[Intel-gfx] [PATCH 07/12] drm/i915/bxt: Update stepping check for WaDisableSDEUnitClockGating

[Arun Siluvery]

It is also applicable for B0.

Signed-off-by: Arun Siluvery <arun.siluvery at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 9151a2b..be39f7ad 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -121,8 +121,10 @@ static void bxt_init_clock_gating(struct drm_device *dev)
 	gen9_init_clock_gating(dev);
 
 	/* WaDisableSDEUnitClockGating:bxt */
-	I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
-		   GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+	if (INTEL_REVID(dev) >= BXT_REVID_A0) {
+		I915_WRITE(GEN8_UCGCTL6, (I915_READ(GEN8_UCGCTL6) |
+					  GEN8_SDEUNIT_CLOCK_GATE_DISABLE));
+	}
 
 	/* WaSetHDCunitClckGatingDisable:bxt */
 	/* WaSetHdcUnitClockGatingDisableInUcgctl6:bxt */
-- 
1.9.1