diff options
| author | Khaled Almahallawy <khaled.almahallawy@intel.com> | 2021-02-26 00:15:54 -0800 |
|---|---|---|
| committer | Imre Deak <imre.deak@intel.com> | 2021-07-29 19:46:14 +0300 |
| commit | 155b8645de9e0f07b654025fe91725ca2f67d12a (patch) | |
| tree | eea85603f1e1341c6a96437ca97ac57123ec02f9 /drivers/gpu/drm/i915/display/intel_dp.c | |
| parent | 11955c87d209c81cec6bb7c21a2a12c4c48c4fb4 (diff) | |
drm/i915/dp: DPTX writes Swing/Pre-emphs(DPCD 0x103-0x106) requested during PHY Layer testing
Source needs to write DPCD 103-106 after receiving a PHY request to change
swing/pre-emphasis after reading DPCD 206-207. This is especially needed if
there is a retimer between source and sink and the retimer implements AUX_CH
interception scheme to manage DP PHY settings (e.g. adjusting Swing/Pre-emphasis
equalization level) for DP output channel. If the source doesn't write to
DPCD 103-106, the retimer may not output the requested swing/pre-emphasis and
eventually we fail compliance.
v2: Rebase and use crtc->lane_count (Imre)
Signed-off-by: Khaled Almahallawy <khaled.almahallawy@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210226081554.984307-1-khaled.almahallawy@intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_dp.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index c386ef8eb200..a54e339947c6 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -3356,6 +3356,9 @@ static void intel_dp_process_phy_request(struct intel_dp *intel_dp, intel_dp_autotest_phy_ddi_enable(intel_dp, crtc_state); + drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_LANE0_SET, + intel_dp->train_set, crtc_state->lane_count); + drm_dp_set_phy_test_pattern(&intel_dp->aux, data, link_status[DP_DPCD_REV]); } |