drivers/gpu/drm/panel/panel-raydium-rm69380.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/panel/panel-raydium-rm69380.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/panel/panel-raydium-rm69380.c
Extension
.c
Size
8201 bytes
Lines
310
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 rm69380_panel {
	struct drm_panel panel;
	struct mipi_dsi_device *dsi[2];
	struct regulator_bulk_data supplies[2];
	struct gpio_desc *reset_gpio;
};

static inline
struct rm69380_panel *to_rm69380_panel(struct drm_panel *panel)
{
	return container_of(panel, struct rm69380_panel, panel);
}

static void rm69380_reset(struct rm69380_panel *ctx)
{
	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
	usleep_range(15000, 16000);
	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
	usleep_range(10000, 11000);
	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
	msleep(30);
}

static int rm69380_on(struct rm69380_panel *ctx)
{
	struct mipi_dsi_device *dsi = ctx->dsi[0];
	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
	if (ctx->dsi[1])
		ctx->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;

	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xfe, 0xd4);
	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x00, 0x80);
	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xfe, 0xd0);
	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x48, 0x00);
	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xfe, 0x26);
	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x75, 0x3f);
	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x1d, 0x1a);
	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xfe, 0x00);
	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x28);
	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xc2, 0x08);

	mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 20);

	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 36);

	return dsi_ctx.accum_err;
}

static void rm69380_off(struct rm69380_panel *ctx)
{
	struct mipi_dsi_device *dsi = ctx->dsi[0];
	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
	if (ctx->dsi[1])
		ctx->dsi[1]->mode_flags &= ~MIPI_DSI_MODE_LPM;

	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 35);
	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 20);
}

static int rm69380_prepare(struct drm_panel *panel)
{
	struct rm69380_panel *ctx = to_rm69380_panel(panel);
	int ret;

	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
	if (ret < 0)
		return ret;

	rm69380_reset(ctx);

	ret = rm69380_on(ctx);
	if (ret < 0) {
		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
	}

	return ret;
}

static int rm69380_unprepare(struct drm_panel *panel)
{

Annotation

Implementation Notes