Some panels generate long HPD events even while connected to
the port. This cause some unexpected CI execution issues. A
new flag is added to track if such spurious long HPDs can be
ignored and are not processed further if the flag is set.
Signed-off-by: Vinod Govindapillai <vinod.govindapillai@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_display_core.h | 11 +++++++++++
drivers/gpu/drm/i915/display/intel_dp.c | 7 +++++++
2 files changed, 18 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_display_core.h b/drivers/gpu/drm/i915/display/intel_display_core.h
index 96cf994b0ad1..f84a2e760ef4 100644
--- a/drivers/gpu/drm/i915/display/intel_display_core.h
+++ b/drivers/gpu/drm/i915/display/intel_display_core.h
@@ -170,6 +170,17 @@ struct intel_hotplug {
* blocked behind the non-DP one.
*/
struct workqueue_struct *dp_wq;
+
+ /*
+ * Flag to track if long HPDs need not to be processed
+ *
+ * Some panels generate long HPDs while keep connected to the port.
+ * This can cause issues with CI tests results. In CI systems we
+ * don't expect to disconnect the panels and could ignore the long
+ * HPDs generated from the faulty panels. This flag can be used as
+ * cue to ignore the long HPDs and can be set / unset using debugfs.
+ */
+ bool ignore_long_hpd;
};
struct intel_vbt_data {
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 70b06806ec0d..87a0d01d8003 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -5092,6 +5092,13 @@ intel_dp_hpd_pulse(struct intel_digital_port *dig_port, bool long_hpd)
return IRQ_HANDLED;
}
+ if (i915->display.hotplug.ignore_long_hpd && long_hpd) {
+ drm_dbg_kms(&i915->drm, "[ENCODER:%d:%s] ignoring long hpd\n",
+ dig_port->base.base.base.id,
+ dig_port->base.base.name);
+ return IRQ_HANDLED;
+ }
+
drm_dbg_kms(&i915->drm, "got hpd irq on [ENCODER:%d:%s] - %s\n",
dig_port->base.base.base.id,
dig_port->base.base.name,
--
2.34.1
