diff options
| author | Arun R Murthy <arun.r.murthy@intel.com> | 2024-10-11 07:58:25 +0300 |
|---|---|---|
| committer | Suraj Kandpal <suraj.kandpal@intel.com> | 2024-11-18 11:02:45 +0300 |
| commit | eb0c1757a36cabb730cde4e045eb52587602504d (patch) | |
| tree | 3eb102a21362c739dc743afd357b2737416516b1 /drivers/gpu/drm/i915/display/intel_dp_link_training.c | |
| parent | af02ee4fb63342c873b747d724cd5ada13c2bde1 (diff) | |
| download | linux-eb0c1757a36cabb730cde4e045eb52587602504d.tar.xz | |
drm/i915/dp: read Aux RD interval just before setting the FFE preset
Figure 3-52: 128b132b DP DPTC LANEx_CHANNEL_EQ_DONE Sequence of
DP2.1a spec.
After reading LANEx_CHANNEL_EQ_DONE, read the FFE presets.
AUX_RD_INTERVAL and then write the new FFE presets.
v4: Read AUX_RD_INTERVAL before get/set TX FFE preset (Jani)
Co-developed-by: Srikanth V NagaVenkata <nagavenkata.srikanth.v@intel.com>
Signed-off-by: Arun R Murthy <arun.r.murthy@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241011045825.2629469-1-arun.r.murthy@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_dp_link_training.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp_link_training.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c index f41b69840ad9..a48a70ca4fb3 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -1419,12 +1419,6 @@ intel_dp_128b132b_lane_eq(struct intel_dp *intel_dp, for (try = 0; try < max_tries; try++) { fsleep(delay_us); - /* - * The delay may get updated. The transmitter shall read the - * delay before link status during link training. - */ - delay_us = drm_dp_128b132b_read_aux_rd_interval(&intel_dp->aux); - if (drm_dp_dpcd_read_link_status(&intel_dp->aux, link_status) < 0) { lt_err(intel_dp, DP_PHY_DPRX, "Failed to read link status\n"); return false; @@ -1451,8 +1445,15 @@ intel_dp_128b132b_lane_eq(struct intel_dp *intel_dp, if (time_after(jiffies, deadline)) timeout = true; /* try one last time after deadline */ - /* Update signal levels and training set as requested. */ + /* + * During LT, Tx shall read AUX_RD_INTERVAL just before writing the new FFE + * presets. + */ + delay_us = drm_dp_128b132b_read_aux_rd_interval(&intel_dp->aux); + intel_dp_get_adjust_train(intel_dp, crtc_state, DP_PHY_DPRX, link_status); + + /* Update signal levels and training set as requested. */ if (!intel_dp_update_link_train(intel_dp, crtc_state, DP_PHY_DPRX)) { lt_err(intel_dp, DP_PHY_DPRX, "Failed to update TX FFE settings\n"); return false; |