From: Thierry Reding treding@nvidia.com
The TPS3 capability can be exposed by DP 1.2 and later sinks if they support the alternative training pattern for channel equalization.
Signed-off-by: Thierry Reding treding@nvidia.com --- drivers/gpu/drm/drm_dp_helper.c | 4 ++++ include/drm/drm_dp_helper.h | 1 + 2 files changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index c48addaf4301..45701c650a5d 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -311,6 +311,10 @@ int drm_dp_link_probe(struct drm_dp_aux *aux, struct drm_dp_link *link) if (values[2] & DP_ENHANCED_FRAME_CAP) link->capabilities |= DP_LINK_CAP_ENHANCED_FRAMING;
+ if (link->revision >= 0x12) + if (values[2] & DP_TPS3_SUPPORTED) + link->capabilities |= DP_LINK_CAP_TPS3; + if (values[3] & DP_NO_AUX_HANDSHAKE_LINK_TRAINING) link->capabilities |= DP_LINK_CAP_FAST_TRAINING;
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 83be142395ff..9e70ea8b907d 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -745,6 +745,7 @@ int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux, #define DP_LINK_CAP_ENHANCED_FRAMING (1 << 0) #define DP_LINK_CAP_FAST_TRAINING (1 << 1) #define DP_LINK_CAP_ANSI_8B10B (1 << 2) +#define DP_LINK_CAP_TPS3 (1 << 3)
struct drm_dp_link { unsigned char revision;