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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
This commit is contained in:
Thierry Reding 2019-10-21 16:34:29 +02:00
parent 99c830b8b7
commit 7624629d06
1 changed files with 7 additions and 0 deletions
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7
include/drm/drm_dp_helper.h
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@ -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
*/