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_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index 992d561..cd10d9b 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -699,8 +699,10 @@
pci_read_config_byte(dev->pdev, LBB, &dev_priv->saveLBB);
/* Render Standby */
- if (IS_I965G(dev) && IS_MOBILE(dev))
+ if (I915_HAS_RC6(dev)) {
dev_priv->saveRENDERSTANDBY = I915_READ(MCHBAR_RENDER_STANDBY);
+ dev_priv->savePWRCTXA = I915_READ(PWRCTXA);
+ }
/* Hardware status page */
dev_priv->saveHWS = I915_READ(HWS_PGA);
@@ -762,8 +764,10 @@
pci_write_config_byte(dev->pdev, LBB, dev_priv->saveLBB);
/* Render Standby */
- if (IS_I965G(dev) && IS_MOBILE(dev))
+ if (I915_HAS_RC6(dev)) {
I915_WRITE(MCHBAR_RENDER_STANDBY, dev_priv->saveRENDERSTANDBY);
+ I915_WRITE(PWRCTXA, dev_priv->savePWRCTXA);
+ }
/* Hardware status page */
I915_WRITE(HWS_PGA, dev_priv->saveHWS);