[Intel-gfx] [PATCH 4/6] drm/i915/bxt: Update WaSetHDCunitClckGatingDisable

[Arun Siluvery]

As per spec this is applicable to 3x6 SKUs only, add condition to
check the same.

Cc: Nick Hoath <nicholas.hoath at intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 0f6588c..bfce904 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -119,12 +119,12 @@ static void bxt_init_clock_gating(struct drm_device *dev)
 
 	gen9_init_clock_gating(dev);
 
-	/*
-	 * FIXME:
-	 * GEN8_HDCUNIT_CLOCK_GATE_DISABLE_HDCREQ applies on 3x6 GT SKUs only.
-	 */
-	I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) |
-		   GEN8_HDCUNIT_CLOCK_GATE_DISABLE_HDCREQ);
+	/* WaSetHDCunitClckGatingDisable:bxt */
+	/* as per spec this is applicable to 3x6 GT SKUs only */
+	if (INTEL_INFO(dev)->subslice_total == 3) {
+		I915_WRITE(GEN8_UCGCTL6, (I915_READ(GEN8_UCGCTL6) |
+					  GEN8_HDCUNIT_CLOCK_GATE_DISABLE_HDCREQ));
+	}
 
 	if (INTEL_REVID(dev) == BXT_REVID_A0) {
 		/*
-- 
1.9.1