Patch "drm/i915/edp: Get the Panel Power Off timestamp after panel is off" has been added to the 4.13-stable tree

This is a note to let you know that I've just added the patch titled

drm/i915/edp: Get the Panel Power Off timestamp after panel is off

to the 4.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
drm-i915-edp-get-the-panel-power-off-timestamp-after-panel-is-off.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Manasi Navare <[email protected]>
Date: Wed, 4 Oct 2017 09:48:26 -0700
Subject: drm/i915/edp: Get the Panel Power Off timestamp after panel is off

From: Manasi Navare <[email protected]>

commit d7ba25bd9ef802ff02414e9105f4222d1795f27a upstream.

Kernel stores the time in jiffies at which the eDP panel is turned off. This should be obtained after the panel is off (after the wait_panel_off). When we next attempt to turn the panel on, we use the difference between the timestamp at which we want to turn the panel on and timestamp at which panel was turned off to ensure that this is equal to panel power cycle delay and if not we wait for the remaining time. Not waiting for the panel power cycle delay can cause the panel to not turn on giving rise to AUX timeouts for the attempted AUX transactions.

v2:
* Separate lines for bugzilla (Jani Nikula)
* Suggested by tag (Daniel Vetter)

Cc: Daniel Vetter <[email protected]>
Cc: Jani Nikula <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101518
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101144

---
 drivers/gpu/drm/i915/intel_dp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -2263,8 +2263,8 @@ static void edp_panel_off(struct intel_d
 	I915_WRITE(pp_ctrl_reg, pp);
 	POSTING_READ(pp_ctrl_reg);
 
-	intel_dp->panel_power_off_time = ktime_get_boottime();
 	wait_panel_off(intel_dp);
+	intel_dp->panel_power_off_time = ktime_get_boottime();
 
 	/* We got a reference when we enabled the VDD. */
 	intel_display_power_put(dev_priv, intel_dp->aux_power_domain);

Patches currently in stable-queue which might be from [email protected] are

queue-4.13/drm-i915-edp-get-the-panel-power-off-timestamp-after-panel-is-off.patch