[PATCH v3 3/3] drm/i915/lspcon: Fix resume time initialization due to unasserted HPD

[Imre Deak <imre.deak@intel.com>]

commit 4b84b4a5507913ee0da27b1f1b27671937839de6 upstream.

During system resume time initialization the HPD level on LSPCON ports
can stay low for an extended amount of time, leading to failed AUX
transfers and LSPCON initialization. Fix this by waiting for HPD to get
asserted.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99178
Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1485509961-9010-3-git-send-email-imre.deak@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
(corrected stable tag)
Cc: <stable@vger.kernel.org> # v4.10
Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c     | 4 ++--
 drivers/gpu/drm/i915/intel_drv.h    | 2 ++
 drivers/gpu/drm/i915/intel_lspcon.c | 5 ++++-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 4daf7dd..c3ab024 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4289,8 +4289,8 @@ static bool bxt_digital_port_connected(struct drm_i915_private *dev_priv,
  *
  * Return %true if @port is connected, %false otherwise.
  */
-static bool intel_digital_port_connected(struct drm_i915_private *dev_priv,
-					 struct intel_digital_port *port)
+bool intel_digital_port_connected(struct drm_i915_private *dev_priv,
+				  struct intel_digital_port *port)
 {
 	if (HAS_PCH_IBX(dev_priv))
 		return ibx_digital_port_connected(dev_priv, port);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 03a2112..a0af54b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1451,6 +1451,8 @@ bool intel_dp_read_dpcd(struct intel_dp *intel_dp);
 bool __intel_dp_read_desc(struct intel_dp *intel_dp,
 			  struct intel_dp_desc *desc);
 bool intel_dp_read_desc(struct intel_dp *intel_dp);
+bool intel_digital_port_connected(struct drm_i915_private *dev_priv,
+				  struct intel_digital_port *port);
 
 /* intel_dp_aux_backlight.c */
 int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector);
diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
index daa5234..1269561 100644
--- a/drivers/gpu/drm/i915/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/intel_lspcon.c
@@ -100,6 +100,8 @@ static bool lspcon_probe(struct intel_lspcon *lspcon)
 static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
 {
 	struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon);
+	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
 	unsigned long start = jiffies;
 
 	if (!lspcon->desc_valid)
@@ -115,7 +117,8 @@ static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon)
 		if (!__intel_dp_read_desc(intel_dp, &desc))
 			return;
 
-		if (!memcmp(&intel_dp->desc, &desc, sizeof(desc))) {
+		if (intel_digital_port_connected(dev_priv, dig_port) &&
+		    !memcmp(&intel_dp->desc, &desc, sizeof(desc))) {
 			DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %u ms\n",
 				      jiffies_to_msecs(jiffies - start));
 			return;
-- 
2.5.0