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drm/i915: Print the DP vswing adjustment request

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Print out each DP vswing adjustment request we got from the RX.
Could help in diagnosing what's going on during link training.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211004170535.4173-4-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
This commit is contained in:
Ville Syrjälä 2021-10-04 20:05:33 +03:00
parent be1525048c
commit 1f66267533
1 changed files with 27 additions and 0 deletions
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27
drivers/gpu/drm/i915/display/intel_dp_link_training.c
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@ -343,14 +343,41 @@ static u8 intel_dp_get_lane_adjust_train(struct intel_dp *intel_dp,
return v | p;
}
#define TRAIN_REQ_FMT "%d/%d/%d/%d"
#define _TRAIN_REQ_VSWING_ARGS(link_status, lane) \
(drm_dp_get_adjust_request_voltage((link_status), (lane)) >> DP_TRAIN_VOLTAGE_SWING_SHIFT)
#define TRAIN_REQ_VSWING_ARGS(link_status) \
_TRAIN_REQ_VSWING_ARGS(link_status, 0), \
_TRAIN_REQ_VSWING_ARGS(link_status, 1), \
_TRAIN_REQ_VSWING_ARGS(link_status, 2), \
_TRAIN_REQ_VSWING_ARGS(link_status, 3)
#define _TRAIN_REQ_PREEMPH_ARGS(link_status, lane) \
(drm_dp_get_adjust_request_pre_emphasis((link_status), (lane)) >> DP_TRAIN_PRE_EMPHASIS_SHIFT)
#define TRAIN_REQ_PREEMPH_ARGS(link_status) \
_TRAIN_REQ_PREEMPH_ARGS(link_status, 0), \
_TRAIN_REQ_PREEMPH_ARGS(link_status, 1), \
_TRAIN_REQ_PREEMPH_ARGS(link_status, 2), \
_TRAIN_REQ_PREEMPH_ARGS(link_status, 3)
void
intel_dp_get_adjust_train(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state,
enum drm_dp_phy dp_phy,
const u8 link_status[DP_LINK_STATUS_SIZE])
{
struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
char phy_name[10];
int lane;
drm_dbg_kms(encoder->base.dev, "[ENCODER:%d:%s] lanes: %d, "
"vswing request: " TRAIN_REQ_FMT ", "
"pre-emphasis request: " TRAIN_REQ_FMT ", at %s\n",
encoder->base.base.id, encoder->base.name,
crtc_state->lane_count,
TRAIN_REQ_VSWING_ARGS(link_status),
TRAIN_REQ_PREEMPH_ARGS(link_status),
intel_dp_phy_name(dp_phy, phy_name, sizeof(phy_name)));
for (lane = 0; lane < 4; lane++)
intel_dp->train_set[lane] =
intel_dp_get_lane_adjust_train(intel_dp, crtc_state,