include/drm/drm_eld.h

Source file repositories/reference/linux-study-clean/include/drm/drm_eld.h

File Facts

System
Linux kernel
Corpus path
include/drm/drm_eld.h
Extension
.h
Size
4874 bytes
Lines
165
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __DRM_ELD_H__
#define __DRM_ELD_H__

#include <linux/types.h>

struct cea_sad;

/* ELD Header Block */
#define DRM_ELD_HEADER_BLOCK_SIZE	4

#define DRM_ELD_VER			0
# define DRM_ELD_VER_SHIFT		3
# define DRM_ELD_VER_MASK		(0x1f << 3)
# define DRM_ELD_VER_CEA861D		(2 << 3) /* supports 861D or below */
# define DRM_ELD_VER_CANNED		(0x1f << 3)

#define DRM_ELD_BASELINE_ELD_LEN	2	/* in dwords! */

/* ELD Baseline Block for ELD_Ver == 2 */
#define DRM_ELD_CEA_EDID_VER_MNL	4
# define DRM_ELD_CEA_EDID_VER_SHIFT	5
# define DRM_ELD_CEA_EDID_VER_MASK	(7 << 5)
# define DRM_ELD_CEA_EDID_VER_NONE	(0 << 5)
# define DRM_ELD_CEA_EDID_VER_CEA861	(1 << 5)
# define DRM_ELD_CEA_EDID_VER_CEA861A	(2 << 5)
# define DRM_ELD_CEA_EDID_VER_CEA861BCD	(3 << 5)
# define DRM_ELD_MNL_SHIFT		0
# define DRM_ELD_MNL_MASK		(0x1f << 0)

#define DRM_ELD_SAD_COUNT_CONN_TYPE	5
# define DRM_ELD_SAD_COUNT_SHIFT	4
# define DRM_ELD_SAD_COUNT_MASK		(0xf << 4)
# define DRM_ELD_CONN_TYPE_SHIFT	2
# define DRM_ELD_CONN_TYPE_MASK		(3 << 2)
# define DRM_ELD_CONN_TYPE_HDMI		(0 << 2)
# define DRM_ELD_CONN_TYPE_DP		(1 << 2)
# define DRM_ELD_SUPPORTS_AI		(1 << 1)
# define DRM_ELD_SUPPORTS_HDCP		(1 << 0)

#define DRM_ELD_AUD_SYNCH_DELAY		6	/* in units of 2 ms */
# define DRM_ELD_AUD_SYNCH_DELAY_MAX	0xfa	/* 500 ms */

#define DRM_ELD_SPEAKER			7
# define DRM_ELD_SPEAKER_MASK		0x7f
# define DRM_ELD_SPEAKER_RLRC		(1 << 6)
# define DRM_ELD_SPEAKER_FLRC		(1 << 5)
# define DRM_ELD_SPEAKER_RC		(1 << 4)
# define DRM_ELD_SPEAKER_RLR		(1 << 3)
# define DRM_ELD_SPEAKER_FC		(1 << 2)
# define DRM_ELD_SPEAKER_LFE		(1 << 1)
# define DRM_ELD_SPEAKER_FLR		(1 << 0)

#define DRM_ELD_PORT_ID			8	/* offsets 8..15 inclusive */
# define DRM_ELD_PORT_ID_LEN		8

#define DRM_ELD_MANUFACTURER_NAME0	16
#define DRM_ELD_MANUFACTURER_NAME1	17

#define DRM_ELD_PRODUCT_CODE0		18
#define DRM_ELD_PRODUCT_CODE1		19

#define DRM_ELD_MONITOR_NAME_STRING	20	/* offsets 20..(20+mnl-1) inclusive */

#define DRM_ELD_CEA_SAD(mnl, sad)	(20 + (mnl) + 3 * (sad))

/**
 * drm_eld_mnl - Get ELD monitor name length in bytes.
 * @eld: pointer to an eld memory structure with mnl set
 */
static inline int drm_eld_mnl(const u8 *eld)
{
	return (eld[DRM_ELD_CEA_EDID_VER_MNL] & DRM_ELD_MNL_MASK) >> DRM_ELD_MNL_SHIFT;
}

int drm_eld_sad_get(const u8 *eld, int sad_index, struct cea_sad *cta_sad);
int drm_eld_sad_set(u8 *eld, int sad_index, const struct cea_sad *cta_sad);

/**
 * drm_eld_sad - Get ELD SAD structures.
 * @eld: pointer to an eld memory structure with sad_count set
 */
static inline const u8 *drm_eld_sad(const u8 *eld)
{
	unsigned int ver, mnl;

	ver = (eld[DRM_ELD_VER] & DRM_ELD_VER_MASK) >> DRM_ELD_VER_SHIFT;
	if (ver != 2 && ver != 31)
		return NULL;

	mnl = drm_eld_mnl(eld);

Annotation

Implementation Notes