From 9486db611ca69ea67b6f4285fbb8afeb34585571 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Tue, 22 Apr 2014 20:21:07 +0300 Subject: [PATCH] drm/i915: reinit GT power save during resume MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit During runtime suspend there can be a last pending rps.work, so make sure it's canceled. Note that in the runtime suspend callback we can't get any RPS interrupts since it's called only after the GPU goes idle and we set the minimum RPS frequency. The next possibility for an RPS interrupt is only after getting an RPM ref (for example because of a new GPU command) and calling the RPM resume callback. v2: - patch introduced in v2 of the patchset v3: - Change the order of canceling the rps.work and disabling interrupts to avoid the race between interrupt disabling and the the rps.work. Race spotted by Ville. Signed-off-by: Imre Deak Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_drv.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 114598d7f52e..e3c9c44e4bc4 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -947,6 +947,12 @@ static int intel_runtime_suspend(struct device *device) DRM_DEBUG_KMS("Suspending device\n"); + /* + * rps.work can't be rearmed here, since we get here only after making + * sure the GPU is idle and the RPS freq is set to the minimum. See + * intel_mark_idle(). + */ + cancel_work_sync(&dev_priv->rps.work); intel_runtime_pm_disable_interrupts(dev); if (IS_GEN6(dev)) @@ -998,6 +1004,7 @@ static int intel_runtime_resume(struct device *device) gen6_update_ring_freq(dev); intel_runtime_pm_restore_interrupts(dev); + intel_reset_gt_powersave(dev); DRM_DEBUG_KMS("Device resumed\n"); return 0; -- 2.20.1