[Intel-gfx] [PATCH v3] drm/i915/display: Don't disable DDI/Transcoder when setting phy test pattern

[Khaled Almahallawy]

Bspecs has 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.

v2: Update commit message (Clint)
v3: Add missing Signed-off in v2

Bspec: 50482
Cc: Imre Deak <imre.deak at intel.com>
Cc: Clint Taylor <clinton.a.taylor at intel.com>
CC: Jani Nikula <jani.nikula at intel.com>
Tested-by: Khaled Almahallawy <khaled.almahallawy at intel.com>
Signed-off-by: Khaled Almahallawy <khaled.almahallawy at intel.com>
Reviewed-by: Clint Taylor <clinton.a.taylor 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 914161d7d122..16cf961b4d1a 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -3679,61 +3679,6 @@ 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)
 {
@@ -3752,14 +3697,10 @@ 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