drivers/gpu/drm/panel/panel-elida-kd35t133.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/panel/panel-elida-kd35t133.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/panel/panel-elida-kd35t133.c
Extension
.c
Size
8417 bytes
Lines
299
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 kd35t133 {
	struct device *dev;
	struct drm_panel panel;
	struct gpio_desc *reset_gpio;
	struct regulator *vdd;
	struct regulator *iovcc;
	enum drm_panel_orientation orientation;
};

static inline struct kd35t133 *panel_to_kd35t133(struct drm_panel *panel)
{
	return container_of(panel, struct kd35t133, panel);
}

static void kd35t133_init_sequence(struct mipi_dsi_multi_context *dsi_ctx)
{
	/*
	 * Init sequence was supplied by the panel vendor with minimal
	 * documentation.
	 */
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POSITIVEGAMMA,
				     0x00, 0x13, 0x18, 0x04, 0x0f, 0x06, 0x3a, 0x56,
				     0x4d, 0x03, 0x0a, 0x06, 0x30, 0x3e, 0x0f);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_NEGATIVEGAMMA,
				     0x00, 0x13, 0x18, 0x01, 0x11, 0x06, 0x38, 0x34,
				     0x4d, 0x06, 0x0d, 0x0b, 0x31, 0x37, 0x0f);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POWERCONTROL1, 0x18, 0x17);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_POWERCONTROL2, 0x41);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_VCOMCONTROL, 0x00, 0x1a, 0x80);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, MIPI_DCS_SET_ADDRESS_MODE, 0x48);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_INTERFACEMODECTRL, 0x00);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_FRAMERATECTRL, 0xa0);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_DISPLAYINVERSIONCTRL, 0x02);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_DISPLAYFUNCTIONCTRL,
				     0x20, 0x02);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_SETIMAGEFUNCTION, 0x00);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, KD35T133_CMD_ADJUSTCONTROL3,
				     0xa9, 0x51, 0x2c, 0x82);
	mipi_dsi_dcs_write_seq_multi(dsi_ctx, MIPI_DCS_ENTER_INVERT_MODE);
}

static int kd35t133_unprepare(struct drm_panel *panel)
{
	struct kd35t133 *ctx = panel_to_kd35t133(panel);
	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
	if (dsi_ctx.accum_err)
		return dsi_ctx.accum_err;

	gpiod_set_value_cansleep(ctx->reset_gpio, 1);

	regulator_disable(ctx->iovcc);
	regulator_disable(ctx->vdd);

	return 0;
}

static int kd35t133_prepare(struct drm_panel *panel)
{
	struct kd35t133 *ctx = panel_to_kd35t133(panel);
	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
	struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

	dev_dbg(ctx->dev, "Resetting the panel\n");
	dsi_ctx.accum_err = regulator_enable(ctx->vdd);
	if (dsi_ctx.accum_err) {
		dev_err(ctx->dev, "Failed to enable vdd supply: %d\n",
			dsi_ctx.accum_err);
		return dsi_ctx.accum_err;
	}

	dsi_ctx.accum_err = regulator_enable(ctx->iovcc);
	if (dsi_ctx.accum_err) {
		dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n",
			dsi_ctx.accum_err);
		goto disable_vdd;
	}

	msleep(20);

	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
	usleep_range(10, 20);
	gpiod_set_value_cansleep(ctx->reset_gpio, 0);

	msleep(20);

Annotation

Implementation Notes