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Revert "drm/i915: Avoid waking the engines just to check if they are idle"

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This reverts commit 0b702dca26.

CI reports that this is not as reliable as it first appears, with
failures starting to sporadically occur in selftests.

Fixes: 0b702dca26 ("drm/i915: Avoid waking the engines just to check if they are idle")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190227204654.14907-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-02-27 20:46:53 +00:00
parent 2d5eaad007
commit 44f8b8022d
1 changed files with 7 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/gpu/drm/i915/intel_engine_cs.c
View File

@ -1007,7 +1007,6 @@ static bool ring_is_idle(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->i915;
intel_wakeref_t wakeref;
unsigned long flags;
bool idle = true;
if (I915_SELFTEST_ONLY(!engine->mmio_base))
@ -1018,19 +1017,15 @@ static bool ring_is_idle(struct intel_engine_cs *engine)
if (!wakeref)
return true;
spin_lock_irqsave(&dev_priv->uncore.lock, flags);
/*
* Check that no commands are left in the ring.
*
* If the engine is not awake, both reads return 0 as we do so without
* forcewake.
*/
if ((I915_READ_FW(RING_HEAD(engine->mmio_base)) & HEAD_ADDR) !=
(I915_READ_FW(RING_TAIL(engine->mmio_base)) & TAIL_ADDR))
/* First check that no commands are left in the ring */
if ((I915_READ_HEAD(engine) & HEAD_ADDR) !=
(I915_READ_TAIL(engine) & TAIL_ADDR))
idle = false;
/* No bit for gen2, so assume the CS parser is idle */
if (INTEL_GEN(dev_priv) > 2 && !(I915_READ_MODE(engine) & MODE_IDLE))
idle = false;
spin_unlock_irqrestore(&dev_priv->uncore.lock, flags);
intel_runtime_pm_put(dev_priv, wakeref);
return idle;