drivers/gpu/drm/panel/panel-jdi-lt070me05000.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/panel/panel-jdi-lt070me05000.c
Extension
.c
Size
10030 bytes
Lines
419
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct jdi_panel {
	struct drm_panel base;
	struct mipi_dsi_device *dsi;

	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];

	struct gpio_desc *enable_gpio;
	struct gpio_desc *reset_gpio;
	struct gpio_desc *dcdc_en_gpio;
	struct backlight_device *backlight;

	const struct drm_display_mode *mode;
};

static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel)
{
	return container_of(panel, struct jdi_panel, base);
}

static int jdi_panel_init(struct jdi_panel *jdi)
{
	struct mipi_dsi_device *dsi = jdi->dsi;
	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;

	mipi_dsi_dcs_soft_reset_multi(&dsi_ctx);
	mipi_dsi_usleep_range(&dsi_ctx, 10000, 20000);

	mipi_dsi_dcs_set_pixel_format_multi(&dsi_ctx, MIPI_DCS_PIXEL_FMT_24BIT << 4);
	mipi_dsi_dcs_set_column_address_multi(&dsi_ctx, 0, jdi->mode->hdisplay - 1);
	mipi_dsi_dcs_set_page_address_multi(&dsi_ctx, 0, jdi->mode->vdisplay - 1);

	/*
	 * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers
	 *                  are active
	 * BIT(3) BL = 1    Backlight Control On
	 * BIT(2) DD = 0    Display Dimming is Off
	 */
	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x24);

	/* CABC off */
	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_POWER_SAVE, 0x00);

	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 120);

	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x00);
	mipi_dsi_usleep_range(&dsi_ctx, 10000, 11000);

	/* Interface setting, video mode */
	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb3, 0x26, 0x08, 0x00, 0x20, 0x00);
	mipi_dsi_usleep_range(&dsi_ctx, 20000, 21000);

	mipi_dsi_generic_write_seq_multi(&dsi_ctx, 0xb0, 0x03);

	return dsi_ctx.accum_err;
}

static int jdi_panel_on(struct jdi_panel *jdi)
{
	struct mipi_dsi_device *dsi = jdi->dsi;
	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;

	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);

	return dsi_ctx.accum_err;
}

static void jdi_panel_off(struct jdi_panel *jdi)
{
	struct mipi_dsi_device *dsi = jdi->dsi;
	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
	/* Reset error to continue power-down even if display off failed */
	dsi_ctx.accum_err = 0;
	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);

	msleep(100);
}

static int jdi_panel_disable(struct drm_panel *panel)
{
	struct jdi_panel *jdi = to_jdi_panel(panel);

Annotation

Implementation Notes