drm/dp: DRM DP helper for reading Ignore MSA from DPCD
DP sink device sets the Ignore MSA bit in its DP_DOWNSTREAM_PORT_COUNT register to indicate its ability to ignore the MSA video timing parameters and its ability to support seamless video timing change over a range of timing exposed by DisplayID and EDID. This is required for the sink to indicate that it is Adaptive sync capable. v3: * Fi the typo in commit message (Manasi) v2: * Rename to describe what the function does (Jani Nikula) Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Harry Wentland <harry.wentland@amd.com> Cc: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com> Reviewed-by: Harry Wentland <harry.wentland@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200619212356.19285-2-bhanuprakash.modem@intel.com
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@ -1324,6 +1324,14 @@ drm_dp_alternate_scrambler_reset_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
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DP_ALTERNATE_SCRAMBLER_RESET_CAP;
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}
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/* Ignore MSA timing for Adaptive Sync support on DP 1.4 */
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static inline bool
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drm_dp_sink_can_do_video_without_timing_msa(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
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{
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return dpcd[DP_DOWN_STREAM_PORT_COUNT] &
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DP_MSA_TIMING_PAR_IGNORED;
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}
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/*
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* DisplayPort AUX channel
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*/
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