[Intel-gfx] [PATCH] drm/i915: Check idle to active before processing CSQ

[Mika Kuoppala]

If idle to active bit is set, the rest of the fields
in CSQ are not valid.

Bail out early if this is the case in order to prevent
rest of the loop inspecting stale values.

Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 99bba8e..96218bf 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -497,6 +497,9 @@ void intel_lrc_irq_handler(struct intel_engine_cs *ring)
 		status_id = I915_READ(RING_CONTEXT_STATUS_BUF(ring) +
 				(read_pointer % 6) * 8 + 4);
 
+		if (status & GEN8_CTX_STATUS_IDLE_ACTIVE)
+			continue;
+
 		if (status & GEN8_CTX_STATUS_PREEMPTED) {
 			if (status & GEN8_CTX_STATUS_LITE_RESTORE) {
 				if (execlists_check_remove_request(ring, status_id))
-- 
2.1.4