drm/i915: make the blitter report buffer modifications to the FBC unit

Without this change, blits to the front buffer won't invalidate FBC
state, causing us to scan out stale data.  Make sure we update these
bits on every FBC enable, since they may get clobbered if we shut off
the display.

References: https://bugzilla.kernel.org/show_bug.cgi?id=26932
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 6abb15f13c2..5cfc68940f1 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -513,6 +513,10 @@
 #define   GEN6_BLITTER_SYNC_STATUS                      (1 << 24)
 #define   GEN6_BLITTER_USER_INTERRUPT                   (1 << 22)
 
+#define GEN6_BLITTER_ECOSKPD    0x221d0
+#define   GEN6_BLITTER_LOCK_SHIFT                       16
+#define   GEN6_BLITTER_FBC_NOTIFY                       (1<<3)
+
 #define GEN6_BSD_SLEEP_PSMI_CONTROL     0x12050
 #define   GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK       (1 << 16)
 #define   GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_DISABLE           (1 << 0)