drm/i915: add L3 bank clock gating disable on VLV

Prevents a possible hang: WaDisableL3Bank2xClockGate.

v2: only apply to VLV, IVB doesn't need this anymore

References: https://bugs.freedesktop.org/show_bug.cgi?id=50245
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
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 5d7cf5f7e750..782e5d1dc218 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4043,6 +4043,9 @@
 # define GEN6_RCPBUNIT_CLOCK_GATE_DISABLE               (1 << 12)
 # define GEN6_RCCUNIT_CLOCK_GATE_DISABLE                (1 << 11)
 
+#define GEN7_UCGCTL4                            0x940c
+#define  GEN7_L3BANK2X_CLOCK_GATE_DISABLE       (1<<25)
+
 #define GEN6_RPNSWREQ                           0xA008
 #define   GEN6_TURBO_DISABLE                    (1<<31)
 #define   GEN6_FREQUENCY(x)                     ((x)<<25)