mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-16 09:02:21 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/i915/dp: Have intel_dp_get_adjust_train() tell us if anything changed

Browse Source 
In order to implement the POST_LT_ADJ_REQ sequence we need to
know whether the sink actually requested a changed to the
vswing/pre-emph values.

Tested-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250710201718.25310-5-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä
2025-07-10 23:17:15 +03:00
parent 11fab5a2a1
commit b840bb0b7e
2 changed files with 14 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/gpu/drm/i915/display/intel_dp_link_training.c
View File

@@ -478,12 +478,13 @@ static u8 intel_dp_get_lane_adjust_train(struct intel_dp *intel_dp,
_TRAIN_REQ_TX_FFE_ARGS(link_status, 2), \
_TRAIN_REQ_TX_FFE_ARGS(link_status, 3)
void
bool
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])
{
bool changed = false;
int lane;
if (intel_dp_is_uhbr(crtc_state)) {
@@ -502,10 +503,17 @@ intel_dp_get_adjust_train(struct intel_dp *intel_dp,
TRAIN_REQ_PREEMPH_ARGS(link_status));
}
for (lane = 0; lane < 4; lane++)
intel_dp->train_set[lane] =
intel_dp_get_lane_adjust_train(intel_dp, crtc_state,
dp_phy, link_status, lane);
for (lane = 0; lane < 4; lane++) {
u8 new = intel_dp_get_lane_adjust_train(intel_dp, crtc_state,
dp_phy, link_status, lane);
if (intel_dp->train_set[lane] == new)
continue;
intel_dp->train_set[lane] = new;
changed = true;
}
return changed;
}
static int intel_dp_training_pattern_set_reg(struct intel_dp *intel_dp,

2
drivers/gpu/drm/i915/display/intel_dp_link_training.h
View File

@@ -23,7 +23,7 @@ void intel_dp_link_training_set_bw(struct intel_dp *intel_dp,
int link_bw, int rate_select, int lane_count,
bool enhanced_framing);
void intel_dp_get_adjust_train(struct intel_dp *intel_dp,
bool 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]);