Commit 364aece0 authored by Peter Antoine's avatar Peter Antoine Committed by Jani Nikula

drm/i915: Avoid GPU hang when coming out of s3 or s4

This patch fixes a timing issue that causes a GPU hang when the system
comes out of power saving.

During pm_resume, We are submitting batchbuffers before enabling
Interrupts this is causing us to miss the context switch interrupt,
and in consequence intel_execlists_handle_ctx_events is not triggered.

This patch is based on a patch from Deepak S <deepak.s@intel.com>
from another platform.

The patch fixes an issue introduced by:
  commit e7778be1
  drm/i915: Fix startup failure in LRC mode after recent init changes

The above patch added a call to init_context() to fix an issue introduced
by a previous patch. But, it then opened up a small timing window for the
batches being added by the init_context (basically setting up the context)
to complete before the interrupts have been turned on, thus hanging the
GPU.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89600
Cc: stable@vger.kernel.org # 4.0+
Signed-off-by: default avatarPeter Antoine <peter.antoine@intel.com>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
[Jani: fixed typo in subject, massaged the comments a bit]
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
parent 030bbdbf
......@@ -699,6 +699,16 @@ static int i915_drm_resume(struct drm_device *dev)
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.
*
* Modeset enabling in intel_modeset_init_hw() also needs working
* interrupts.
*/
intel_runtime_pm_enable_interrupts(dev_priv);
mutex_lock(&dev->struct_mutex);
if (i915_gem_init_hw(dev)) {
DRM_ERROR("failed to re-initialize GPU, declaring wedged!\n");
......@@ -706,9 +716,6 @@ static int i915_drm_resume(struct drm_device *dev)
}
mutex_unlock(&dev->struct_mutex);
/* We need working interrupts for modeset enabling ... */
intel_runtime_pm_enable_interrupts(dev_priv);
intel_modeset_init_hw(dev);
spin_lock_irq(&dev_priv->irq_lock);
......
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