drm/i915: re-enable rc6 support for Ironlake+
Re-enable rc6 support on Ironlake for power savings. Adds a debugfs
file to check current RC state, adds a missing workaround for Ironlake
MI_SET_CONTEXT instructions, and renames MCHBAR_RENDER_STANDBY to
RSTDBYCTL to match the docs.
Keep RC6 and the power context disabled on pre-ILK. It only seems to
hang and doesn't save any power.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 7243d64..9c4cdc1 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -896,7 +896,7 @@
struct drm_device *dev = node->minor->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
u32 rgvmodectl = I915_READ(MEMMODECTL);
- u32 rstdbyctl = I915_READ(MCHBAR_RENDER_STANDBY);
+ u32 rstdbyctl = I915_READ(RSTDBYCTL);
u16 crstandvid = I915_READ16(CRSTANDVID);
seq_printf(m, "HD boost: %s\n", (rgvmodectl & MEMMODE_BOOST_EN) ?
@@ -919,6 +919,30 @@
seq_printf(m, "RS2 VID: %d\n", ((crstandvid >> 8) & 0x3f));
seq_printf(m, "Render standby enabled: %s\n",
(rstdbyctl & RCX_SW_EXIT) ? "no" : "yes");
+ seq_printf(m, "Current RS state: ");
+ switch (rstdbyctl & RSX_STATUS_MASK) {
+ case RSX_STATUS_ON:
+ seq_printf(m, "on\n");
+ break;
+ case RSX_STATUS_RC1:
+ seq_printf(m, "RC1\n");
+ break;
+ case RSX_STATUS_RC1E:
+ seq_printf(m, "RC1E\n");
+ break;
+ case RSX_STATUS_RS1:
+ seq_printf(m, "RS1\n");
+ break;
+ case RSX_STATUS_RS2:
+ seq_printf(m, "RS2 (RC6)\n");
+ break;
+ case RSX_STATUS_RS3:
+ seq_printf(m, "RC3 (RC6+)\n");
+ break;
+ default:
+ seq_printf(m, "unknown\n");
+ break;
+ }
return 0;
}