Issue a aux write transaction to dpcd 0xf000a with total number of lttpr before link traning.
Cc: Jouni Högander <[email protected]> Signed-off-by: Animesh Manna <[email protected]> --- .../gpu/drm/i915/display/intel_dp_link_training.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) 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 27f3716bdc1f..b1e3ab3f8efc 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -1623,6 +1623,16 @@ intel_dp_128b132b_link_train(struct intel_dp *intel_dp, return passed; } +static void intel_dp_update_lttpr_count(struct intel_dp *intel_dp, + int lttpr_count) +{ + if (!intel_dp_is_edp(intel_dp) || + intel_dp->lttpr_common_caps[0] <= 0x20) + return; + + drm_dp_dpcd_writeb(&intel_dp->aux, DP_TOTAL_LTTPR_CNT, lttpr_count); +} + /** * intel_dp_start_link_train - start link training * @state: Atomic state @@ -1659,6 +1669,8 @@ void intel_dp_start_link_train(struct intel_atomic_state *state, intel_dp_prepare_link_train(intel_dp, crtc_state); + intel_dp_update_lttpr_count(intel_dp, lttpr_count); + if (intel_dp_is_uhbr(crtc_state)) passed = intel_dp_128b132b_link_train(intel_dp, crtc_state, lttpr_count); else -- 2.29.0
