According to BSpec this flag should not be changed while the DDI function is enabled. On BDW+ the DP_TP_CTL register spec also states it explicitly that the HW takes care of enabling/disabling the scrambling for training patterns (and it must stay enabled for normal pixel output). Assume that this HW automatic handling of scrambling is also true for HSW.
BSpec: 8013, 7557, 50484 Signed-off-by: Imre Deak <[email protected]> --- drivers/gpu/drm/i915/display/intel_ddi.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index 2c484b55bcdf..c467f18d5e1b 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -4037,8 +4037,7 @@ static void intel_ddi_prepare_link_retrain(struct intel_dp *intel_dp) intel_wait_ddi_buf_idle(dev_priv, port); } - dp_tp_ctl = DP_TP_CTL_ENABLE | - DP_TP_CTL_LINK_TRAIN_PAT1 | DP_TP_CTL_SCRAMBLE_DISABLE; + dp_tp_ctl = DP_TP_CTL_ENABLE | DP_TP_CTL_LINK_TRAIN_PAT1; if (intel_dp->link_mst) dp_tp_ctl |= DP_TP_CTL_MODE_MST; else { @@ -4066,11 +4065,6 @@ static void intel_ddi_set_link_train(struct intel_dp *intel_dp, temp = intel_de_read(dev_priv, intel_dp->regs.dp_tp_ctl); - if (dp_train_pat & DP_LINK_SCRAMBLING_DISABLE) - temp |= DP_TP_CTL_SCRAMBLE_DISABLE; - else - temp &= ~DP_TP_CTL_SCRAMBLE_DISABLE; - temp &= ~DP_TP_CTL_LINK_TRAIN_MASK; switch (dp_train_pat & train_pat_mask) { case DP_TRAINING_PATTERN_DISABLE: -- 2.23.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
