drm/i915: Use masked write for Context Status Buffer Pointer
This register needs to be updated with masked writes.
This was found by code inspection and comparison with Bspec and
doesn't seem to fix any known issue.
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
[danvet: Add note about impact.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 99bba8e..29347e7 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -521,7 +521,7 @@
ring->next_context_status_buffer = write_pointer % 6;
I915_WRITE(RING_CONTEXT_STATUS_PTR(ring),
- ((u32)ring->next_context_status_buffer & 0x07) << 8);
+ _MASKED_FIELD(0x07 << 8, ((u32)ring->next_context_status_buffer & 0x07) << 8));
}
static int execlists_context_queue(struct drm_i915_gem_request *request)