mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-04-29 07:02:29 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/i915/dp: Reduce link params only after retrying with unchanged params

Browse Source 
Try to maintain the current link parameters by retrying the link
training with unchanged link parameters before reducing these parameters
(sending an uevent to userspace to retrain the link instead).

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240610164933.2947366-9-imre.deak@intel.com
This commit is contained in:
Imre Deak
2024-06-10 19:49:20 +03:00
parent 3b3be899fc
commit 5bd3e7ea88
3 changed files with 14 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

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

@@ -1771,6 +1771,8 @@ struct intel_dp {
int max_lane_count;
/* Max rate for the current link */
int max_rate;
/* Sequential link training failures after a passing LT */
int seq_train_failures;
} link;
bool reset_link_params;
int mso_link_count;

4
drivers/gpu/drm/i915/display/intel_dp.c
View File

@@ -2961,6 +2961,7 @@ static void intel_dp_reset_link_params(struct intel_dp *intel_dp)
{
intel_dp->link.max_lane_count = intel_dp_max_common_lane_count(intel_dp);
intel_dp->link.max_rate = intel_dp_max_common_rate(intel_dp);
intel_dp->link.seq_train_failures = 0;
}
/* Enable backlight PWM and backlight PP control. */
@@ -5075,6 +5076,9 @@ intel_dp_needs_link_retrain(struct intel_dp *intel_dp)
intel_dp->lane_count))
return false;
if (intel_dp->link.seq_train_failures)
return true;
/* Retrain if link not ok */
return !intel_dp_link_ok(intel_dp, link_status);
}

8
drivers/gpu/drm/i915/display/intel_dp_link_training.c
View File

@@ -1487,10 +1487,13 @@ void intel_dp_start_link_train(struct intel_dp *intel_dp,
passed = intel_dp_link_train_all_phys(intel_dp, crtc_state, lttpr_count);
if (passed) {
intel_dp->link.seq_train_failures = 0;
intel_encoder_link_check_queue_work(encoder, 2000);
return;
}
intel_dp->link.seq_train_failures++;
/*
* Ignore the link failure in CI
*
@@ -1508,6 +1511,11 @@ void intel_dp_start_link_train(struct intel_dp *intel_dp,
return;
}
if (intel_dp->link.seq_train_failures < 2) {
intel_encoder_link_check_queue_work(encoder, 0);
return;
}
intel_dp_schedule_fallback_link_training(intel_dp, crtc_state);
}