[PATCH] drm/i915: Fix drain latency precision multipler for VLV

[Zhenyu Wang <zhenyuw@linux.intel.com>]

>From spec the drain latency precision multipler is either 32 or 64 for VLV.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h | 18 +++++++++---------
 drivers/gpu/drm/i915/intel_pm.c | 12 ++++++------
 2 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2f564ce..cb6509c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3381,19 +3381,19 @@
 
 /* drain latency register values*/
 #define DRAIN_LATENCY_PRECISION_32	32
-#define DRAIN_LATENCY_PRECISION_16	16
+#define DRAIN_LATENCY_PRECISION_64	64
 #define VLV_DDL1			(VLV_DISPLAY_BASE + 0x70050)
-#define DDL_CURSORA_PRECISION_32	(1<<31)
-#define DDL_CURSORA_PRECISION_16	(0<<31)
+#define DDL_CURSORA_PRECISION_64	(1<<31)
+#define DDL_CURSORA_PRECISION_32	(0<<31)
 #define DDL_CURSORA_SHIFT		24
-#define DDL_PLANEA_PRECISION_32		(1<<7)
-#define DDL_PLANEA_PRECISION_16		(0<<7)
+#define DDL_PLANEA_PRECISION_64		(1<<7)
+#define DDL_PLANEA_PRECISION_32		(0<<7)
 #define VLV_DDL2			(VLV_DISPLAY_BASE + 0x70054)
-#define DDL_CURSORB_PRECISION_32	(1<<31)
-#define DDL_CURSORB_PRECISION_16	(0<<31)
+#define DDL_CURSORB_PRECISION_64	(1<<31)
+#define DDL_CURSORB_PRECISION_32	(0<<31)
 #define DDL_CURSORB_SHIFT		24
-#define DDL_PLANEB_PRECISION_32		(1<<7)
-#define DDL_PLANEB_PRECISION_16		(0<<7)
+#define DDL_PLANEB_PRECISION_64		(1<<7)
+#define DDL_PLANEB_PRECISION_32		(0<<7)
 
 /* FIFO watermark sizes etc */
 #define G4X_FIFO_LINE_SIZE	64
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a6b877a..b17b396 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -1248,13 +1248,13 @@ static bool vlv_compute_drain_latency(struct drm_device *dev,
 
 	entries = (clock / 1000) * pixel_size;
 	*plane_prec_mult = (entries > 256) ?
-		DRAIN_LATENCY_PRECISION_32 : DRAIN_LATENCY_PRECISION_16;
+		DRAIN_LATENCY_PRECISION_64 : DRAIN_LATENCY_PRECISION_32;
 	*plane_dl = (64 * (*plane_prec_mult) * 4) / ((clock / 1000) *
 						     pixel_size);
 
 	entries = (clock / 1000) * 4;	/* BPP is always 4 for cursor */
 	*cursor_prec_mult = (entries > 256) ?
-		DRAIN_LATENCY_PRECISION_32 : DRAIN_LATENCY_PRECISION_16;
+		DRAIN_LATENCY_PRECISION_64 : DRAIN_LATENCY_PRECISION_32;
 	*cursor_dl = (64 * (*cursor_prec_mult) * 4) / ((clock / 1000) * 4);
 
 	return true;
@@ -1280,9 +1280,9 @@ static void vlv_update_drain_latency(struct drm_device *dev)
 	if (vlv_compute_drain_latency(dev, 0, &plane_prec_mult, &planea_dl,
 				      &cursor_prec_mult, &cursora_dl)) {
 		cursora_prec = (cursor_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
-			DDL_CURSORA_PRECISION_32 : DDL_CURSORA_PRECISION_16;
+			DDL_CURSORA_PRECISION_32 : DDL_CURSORA_PRECISION_64;
 		planea_prec = (plane_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
-			DDL_PLANEA_PRECISION_32 : DDL_PLANEA_PRECISION_16;
+			DDL_PLANEA_PRECISION_32 : DDL_PLANEA_PRECISION_64;
 
 		I915_WRITE(VLV_DDL1, cursora_prec |
 				(cursora_dl << DDL_CURSORA_SHIFT) |
@@ -1293,9 +1293,9 @@ static void vlv_update_drain_latency(struct drm_device *dev)
 	if (vlv_compute_drain_latency(dev, 1, &plane_prec_mult, &planeb_dl,
 				      &cursor_prec_mult, &cursorb_dl)) {
 		cursorb_prec = (cursor_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
-			DDL_CURSORB_PRECISION_32 : DDL_CURSORB_PRECISION_16;
+			DDL_CURSORB_PRECISION_32 : DDL_CURSORB_PRECISION_64;
 		planeb_prec = (plane_prec_mult == DRAIN_LATENCY_PRECISION_32) ?
-			DDL_PLANEB_PRECISION_32 : DDL_PLANEB_PRECISION_16;
+			DDL_PLANEB_PRECISION_32 : DDL_PLANEB_PRECISION_64;
 
 		I915_WRITE(VLV_DDL2, cursorb_prec |
 				(cursorb_dl << DDL_CURSORB_SHIFT) |
-- 
1.9.0