[Intel-gfx] [PATCH] drm/i915/display: Don't disable DDI/Transcoder when setting phy test pattern

[Khaled Almahallawy]

Spec:50482 updated recently to remove the restriction to disable
DDI/Transcoder before setting PHY test pattern. This update is to
address PHY compliance test failures observed on a port with LTTPR.
The issue is that when Transc. is disabled, the main link signals fed
to LTTPR will be dropped invalidating link training, which will affect
the quality of the phy test pattern when the transcoder is enabled again.

This specs change also exists in Windows driver since very long time
and proved to work in legacy linux phy compliance solution since Gen9.

Cc: Imre Deak <imre.deak at intel.com>
Cc: Clint Taylor <clinton.a.taylor at intel.com>
Cc: Or Cochvi <or.cochvi at intel.com>
Tested-by: Khaled Almahallawy <khaled.almahallawy at intel.com>
Signed-off-by: Khaled Almahallawy <khaled.almahallawy at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 59 -------------------------
 1 file changed, 59 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index c9be61d2348e..2bf323f3f155 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -3675,61 +3675,6 @@ static void intel_dp_phy_pattern_update(struct intel_dp *intel_dp,
 	}
 }
 
-static void
-intel_dp_autotest_phy_ddi_disable(struct intel_dp *intel_dp,
-				  const struct intel_crtc_state *crtc_state)
-{
-	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
-	struct drm_device *dev = dig_port->base.base.dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc);
-	enum pipe pipe = crtc->pipe;
-	u32 trans_ddi_func_ctl_value, trans_conf_value, dp_tp_ctl_value;
-
-	trans_ddi_func_ctl_value = intel_de_read(dev_priv,
-						 TRANS_DDI_FUNC_CTL(pipe));
-	trans_conf_value = intel_de_read(dev_priv, PIPECONF(pipe));
-	dp_tp_ctl_value = intel_de_read(dev_priv, TGL_DP_TP_CTL(pipe));
-
-	trans_ddi_func_ctl_value &= ~(TRANS_DDI_FUNC_ENABLE |
-				      TGL_TRANS_DDI_PORT_MASK);
-	trans_conf_value &= ~PIPECONF_ENABLE;
-	dp_tp_ctl_value &= ~DP_TP_CTL_ENABLE;
-
-	intel_de_write(dev_priv, PIPECONF(pipe), trans_conf_value);
-	intel_de_write(dev_priv, TRANS_DDI_FUNC_CTL(pipe),
-		       trans_ddi_func_ctl_value);
-	intel_de_write(dev_priv, TGL_DP_TP_CTL(pipe), dp_tp_ctl_value);
-}
-
-static void
-intel_dp_autotest_phy_ddi_enable(struct intel_dp *intel_dp,
-				 const struct intel_crtc_state *crtc_state)
-{
-	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
-	struct drm_device *dev = dig_port->base.base.dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	enum port port = dig_port->base.port;
-	struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc);
-	enum pipe pipe = crtc->pipe;
-	u32 trans_ddi_func_ctl_value, trans_conf_value, dp_tp_ctl_value;
-
-	trans_ddi_func_ctl_value = intel_de_read(dev_priv,
-						 TRANS_DDI_FUNC_CTL(pipe));
-	trans_conf_value = intel_de_read(dev_priv, PIPECONF(pipe));
-	dp_tp_ctl_value = intel_de_read(dev_priv, TGL_DP_TP_CTL(pipe));
-
-	trans_ddi_func_ctl_value |= TRANS_DDI_FUNC_ENABLE |
-				    TGL_TRANS_DDI_SELECT_PORT(port);
-	trans_conf_value |= PIPECONF_ENABLE;
-	dp_tp_ctl_value |= DP_TP_CTL_ENABLE;
-
-	intel_de_write(dev_priv, PIPECONF(pipe), trans_conf_value);
-	intel_de_write(dev_priv, TGL_DP_TP_CTL(pipe), dp_tp_ctl_value);
-	intel_de_write(dev_priv, TRANS_DDI_FUNC_CTL(pipe),
-		       trans_ddi_func_ctl_value);
-}
-
 static void intel_dp_process_phy_request(struct intel_dp *intel_dp,
 					 const struct intel_crtc_state *crtc_state)
 {
@@ -3748,14 +3693,10 @@ static void intel_dp_process_phy_request(struct intel_dp *intel_dp,
 	intel_dp_get_adjust_train(intel_dp, crtc_state, DP_PHY_DPRX,
 				  link_status);
 
-	intel_dp_autotest_phy_ddi_disable(intel_dp, crtc_state);
-
 	intel_dp_set_signal_levels(intel_dp, crtc_state, DP_PHY_DPRX);
 
 	intel_dp_phy_pattern_update(intel_dp, crtc_state);
 
-	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);
 
-- 
2.25.1