From 10018603a481e4c1067e825e449f2e19dd737095 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Fri, 6 Jun 2014 12:59:39 +0300 Subject: [PATCH] drm/i915: preserve user forcewake over system suspend/resume Atm, the forcewake refcount will be incorrectly set to zero during system suspend if there is any reference held via the i915_forcewake_user debugfs entry. Fix this by simply not zeroing the sw counters during suspend and restoring the original state using them. Note that the only other places where we zeroed the counters were driver load and unload time, where it was redundant anyway. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78059 Signed-off-by: Imre Deak Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_drv.c | 2 +- drivers/gpu/drm/i915/i915_drv.h | 3 ++- drivers/gpu/drm/i915/intel_uncore.c | 10 +++------- 3 files changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 615b62f0541d..5a08c86cb1ab 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -600,7 +600,7 @@ static int i915_drm_thaw_early(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; - intel_uncore_early_sanitize(dev); + intel_uncore_early_sanitize(dev, true); intel_uncore_sanitize(dev); intel_power_domains_init_hw(dev_priv); diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index c565e7350c8c..eea98f47f0b0 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2078,7 +2078,8 @@ extern void intel_irq_init(struct drm_device *dev); extern void intel_hpd_init(struct drm_device *dev); extern void intel_uncore_sanitize(struct drm_device *dev); -extern void intel_uncore_early_sanitize(struct drm_device *dev); +extern void intel_uncore_early_sanitize(struct drm_device *dev, + bool restore_forcewake); extern void intel_uncore_init(struct drm_device *dev); extern void intel_uncore_check_errors(struct drm_device *dev); extern void intel_uncore_fini(struct drm_device *dev); diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index 6a7307812881..11cc7926ef98 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -358,16 +358,12 @@ static void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore) dev_priv->uncore.fifo_count = __raw_i915_read32(dev_priv, GTFIFOCTL) & GT_FIFO_FREE_ENTRIES_MASK; - } else { - dev_priv->uncore.forcewake_count = 0; - dev_priv->uncore.fw_rendercount = 0; - dev_priv->uncore.fw_mediacount = 0; } spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); } -void intel_uncore_early_sanitize(struct drm_device *dev) +void intel_uncore_early_sanitize(struct drm_device *dev, bool restore_forcewake) { struct drm_i915_private *dev_priv = dev->dev_private; @@ -390,7 +386,7 @@ void intel_uncore_early_sanitize(struct drm_device *dev) __raw_i915_write32(dev_priv, GTFIFODBG, __raw_i915_read32(dev_priv, GTFIFODBG)); - intel_uncore_forcewake_reset(dev, false); + intel_uncore_forcewake_reset(dev, restore_forcewake); } void intel_uncore_sanitize(struct drm_device *dev) @@ -821,7 +817,7 @@ void intel_uncore_init(struct drm_device *dev) setup_timer(&dev_priv->uncore.force_wake_timer, gen6_force_wake_timer, (unsigned long)dev_priv); - intel_uncore_early_sanitize(dev); + intel_uncore_early_sanitize(dev, false); if (IS_VALLEYVIEW(dev)) { dev_priv->uncore.funcs.force_wake_get = __vlv_force_wake_get; -- 2.39.5