[PATCH 13/17] drm/i915: Update intel_dp_hpd_pulse() to check link status for non-MST operation

[Todd Previte <tprevite@gmail.com>]

Moves the non-MST case out of the if-statement and places it at the beginning
of the function to handle HPD events for SST mode. The reasoning behind this
is to accommodate link status checks for compliance testing. Some test devices
use long pulses to perform test requests so link status must be checked
regardless of the pulse width for the SST operational mode.

This patch replaces [PATCH 10/10] drm/i915: Fix intel_dp_hot_plug() in the
previous compliance testing patch sequence. Review feedback on that patch
indicated that updating intel_dp_hot_plug() was not the correct place for
the test handler.

Signed-off-by: Todd Previte <tprevite@gmail.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 4a55ca6..73014d8 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4613,6 +4613,18 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
 	power_domain = intel_display_port_power_domain(intel_encoder);
 	intel_display_power_get(dev_priv, power_domain);
 
+	if (!intel_dp->is_mst) {
+		/*
+		 *  Pulse width doesn't matter for SST mode
+		 *  Handle the HPD event now
+		*/
+		drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
+		intel_dp_check_link_status(intel_dp);
+		drm_modeset_unlock(&dev->mode_config.connection_mutex);
+		ret = false;
+		goto put_power;
+	}
+
 	if (long_hpd) {
 
 		if (HAS_PCH_SPLIT(dev)) {
@@ -4637,16 +4649,6 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
 			if (intel_dp_check_mst_status(intel_dp) == -EINVAL)
 				goto mst_fail;
 		}
-
-		if (!intel_dp->is_mst) {
-			/*
-			 * we'll check the link status via the normal hot plug path later -
-			 * but for short hpds we should check it now
-			 */
-			drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
-			intel_dp_check_link_status(intel_dp);
-			drm_modeset_unlock(&dev->mode_config.connection_mutex);
-		}
 	}
 	ret = false;
 	goto put_power;
-- 
1.9.1

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