls027b7dh01_pipe_funcs,
+ sharp_ls027b7dh01_formats,
+ ARRAY_SIZE(sharp_ls027b7dh01_formats),
+ NULL, &priv->connector);
+ if (ret)
+ return ret;
+
+ drm_plane_enable_fb_damage_clips(&priv->pipe.plane);
+ drm_mode_config_reset(drm);
+
+ ret = drm_dev_register(drm, 0);
+ if (ret)
+ return ret;
+
+ drm_fbdev_generic_setup(drm, 0);
+
+ return 0;
+}
+
+static void sharp_ls027b7dh01_remove(struct spi_device *spi)
+{
+ struct sharp_ls027b7dh01 *priv = spi_get_drvdata(spi);
+
+ drm_dev_unplug(&priv->drm);
+ drm_atomic_helper_shutdown(&priv->drm);
+}
+
+static void sharp_ls027b7dh01_shutdown(struct spi_device *spi)
+{
+ struct sharp_ls027b7dh01 *priv = spi_get_drvdata(spi);
+
+ drm_atomic_helper_shutdown(&priv->drm);
+}
+
+static const struct spi_device_id sharp_ls027b7dh01_ids[] = {
+ { "ls027b7dh01" },
+ { },
+};
+MODULE_DEVICE_TABLE(spi, sharp_ls027b7dh01_ids);
+
+static const struct of_device_id sharp_ls027b7dh01_of_match[] = {
+ { .compatible = "sharp,ls027b7dh01", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sharp_ls027b7dh01_of_match);
+
+static struct spi_driver sharp_ls027b7dh01_spi_driver = {
+ .probe = sharp_ls027b7dh01_probe,
+ .remove = sharp_ls027b7dh01_remove,
+ .shutdown = sharp_ls027b7dh01_shutdown,
+ .id_table = sharp_ls027b7dh01_ids,
+ .driver = {
+ .name = "sharp-ls027b7dh01",
+ .of_match_table = sharp_ls027b7dh01_of_match,
+ },
+};
+module_spi_driver(sharp_ls027b7dh01_spi_driver);
+
+MODULE_AUTHOR("Andrew D'Angelo");
+MODULE_AUTHOR("Mehdi Djait <mehdi.djait@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Sharp LS027B7DH01 Driver");
+MODULE_LICENSE("GPL");
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)
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