In order to avoid accessing GPU registers while GPU is suspended cancel the hangcheck work before calling intel_suspend_complete which actually puts the GPU to suspend. Otherwise hangcheck might do MMIO reads to a suspended GPU.
Placement before intel_guc_suspend is imitated from i915_drm_suspend which cancels the work at i915_gem_suspend, to keep the functions similar. On VLV systems, namely BYT, this was causing an error during runtime suspend cycle: [drm:vlv_check_no_gt_access [i915]] *ERROR* GT register access while GT waking disabled Testcase: igt/pm_rpm/basic-rte Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93121 Signed-off-by: Joonas Lahtinen <[email protected]> Cc: Imre Deak <[email protected]> Cc: Chris Wilson <[email protected]> --- drivers/gpu/drm/i915/i915_drv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index e6935f1..81862d5 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -1462,6 +1462,8 @@ static int intel_runtime_suspend(struct device *device) i915_gem_release_all_mmaps(dev_priv); mutex_unlock(&dev->struct_mutex); + cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work); + intel_guc_suspend(dev); intel_suspend_gt_powersave(dev); @@ -1475,7 +1477,6 @@ static int intel_runtime_suspend(struct device *device) return ret; } - cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work); intel_uncore_forcewake_reset(dev, false); dev_priv->pm.suspended = true; -- 2.4.3 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
