drm/i915: Add the support of memory self-refresh on Ironlake
Update the self-refresh watermark for display plane/cursor and enable
the memory self-refresh on Ironlake. The watermark is also updated for
the active display plane.
More than 1W idle power is saved on one Ironlake laptop after enabling
memory self-refresh.
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 6d8bf622..527d30a 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2030,6 +2030,43 @@
#define PINEVIEW_CURSOR_DFT_WM 0
#define PINEVIEW_CURSOR_GUARD_WM 5
+
+/* define the Watermark register on Ironlake */
+#define WM0_PIPEA_ILK 0x45100
+#define WM0_PIPE_PLANE_MASK (0x7f<<16)
+#define WM0_PIPE_PLANE_SHIFT 16
+#define WM0_PIPE_SPRITE_MASK (0x3f<<8)
+#define WM0_PIPE_SPRITE_SHIFT 8
+#define WM0_PIPE_CURSOR_MASK (0x1f)
+
+#define WM0_PIPEB_ILK 0x45104
+#define WM1_LP_ILK 0x45108
+#define WM1_LP_SR_EN (1<<31)
+#define WM1_LP_LATENCY_SHIFT 24
+#define WM1_LP_LATENCY_MASK (0x7f<<24)
+#define WM1_LP_SR_MASK (0x1ff<<8)
+#define WM1_LP_SR_SHIFT 8
+#define WM1_LP_CURSOR_MASK (0x3f)
+
+/* Memory latency timer register */
+#define MLTR_ILK 0x11222
+/* the unit of memory self-refresh latency time is 0.5us */
+#define ILK_SRLT_MASK 0x3f
+
+/* define the fifo size on Ironlake */
+#define ILK_DISPLAY_FIFO 128
+#define ILK_DISPLAY_MAXWM 64
+#define ILK_DISPLAY_DFTWM 8
+
+#define ILK_DISPLAY_SR_FIFO 512
+#define ILK_DISPLAY_MAX_SRWM 0x1ff
+#define ILK_DISPLAY_DFT_SRWM 0x3f
+#define ILK_CURSOR_SR_FIFO 64
+#define ILK_CURSOR_MAX_SRWM 0x3f
+#define ILK_CURSOR_DFT_SRWM 8
+
+#define ILK_FIFO_LINE_SIZE 64
+
/*
* The two pipe frame counter registers are not synchronized, so
* reading a stable value is somewhat tricky. The following code
@@ -2310,8 +2347,15 @@
#define GTIIR 0x44018
#define GTIER 0x4401c
+#define ILK_DISPLAY_CHICKEN2 0x42004
+#define ILK_DPARB_GATE (1<<22)
+#define ILK_VSDPFD_FULL (1<<21)
+#define ILK_DSPCLK_GATE 0x42020
+#define ILK_DPARB_CLK_GATE (1<<5)
+
#define DISP_ARB_CTL 0x45000
#define DISP_TILE_SURFACE_SWIZZLING (1<<13)
+#define DISP_FBC_WM_DIS (1<<15)
/* PCH */