From: Swati Sharma <swati2.sharma@xxxxxxxxx>
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.
v4: Resused function to check frl which inturn restarts FRL and
fallback to TMDS mode.
Signed-off-by: Swati Sharma <swati2.sharma@xxxxxxxxx>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx> (v2)
---
drivers/gpu/drm/i915/display/intel_dp.c | 53 +++++++++++++++++++++++--
1 file changed, 50 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 1e0ff39bb927..66f35e7c9903 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -6013,6 +6013,28 @@ 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;
+
+ 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);
+
+ /* Restart FRL training or fall back to TMDS mode */
+ intel_dp_check_frl_training(intel_dp);
+ }
+}
+
static bool
intel_dp_needs_link_retrain(struct intel_dp *intel_dp)
{
@@ -6378,7 +6400,7 @@ 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;
@@ -6402,6 +6424,30 @@ 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:
@@ -6441,7 +6487,8 @@ 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);
@@ -6871,7 +6918,7 @@ 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)
--
2.17.1
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