drm/i915: Add self-refresh support on Sandybridge
Add the support of memory self-refresh on Sandybridge, which is now
support 3 levels of watermarks and the source of the latency values
for watermarks has changed.
On Sandybridge, the LP0 WM value is not hardcoded any more. All the
latency value is now should be extracted from MCHBAR SSKPD register.
And the MCHBAR base address is changed, too.
For the WM values, if any calculated watermark values is larger than
the maximum value that can be programmed into the associated watermark
register, that watermark must be disabled.
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
[ickle: remove duplicate compute routines and fixup for checkpatch]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b284c13..61ef98d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -596,6 +596,8 @@
#define ILK_DISPLAY_CHICKEN1 0x42000
#define ILK_FBCQ_DIS (1<<22)
+#define ILK_PABSTRETCH_DIS (1<<21)
+
/*
* GPIO regs
@@ -955,6 +957,8 @@
*/
#define MCHBAR_MIRROR_BASE 0x10000
+#define MCHBAR_MIRROR_BASE_SNB 0x140000
+
/** 915-945 and GM965 MCH register controlling DRAM channel access */
#define DCC 0x10200
#define DCC_ADDRESSING_MODE_SINGLE_CHANNEL (0 << 0)
@@ -2346,6 +2350,40 @@
#define ILK_FIFO_LINE_SIZE 64
+/* define the WM info on Sandybridge */
+#define SNB_DISPLAY_FIFO 128
+#define SNB_DISPLAY_MAXWM 0x7f /* bit 16:22 */
+#define SNB_DISPLAY_DFTWM 8
+#define SNB_CURSOR_FIFO 32
+#define SNB_CURSOR_MAXWM 0x1f /* bit 4:0 */
+#define SNB_CURSOR_DFTWM 8
+
+#define SNB_DISPLAY_SR_FIFO 512
+#define SNB_DISPLAY_MAX_SRWM 0x1ff /* bit 16:8 */
+#define SNB_DISPLAY_DFT_SRWM 0x3f
+#define SNB_CURSOR_SR_FIFO 64
+#define SNB_CURSOR_MAX_SRWM 0x3f /* bit 5:0 */
+#define SNB_CURSOR_DFT_SRWM 8
+
+#define SNB_FBC_MAX_SRWM 0xf /* bit 23:20 */
+
+#define SNB_FIFO_LINE_SIZE 64
+
+
+/* the address where we get all kinds of latency value */
+#define SSKPD 0x5d10
+#define SSKPD_WM_MASK 0x3f
+#define SSKPD_WM0_SHIFT 0
+#define SSKPD_WM1_SHIFT 8
+#define SSKPD_WM2_SHIFT 16
+#define SSKPD_WM3_SHIFT 24
+
+#define SNB_LATENCY(shift) (I915_READ(MCHBAR_MIRROR_BASE_SNB + SSKPD) >> (shift) & SSKPD_WM_MASK)
+#define SNB_READ_WM0_LATENCY() SNB_LATENCY(SSKPD_WM0_SHIFT)
+#define SNB_READ_WM1_LATENCY() SNB_LATENCY(SSKPD_WM1_SHIFT)
+#define SNB_READ_WM2_LATENCY() SNB_LATENCY(SSKPD_WM2_SHIFT)
+#define SNB_READ_WM3_LATENCY() SNB_LATENCY(SSKPD_WM3_SHIFT)
+
/*
* The two pipe frame counter registers are not synchronized, so
* reading a stable value is somewhat tricky. The following code
@@ -2651,6 +2689,8 @@
#define ILK_VSDPFD_FULL (1<<21)
#define ILK_DSPCLK_GATE 0x42020
#define ILK_DPARB_CLK_GATE (1<<5)
+#define ILK_DPFD_CLK_GATE (1<<7)
+
/* According to spec this bit 7/8/9 of 0x42020 should be set to enable FBC */
#define ILK_CLK_FBC (1<<7)
#define ILK_DPFC_DIS1 (1<<8)
