drivers/gpu/drm/imx/ipuv3/parallel-display.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/imx/ipuv3/parallel-display.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/imx/ipuv3/parallel-display.c
Extension
.c
Size
8309 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 imx_parallel_display_encoder {
	struct drm_encoder encoder;
};

struct imx_parallel_display {
	struct device *dev;
	u32 bus_format;
	struct drm_bridge *next_bridge;
	struct drm_bridge bridge;
};

static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
{
	return container_of(b, struct imx_parallel_display, bridge);
}

static const u32 imx_pd_bus_fmts[] = {
	MEDIA_BUS_FMT_RGB888_1X24,
	MEDIA_BUS_FMT_BGR888_1X24,
	MEDIA_BUS_FMT_GBR888_1X24,
	MEDIA_BUS_FMT_RGB666_1X18,
	MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
	MEDIA_BUS_FMT_RGB565_1X16,
};

static u32 *
imx_pd_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
					 struct drm_bridge_state *bridge_state,
					 struct drm_crtc_state *crtc_state,
					 struct drm_connector_state *conn_state,
					 unsigned int *num_output_fmts)
{
	struct drm_display_info *di = &conn_state->connector->display_info;
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
	u32 *output_fmts;

	if (!imxpd->bus_format && !di->num_bus_formats) {
		*num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
		return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
			       GFP_KERNEL);
	}

	*num_output_fmts = 1;
	output_fmts = kmalloc_obj(*output_fmts);
	if (!output_fmts)
		return NULL;

	if (!imxpd->bus_format && di->num_bus_formats)
		output_fmts[0] = di->bus_formats[0];
	else
		output_fmts[0] = imxpd->bus_format;

	return output_fmts;
}

static bool imx_pd_format_supported(u32 output_fmt)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
		if (imx_pd_bus_fmts[i] == output_fmt)
			return true;
	}

	return false;
}

static u32 *
imx_pd_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
					struct drm_bridge_state *bridge_state,
					struct drm_crtc_state *crtc_state,
					struct drm_connector_state *conn_state,
					u32 output_fmt,
					unsigned int *num_input_fmts)
{
	struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
	u32 *input_fmts;

	/*
	 * If the next bridge does not support bus format negotiation, let's
	 * use the static bus format definition (imxpd->bus_format) if it's
	 * specified, RGB888 when it's not.
	 */
	if (output_fmt == MEDIA_BUS_FMT_FIXED)
		output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;

	/* Now make sure the requested output format is supported. */
	if (!imx_pd_format_supported(output_fmt)) {
		*num_input_fmts = 0;
		return NULL;

Annotation

Implementation Notes