Patch "drm/i915/lspcon: Enable AUX interrupts for resume time initialization" has been added to the 4.10-stable tree

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

drm/i915/lspcon: Enable AUX interrupts for resume time initialization

to the 4.10-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-lspcon-enable-aux-interrupts-for-resume-time-initialization.patch
and it can be found in the queue-4.10 subdirectory.

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

From: Imre Deak <[email protected]>
Date: Tue, 29 Nov 2016 21:40:29 +0200
Subject: drm/i915/lspcon: Enable AUX interrupts for resume time initialization
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Imre Deak <[email protected]>

commit 908764f6d0bd1ba496cb8da33b9b98297ed27351 upstream.

For LSPCON initialization during system resume we need AUX functionality, but we call the corresponding encoder reset hook with all interrupts disabled. Without interrupts we'll do a poll-wait for AUX transfer completions, which adds a significant delay if the transfers timeout/need to be retried for some reason.

Fix this by enabling interrupts before calling the reset hooks. Note that while this will enable AUX interrupts it will keep HPD interrupts disabled, in a similar way to the init time output setup code.

This issue existed since LSPCON support was added.

v2:
- Rebased on drm-tip.

(rebased onto v4.10.4 due to missing s/dev/dev_priv/ upstream change) (corrected stable tag)

---
 drivers/gpu/drm/i915/i915_drv.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

@@ -1573,18 +1573,21 @@ static int i915_drm_resume(struct drm_de
 	intel_opregion_setup(dev_priv);
 
 	intel_init_pch_refclk(dev);
-	drm_mode_config_reset(dev);
 
 	/*
 	 * Interrupts have to be enabled before any batches are run. If not the
 	 * GPU will hang. i915_gem_init_hw() will initiate batches to
 	 * update/restore the context.
 	 *
+	 * drm_mode_config_reset() needs AUX interrupts.
+	 *
 	 * Modeset enabling in intel_modeset_init_hw() also needs working
 	 * interrupts.
 	 */
 	intel_runtime_pm_enable_interrupts(dev_priv);
 
+	drm_mode_config_reset(dev);
+
 	mutex_lock(&dev->struct_mutex);
 	if (i915_gem_init_hw(dev)) {
 		DRM_ERROR("failed to re-initialize GPU, declaring wedged!\n");

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

queue-4.10/drm-i915-lspcon-fix-resume-time-initialization-due-to-unasserted-hpd.patch queue-4.10/drm-i915-lspcon-enable-aux-interrupts-for-resume-time-initialization.patch queue-4.10/drm-i915-gen9-enable-hotplug-detection-early.patch