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Commit babc9493 authored by Jani Nikula's avatar Jani Nikula Committed by Daniel Vetter
Browse files

drm/edid: add #defines and helpers for ELD 



In the interest of reducing magic numbers and having to cross check with
the specs all the time.

Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Reviewed-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent e9cf6194

include/drm/drm_edid.h

+102 −0
Original line number Diff line number Diff line
@@ -207,6 +207,61 @@ struct detailed_timing { 
#define DRM_EDID_HDMI_DC_30               (1 << 4)

#define DRM_EDID_HDMI_DC_Y444             (1 << 3)



/* 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_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_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))



struct edid {

	u8 header[8];

	/* Vendor & product info */
@@ -279,4 +334,51 @@ int 
drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,

					    const struct drm_display_mode *mode);



/**

 * 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 uint8_t *eld)

{

	return (eld[DRM_ELD_CEA_EDID_VER_MNL] & DRM_ELD_MNL_MASK) >> DRM_ELD_MNL_SHIFT;

}



/**

 * drm_eld_sad_count - Get ELD SAD count.

 * @eld: pointer to an eld memory structure with sad_count set

 */

static inline int drm_eld_sad_count(const uint8_t *eld)

{

	return (eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_SAD_COUNT_MASK) >>

		DRM_ELD_SAD_COUNT_SHIFT;

}



/**

 * drm_eld_calc_baseline_block_size - Calculate baseline block size in bytes

 * @eld: pointer to an eld memory structure with mnl and sad_count set

 *

 * This is a helper for determining the payload size of the baseline block, in

 * bytes, for e.g. setting the Baseline_ELD_Len field in the ELD header block.

 */

static inline int drm_eld_calc_baseline_block_size(const uint8_t *eld)

{

	return DRM_ELD_MONITOR_NAME_STRING - DRM_ELD_HEADER_BLOCK_SIZE +

		drm_eld_mnl(eld) + drm_eld_sad_count(eld) * 3;

}



/**

 * drm_eld_size - Get ELD size in bytes

 * @eld: pointer to a complete eld memory structure

 *

 * The returned value does not include the vendor block. It's vendor specific,

 * and comprises of the remaining bytes in the ELD memory buffer after

 * drm_eld_size() bytes of header and baseline block.

 *

 * The returned value is guaranteed to be a multiple of 4.

 */

static inline int drm_eld_size(const uint8_t *eld)

{

	return DRM_ELD_HEADER_BLOCK_SIZE + eld[DRM_ELD_BASELINE_ELD_LEN] * 4;

}



#endif /* __DRM_EDID_H__ */