drm/i915: Add a partial instruction shootdown workaround on Broadwell.

I believe this will be necessary on production hardware.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
[danvet: Fix whitespace fail spotted by checkpatch. Also add missing
:bdw w/a tag that Ville spotted.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index e3130352dfaa..d575baf52d54 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5048,6 +5048,9 @@
 #define   GEN7_SINGLE_SUBSCAN_DISPATCH_ENABLE   (1<<10)
 #define   GEN7_PSD_SINGLE_PORT_DISPATCH_ENABLE  (1<<3)
 
+#define GEN8_ROW_CHICKEN                0xe4f0
+#define   PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE (1<<8)
+
 #define GEN7_ROW_CHICKEN2               0xe4f4
 #define GEN7_ROW_CHICKEN2_GT2           0xf4f4
 #define   DOP_CLOCK_GATING_DISABLE      (1<<0)