drm/i915/display: Don't disable DDI/Transcoder when setting phy test pattern

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
v4: Update Bspec and commit message for pre-gen12 (Jani)

Bspec: 50482, 7555
Fixes: 8cdf72711928 ("drm/i915/dp: Program vswing, pre-emphasis, test-pattern")
Cc: Imre Deak <imre.deak@intel.com>
Cc: Clint Taylor <clinton.a.taylor@intel.com>
CC: Jani Nikula <jani.nikula@intel.com>
Tested-by: Khaled Almahallawy <khaled.almahallawy@intel.com>
Reviewed-by: Clint Taylor <clinton.a.taylor@intel.com>
Signed-off-by: Khaled Almahallawy <khaled.almahallawy@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221123220926.170034-1-khaled.almahallawy@intel.com
(cherry picked from commit be4a847652056b067d6dc6fe0fc024a9e2e987ca)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 67089711d9e25d265ccf0e6d6bf663e7a2a64bae..75070eb07d4bfa97587a173b29fb25582cd00389 100644 (file)
--- 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);