Comment claims link needs to be retrained because the connected sink raised
a long pulse to indicate link loss. If the sink did so,
intel_dp_hotplug() would have handled link retraining. Looking at the
logs in Bugzilla referenced in commit '3cf71bc9904d ("drm/i915: Re-apply
Perform link quality check, unconditionally during long pulse"")', the
issue is that the sink does not trigger an interrupt. We want the
->detect() from user space to check link status and retrain. Ville's
review for the original patch also indicates the same root cause.
I have also renamed long_pulse() to full_detect().
v2: Patch split and rewrote comment..
Cc: Lyude Paul <ly...@redhat.com>
Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
Cc: Jani Nikula <jani.nik...@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Cc: Jan-Marek Glogowski <glo...@fbihome.de>
References: 3cf71bc9904d ("drm/i915: Re-apply "Perform link quality check,
unconditionally during long pulse"")
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 12 ++----------
1 file changed, 2 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 436c22de33b6..cac1c7c6cbfd 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5074,16 +5074,8 @@ intel_dp_long_pulse(struct intel_connector *connector,
goto out;
} else {
/*
- * If display is now connected check links status,
- * there has been known issues of link loss triggering
- * long pulse.
- *
- * Some sinks (eg. ASUS PB287Q) seem to perform some
- * weird HPD ping pong during modesets. So we can apparently
- * end up with HPD going low during a modeset, and then
- * going back up soon after. And once that happens we must
- * retrain the link to get a picture. That's in case no
- * userspace component reacted to intermittent HPD dip.
+ * Some monitors do not signal loss of link synchronization
+ * with an IRQ_HPD, so force a link status check.
*/
struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
--
2.14.1
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