drm/dp: Add drm_dp_alternate_scrambler_reset_cap() helper
Add a helper to check if the sink supports the eDP alternate scrambler
reset value of 0xfffe.
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191021143437.1477719-6-thierry.reding@gmail.com
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index bc276c8..b3402cb 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1294,6 +1294,13 @@ drm_dp_channel_coding_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
return dpcd[DP_MAIN_LINK_CHANNEL_CODING] & DP_CAP_ANSI_8B10B;
}
+static inline bool
+drm_dp_alternate_scrambler_reset_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+ return dpcd[DP_EDP_CONFIGURATION_CAP] &
+ DP_ALTERNATE_SCRAMBLER_RESET_CAP;
+}
+
/*
* DisplayPort AUX channel
*/