Before sharing common parts between the system and runtime s/r handlers we WARNed if the runtime s/r handlers were called on GENs that didn't support RPM. But this WARN is not correct if the same handler is called from the system s/r path, since that can happen on any platform. This also broke system s/r on old platforms.
The issue was introduced in commit 016970beb05da6285c2f3ed2bee1c676cb75972e Author: Sagar Kamble <sagar.a.kam...@intel.com> Date: Wed Aug 13 23:07:06 2014 +0530 v2: - remove the WARN and depend on the HAS_RUNTIME_PM check in rutime_suspend/resume instead (Daniel) Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82751 Signed-off-by: Imre Deak <imre.d...@intel.com> --- drivers/gpu/drm/i915/i915_drv.c | 31 ++++++++++++++----------------- 1 file changed, 14 insertions(+), 17 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index de1b664..b5fd1c5 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1412,7 +1412,9 @@ static int intel_runtime_suspend(struct device *device) if (WARN_ON_ONCE(!(dev_priv->rps.enabled && intel_enable_rc6(dev)))) return -ENODEV; - WARN_ON(!HAS_RUNTIME_PM(dev)); + if (WARN_ON_ONCE(!HAS_RUNTIME_PM(dev))) + return -ENODEV; + assert_force_wake_inactive(dev_priv); DRM_DEBUG_KMS("Suspending device\n"); @@ -1480,7 +1482,8 @@ static int intel_runtime_resume(struct device *device) struct drm_i915_private *dev_priv = dev->dev_private; int ret; - WARN_ON(!HAS_RUNTIME_PM(dev)); + if (WARN_ON_ONCE(!HAS_RUNTIME_PM(dev))) + return -ENODEV; DRM_DEBUG_KMS("Resuming device\n"); @@ -1515,16 +1518,12 @@ static int intel_suspend_complete(struct drm_i915_private *dev_priv) struct drm_device *dev = dev_priv->dev; int ret; - if (IS_GEN6(dev)) { - ret = 0; - } else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) { + if (IS_HASWELL(dev) || IS_BROADWELL(dev)) ret = hsw_suspend_complete(dev_priv); - } else if (IS_VALLEYVIEW(dev)) { + else if (IS_VALLEYVIEW(dev)) ret = vlv_suspend_complete(dev_priv); - } else { - ret = -ENODEV; - WARN_ON(1); - } + else + ret = 0; return ret; } @@ -1540,16 +1539,14 @@ static int intel_resume_prepare(struct drm_i915_private *dev_priv, struct drm_device *dev = dev_priv->dev; int ret; - if (IS_GEN6(dev)) { + if (IS_GEN6(dev)) ret = snb_resume_prepare(dev_priv, rpm_resume); - } else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) { + else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) ret = hsw_resume_prepare(dev_priv, rpm_resume); - } else if (IS_VALLEYVIEW(dev)) { + else if (IS_VALLEYVIEW(dev)) ret = vlv_resume_prepare(dev_priv, rpm_resume); - } else { - WARN_ON(1); - ret = -ENODEV; - } + else + ret = 0; return ret; } -- 1.8.4 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
