[PATCH 4/7] drm/i915: Fix fifo size for self-refresh watermark on 965G

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

From: Zhao Yakui <yakui.zhao@intel.com>

The total self-refresh fifo entry size for display plane is 512
instead of 128 for 965G. Also fix WM value mask for 965G.

About 1.0W power can be saved on one T61 laptop after the self-refresh
watermark is configured correctly.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Zhenyu wang <zhenyuw@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h      |    3 ++-
 drivers/gpu/drm/i915/intel_display.c |    4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 64b0a3a..cf41c96 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2099,7 +2099,8 @@
 #define I830_FIFO_LINE_SIZE	32
 
 #define G4X_FIFO_SIZE		127
-#define I945_FIFO_SIZE		127 /* 945 & 965 */
+#define I965_FIFO_SIZE		512
+#define I945_FIFO_SIZE		127
 #define I915_FIFO_SIZE		95
 #define I855GM_FIFO_SIZE	127 /* In cachelines */
 #define I830_FIFO_SIZE		95
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2c3377e..43e3710 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2969,10 +2969,10 @@ static void i965_update_wm(struct drm_device *dev, int planea_clock,
 			      pixel_size * sr_hdisplay;
 		sr_entries = roundup(sr_entries / I915_FIFO_LINE_SIZE, 1);
 		DRM_DEBUG("self-refresh entries: %d\n", sr_entries);
-		srwm = I945_FIFO_SIZE - sr_entries;
+		srwm = I965_FIFO_SIZE - sr_entries;
 		if (srwm < 0)
 			srwm = 1;
-		srwm &= 0x3f;
+		srwm &= 0x1ff;
 		I915_WRITE(FW_BLC_SELF, FW_BLC_SELF_EN);
 	} else {
 		/* Turn off self refresh if both pipes are enabled */
-- 
1.7.0.4