diff options
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index 7023e88531b5..d7082124eee3 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -483,10 +483,10 @@ static inline u32 intel_ring_get_tail(struct intel_ringbuffer *ringbuf) /* * Arbitrary size for largest possible 'add request' sequence. The code paths * are complex and variable. Empirical measurement shows that the worst case - * is ILK at 136 words. Reserving too much is better than reserving too little - * as that allows for corner cases that might have been missed. So the figure - * has been rounded up to 160 words. + * is BDW at 192 bytes (6 + 6 + 36 dwords), then ILK at 136 bytes. However, + * we need to allocate double the largest single packet within that emission + * to account for tail wraparound (so 6 + 6 + 72 dwords for BDW). */ -#define MIN_SPACE_FOR_ADD_REQUEST 160 +#define MIN_SPACE_FOR_ADD_REQUEST 336 #endif /* _INTEL_RINGBUFFER_H_ */ |