[PATCH v3 1/3] drm/i915/lspcon: Enable AUX interrupts for resume time initialization

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

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.

Cc: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: David Weinehall <david.weinehall@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1480448429-27739-1-git-send-email-imre.deak@intel.com
(rebased onto v4.10.4 due to missing s/dev/dev_priv/ upstream change)
(corrected stable tag)
Cc: <stable@vger.kernel.org> # v4.10
Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 728ca3e..f02da12 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1573,18 +1573,21 @@ static int i915_drm_resume(struct drm_device *dev)
 	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");
-- 
2.5.0