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drm/dp: Add drm_dp_fast_training_cap() helper
author
Thierry Reding
<treding@nvidia.com>
Mon, 21 Oct 2019 14:34:27 +0000
(16:34 +0200)
committer
Thierry Reding
<treding@nvidia.com>
Wed, 23 Oct 2019 16:18:45 +0000
(18:18 +0200)
Add a helper that checks for the fast training capability given the DPCD
receiver capabilities blob.
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link:
https://patchwork.freedesktop.org/patch/msgid/20191021143437.1477719-4-thierry.reding@gmail.com
include/drm/drm_dp_helper.h
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diff --git
a/include/drm/drm_dp_helper.h
b/include/drm/drm_dp_helper.h
index
e0e76f7
..
1179d3f
100644
(file)
--- a/
include/drm/drm_dp_helper.h
+++ b/
include/drm/drm_dp_helper.h
@@
-1216,6
+1216,13
@@
drm_dp_enhanced_frame_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
}
static inline bool
+drm_dp_fast_training_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
+{
+ return dpcd[DP_DPCD_REV] >= 0x11 &&
+ (dpcd[DP_MAX_DOWNSPREAD] & DP_NO_AUX_HANDSHAKE_LINK_TRAINING);
+}
+
+static inline bool
drm_dp_tps3_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
return dpcd[DP_DPCD_REV] >= 0x12 &&