drm/i915: Add thread stall DOP clock gating workaround on Broadwell.
Ben and I believe this will be necessary on production hardware.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
[danvet: Shuffle lines to group all ROW_CHICKEN writes and add a
cautious comment that this might not be needed on production hw.]
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index d575baf..aa83909 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5050,6 +5050,7 @@
#define GEN8_ROW_CHICKEN 0xe4f0
#define PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE (1<<8)
+#define STALL_DOP_GATING_DISABLE (1<<5)
#define GEN7_ROW_CHICKEN2 0xe4f4
#define GEN7_ROW_CHICKEN2_GT2 0xf4f4