From 857d828374cc84d07c7b94db2cf535aa517444dd Mon Sep 17 00:00:00 2001 From: Anusha Srivatsa Date: Thu, 1 Nov 2018 21:14:55 -0700 Subject: [PATCH] drm/dp/fec: DRM helper for Forward Error Correction DP 1.4 has Forward Error Correction Support(FEC). Add helper function to check if the sink device supports FEC. v2: Separate the helper and the code that uses the helper into two separate patches. (Manasi) v3: - Move the code to drm_dp_helper.c (Manasi) - change the return type, code style changes (Gaurav) - Use drm_dp_dpcd_readb instead of drm_dp_dpcd_read. (Jani) v4: - Avoid aux reads everytime, instead read cached values of dpcd register (jani) - Move helper to drm_dp_helper.h like other dsc helpers.(Anusha) v5: rebased. Change the helper parameter suitably. Cc: Ville Syrjala Cc: Jani Nikula Cc: Manasi Navare Acked-by: Sean Paul (For merging through drm-intel) Signed-off-by: Anusha Srivatsa Reviewed-by: Manasi Navare Signed-off-by: Manasi Navare Link: https://patchwork.freedesktop.org/patch/msgid/20181102041455.15818-2-anusha.srivatsa@intel.com --- include/drm/drm_dp_helper.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index f82e68db16e0..3e781dfb6fc1 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1147,6 +1147,13 @@ drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]) DP_DSC_SLICE_WIDTH_MULTIPLIER; } +/* Forward Error Correction Support on DP 1.4 */ +static inline bool +drm_dp_sink_supports_fec(const u8 fec_capable) +{ + return fec_capable & DP_FEC_CAPABLE; +} + /* * DisplayPort AUX channel */