[Intel-gfx] [PATCH 13/17] drm/i915: Reinitialize HPD after runtime D3

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Runtime suspends disabled all interrupts, so in order to get them back
fully we need to also do the HPD irq setup on runtime resume. Except
on VLV/CHV where the display interrupt initialization is part of the
display power well powerup.

Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index ce3bd0c..b4c0b58 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1552,6 +1552,15 @@ static int intel_runtime_resume(struct device *device)
 	gen6_update_ring_freq(dev);
 
 	intel_runtime_pm_enable_interrupts(dev_priv);
+
+	/*
+	 * On VLV/CHV display interrupts are part of the display
+	 * power well, so hpd is reinitialized from there. For
+	 * everyone else do it here.
+	 */
+	if (!IS_VALLEYVIEW(dev_priv))
+		intel_hpd_init(dev_priv);
+
 	intel_enable_gt_powersave(dev);
 
 	if (ret)
-- 
2.4.6