drm/i915: add render standby support
Render standy allows the GPU to power down the render unit when idle.
In order for this to work, it needs a page of graphics memory to save
state. This patch allocates that page and enables the feature on
supported chipsets.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1687edf..51fd152 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -260,6 +260,8 @@
#define HWS_PGA 0x02080
#define HWS_ADDRESS_MASK 0xfffff000
#define HWS_START_ADDRESS_SHIFT 4
+#define PWRCTXA 0x2088 /* 965GM+ only */
+#define PWRCTX_EN (1<<0)
#define IPEIR 0x02088
#define IPEHR 0x0208c
#define INSTDONE 0x02090
@@ -769,7 +771,8 @@
/** GM965 GM45 render standby register */
#define MCHBAR_RENDER_STANDBY 0x111B8
-
+#define RCX_SW_EXIT (1<<23)
+#define RSX_STATUS_MASK 0x00700000
#define PEG_BAND_GAP_DATA 0x14d68
/*