From: Ben Widawsky <benjamin.widaw...@linux.intel.com>
This is needed to implement ipehr_is_semaphore_wait
Signed-off-by: Ben Widawsky <b...@bwidawsk.net>
---
drivers/gpu/drm/i915/i915_irq.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 2d76183..bfd21c7 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2561,12 +2561,9 @@ static bool
ipehr_is_semaphore_wait(struct drm_device *dev, u32 ipehr)
{
if (INTEL_INFO(dev)->gen >= 8) {
- /*
- * FIXME: gen8 semaphore support - currently we don't emit
- * semaphores on bdw anyway, but this needs to be addressed when
- * we merge that code.
- */
- return false;
+ /* Broadwell's semaphore wait is 3 dwords. We hope IPEHR is the
+ * first dword. */
+ return (ipehr >> 23) == 0x1c;
} else {
ipehr &= ~MI_SEMAPHORE_SYNC_MASK;
return ipehr == (MI_SEMAPHORE_MBOX | MI_SEMAPHORE_COMPARE |
@@ -2586,6 +2583,8 @@ semaphore_wait_to_signaller_ring(struct intel_ring_buffer
*ring, u32 ipehr)
* FIXME: gen8 semaphore support - currently we don't emit
* semaphores on bdw anyway, but this needs to be addressed when
* we merge that code.
+ *
+ * XXX: Gen8 needs more than just IPEHR.
*/
return NULL;
} else {
--
1.9.2
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