[Intel-gfx] [PATCH] drm/i915: reboot notifier delay for eDP panels

[clinton.a.taylor at intel.com]

From: Clint Taylor <clinton.a.taylor at intel.com>

Add reboot notifier for all platforms. This guarantees T12 delay
compliance during reboot cycles when pre-os enables the panel within
500ms.

Signed-off-by: Clint Taylor <clinton.a.taylor at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 796e3d3..dbbd27a 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -126,6 +126,7 @@ static struct intel_dp *intel_attached_dp(struct drm_connector *connector)
 static void intel_dp_link_down(struct intel_dp *intel_dp);
 static bool edp_panel_vdd_on(struct intel_dp *intel_dp);
 static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync);
+static void edp_panel_off(struct intel_dp *intel_dp);
 static void vlv_init_panel_power_sequencer(struct intel_dp *intel_dp);
 static void vlv_steal_power_sequencer(struct drm_device *dev,
 				      enum pipe pipe);
@@ -596,6 +597,10 @@ static int edp_notify_handler(struct notifier_block *this, unsigned long code,
 		I915_WRITE(pp_ctrl_reg, PANEL_UNLOCK_REGS | PANEL_POWER_OFF);
 		msleep(intel_dp->panel_power_cycle_delay);
 	}
+	else
+	{
+		edp_panel_off(intel_dp);
+	}
 
 	pps_unlock(intel_dp);
 
@@ -5796,10 +5801,10 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 	}
 	mutex_unlock(&dev->mode_config.mutex);
 
-	if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
-		intel_dp->edp_notifier.notifier_call = edp_notify_handler;
-		register_reboot_notifier(&intel_dp->edp_notifier);
+	intel_dp->edp_notifier.notifier_call = edp_notify_handler;
+	register_reboot_notifier(&intel_dp->edp_notifier);
 
+	if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
 		/*
 		 * Figure out the current pipe for the initial backlight setup.
 		 * If the current pipe isn't valid, try the PPS pipe, and if that
-- 
1.7.9.5