From: Swati Sharma swati2.sharma@intel.com
In this patch enables support for detecting link failures between PCON and HDMI sink in i915 driver. HDMI link loss indication to upstream DP source is indicated via IRQ_HPD. This is followed by reading of HDMI link configuration status (HDMI_TX_LINK_ACTIVE_STATUS). If the PCON → HDMI 2.1 link status is off; reinitiate frl link training to recover. Also, report HDMI FRL link error count range for each individual FRL active lane is indicated by DOWNSTREAM_HDMI_ERROR_STATUS_LN registers.
v2: Checked for dpcd read and write failures and added debug message. (Uma Shankar) v3: rearranged code to re-start FRL link training or fall back to TMDS mode.
Signed-off-by: Swati Sharma swati2.sharma@intel.com Signed-off-by: Ankit Nautiyal ankit.k.nautiyal@intel.com Reviewed-by: Uma Shankar uma.shankar@intel.com --- drivers/gpu/drm/i915/display/intel_dp.c | 68 +++++++++++++++++++++++-- 1 file changed, 65 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 58c7e080d918..7d7010b148ec 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -6028,6 +6028,43 @@ intel_dp_check_mst_status(struct intel_dp *intel_dp) return link_ok; }
+static void +intel_dp_handle_hdmi_link_status_change(struct intel_dp *intel_dp) +{ + bool is_active; + u8 buf = 0; + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp); + + is_active = drm_dp_pcon_hdmi_link_active(&intel_dp->aux); + if (intel_dp->frl.is_trained && !is_active) { + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_PCON_HDMI_LINK_CONFIG_1, &buf) < 0) + return; + + buf &= ~DP_PCON_ENABLE_HDMI_LINK; + if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_PCON_HDMI_LINK_CONFIG_1, buf) < 0) + return; + + drm_dp_pcon_hdmi_frl_link_error_count(&intel_dp->aux, &intel_dp->attached_connector->base); + + intel_dp->frl.is_trained = false; + intel_dp->frl.trained_rate_gbps = 0; + + /* Restart FRL training or fall back to TMDS mode */ + if (intel_dp_pcon_start_frl_training(intel_dp) < 0) { + int ret, mode; + + drm_dbg(&dev_priv->drm, "Couldnt restart FRL, continuing with TMDS mode\n"); + ret = drm_dp_pcon_reset_frl_config(&intel_dp->aux); + mode = drm_dp_pcon_hdmi_link_mode(&intel_dp->aux, NULL); + + if (ret < 0 || mode != DP_PCON_HDMI_MODE_TMDS) + drm_dbg(&dev_priv->drm, "Issue with PCON, cannot set TMDS mode\n"); + } else { + drm_dbg(&dev_priv->drm, "FRL Re-training Completed\n"); + } + } +} + static bool intel_dp_needs_link_retrain(struct intel_dp *intel_dp) { @@ -6393,7 +6430,7 @@ intel_dp_hotplug(struct intel_encoder *encoder, return state; }
-static void intel_dp_check_service_irq(struct intel_dp *intel_dp) +static void intel_dp_check_device_service_irq(struct intel_dp *intel_dp) { struct drm_i915_private *i915 = dp_to_i915(intel_dp); u8 val; @@ -6417,6 +6454,30 @@ static void intel_dp_check_service_irq(struct intel_dp *intel_dp) drm_dbg_kms(&i915->drm, "Sink specific irq unhandled\n"); }
+static void intel_dp_check_link_service_irq(struct intel_dp *intel_dp) +{ + struct drm_i915_private *i915 = dp_to_i915(intel_dp); + u8 val; + + if (intel_dp->dpcd[DP_DPCD_REV] < 0x11) + return; + + if (drm_dp_dpcd_readb(&intel_dp->aux, + DP_LINK_SERVICE_IRQ_VECTOR_ESI0, &val) != 1 || !val) { + drm_dbg_kms(&i915->drm, "Error in reading link service irq vector\n"); + return; + } + + if (drm_dp_dpcd_writeb(&intel_dp->aux, + DP_LINK_SERVICE_IRQ_VECTOR_ESI0, val) != 1) { + drm_dbg_kms(&i915->drm, "Error in writing link service irq vector\n"); + return; + } + + if (val & HDMI_LINK_STATUS_CHANGED) + intel_dp_handle_hdmi_link_status_change(intel_dp); +} + /* * According to DP spec * 5.1.2: @@ -6456,7 +6517,8 @@ intel_dp_short_pulse(struct intel_dp *intel_dp) return false; }
- intel_dp_check_service_irq(intel_dp); + intel_dp_check_device_service_irq(intel_dp); + intel_dp_check_link_service_irq(intel_dp);
/* Handle CEC interrupts, if any */ drm_dp_cec_irq(&intel_dp->aux); @@ -6890,7 +6952,7 @@ intel_dp_detect(struct drm_connector *connector, to_intel_connector(connector)->detect_edid) status = connector_status_connected;
- intel_dp_check_service_irq(intel_dp); + intel_dp_check_device_service_irq(intel_dp);
out: if (status != connector_status_connected && !intel_dp->is_mst)