Commit 031a8936 authored by Mika Kuoppala's avatar Mika Kuoppala Committed by Daniel Vetter

drm/i915: Check idle to active before processing CSQ

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.

This was found by Bspec/code inspection. Doesn't seem to fix any of
the known issues.
Signed-off-by: default avatarMika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: default avatarArun Siluvery <arun.siluvery@linux.intel.com>
[danvet: Add note about how this was found.]
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 500ea70d
......@@ -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))
......
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