drm/i915: Re-apply "Perform link quality check, unconditionally during long pulse"

This re-applies the workaround for "some DP sinks, [which] are a
little nuts" from commit 1a36147bb939 ("drm/i915: Perform link
quality check unconditionally during long pulse").
It makes the secondary AOC E2460P monitor connected via DP to an
acer Veriton N4640G usable again.

This hunk was dropped in commit c85d200e8321 ("drm/i915: Move SST
DP link retraining into the ->post_hotplug() hook")

Fixes: c85d200e8321 ("drm/i915: Move SST DP link retraining into the ->post_hotplug() hook")
[Cleaned up commit message, added stable cc]
Signed-off-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Jan-Marek Glogowski <glogow@fbihome.de>
Cc: stable@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20180825191035.3945-1-lyude@redhat.com

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index b3f6f04c3c7de64ddb6bb7801e742f3b0d6fe3fb..db8515171270a62feea430b7e505a4a8424c9198 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4333,18 +4333,6 @@ intel_dp_needs_link_retrain(struct intel_dp *intel_dp)
        return !drm_dp_channel_eq_ok(link_status, intel_dp->lane_count);
 }
 
-/*
- * 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.
- */
 int intel_dp_retrain_link(struct intel_encoder *encoder,
                          struct drm_modeset_acquire_ctx *ctx)
 {
@@ -5031,7 +5019,8 @@ intel_dp_unset_edid(struct intel_dp *intel_dp)
 }
 
 static int
-intel_dp_long_pulse(struct intel_connector *connector)
+intel_dp_long_pulse(struct intel_connector *connector,
+                   struct drm_modeset_acquire_ctx *ctx)
 {
        struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
        struct intel_dp *intel_dp = intel_attached_dp(&connector->base);
@@ -5090,6 +5079,22 @@ intel_dp_long_pulse(struct intel_connector *connector)
                 */
                status = connector_status_disconnected;
                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.
+                */
+               struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
+
+               intel_dp_retrain_link(encoder, ctx);
        }
 
        /*
@@ -5151,7 +5156,7 @@ intel_dp_detect(struct drm_connector *connector,
                                return ret;
                }
 
-               status = intel_dp_long_pulse(intel_dp->attached_connector);
+               status = intel_dp_long_pulse(intel_dp->attached_connector, ctx);
        }
 
        intel_dp->detect_done = false;