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Commit c82dbe5c authored by Arnaud Pouliquen's avatar Arnaud Pouliquen Committed by Mark Brown
Browse files

DRM: add help to get ELD speaker allocation 



Add helper to allow users to retrieve the speaker allocations without
knowledge of the ELD structure.

Signed-off-by: default avatarArnaud Pouliquen <arnaud.pouliquen@st.com>
Reviewed-by: default avatarJani Nikula <jani.nikula@intel.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent a5de5b74

include/drm/drm_edid.h

+13 −0
Original line number Diff line number Diff line
@@ -248,6 +248,7 @@ struct detailed_timing { 
# 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)
@@ -414,6 +415,18 @@ static inline int drm_eld_size(const uint8_t *eld) 
	return DRM_ELD_HEADER_BLOCK_SIZE + eld[DRM_ELD_BASELINE_ELD_LEN] * 4;

}



/**

 * drm_eld_get_spk_alloc - Get speaker allocation

 * @eld: pointer to an ELD memory structure

 *

 * The returned value is the speakers mask. User has to use %DRM_ELD_SPEAKER

 * field definitions to identify speakers.

 */

static inline u8 drm_eld_get_spk_alloc(const uint8_t *eld)

{

	return eld[DRM_ELD_SPEAKER] & DRM_ELD_SPEAKER_MASK;

}



/**

 * drm_eld_get_conn_type - Get device type hdmi/dp connected

 * @eld: pointer to an ELD memory structure