apfs/linux-apfs
0
0
Fork 0
mirror of https://github.com/linux-apfs/linux-apfs.git synced 2026-05-01 15:00:59 -07:00
Code Issues Packages Projects Releases Wiki Activity

drm/i915: re-enable rc6 support for Ironlake+

Browse Source 
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>
This commit is contained in:
Jesse Barnes
2011-01-05 12:01:24 -08:00
committed by Chris Wilson
parent 0dc79fb2a3
commit 88271da3f3
4 changed files with 91 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/gpu/drm/i915/intel_display.c
+17 -15
View File
@@ -6420,35 +6420,37 @@ void intel_enable_clock_gating(struct drm_device *dev)
* GPU can automatically power down the render unit if given a page
* to save state.
*/
if (IS_IRONLAKE_M(dev) && 0) { /* XXX causes a failure during suspend */
if (IS_IRONLAKE_M(dev)) {
if (dev_priv->renderctx == NULL)
dev_priv->renderctx = intel_alloc_context_page(dev);
if (dev_priv->renderctx) {
struct drm_i915_gem_object *obj = dev_priv->renderctx;
if (BEGIN_LP_RING(4) == 0) {
OUT_RING(MI_SET_CONTEXT);
OUT_RING(obj->gtt_offset |
MI_MM_SPACE_GTT |
MI_SAVE_EXT_STATE_EN |
MI_RESTORE_EXT_STATE_EN |
MI_RESTORE_INHIBIT);
OUT_RING(MI_NOOP);
OUT_RING(MI_FLUSH);
ADVANCE_LP_RING();
if (BEGIN_LP_RING(6) != 0) {
i915_gem_object_unpin(obj);
drm_gem_object_unreference(&obj->base);
dev_priv->renderctx = NULL;
return;
}
OUT_RING(MI_SUSPEND_FLUSH | MI_SUSPEND_FLUSH_EN);
OUT_RING(MI_SET_CONTEXT);
OUT_RING(obj->gtt_offset |
MI_MM_SPACE_GTT |
MI_SAVE_EXT_STATE_EN |
MI_RESTORE_EXT_STATE_EN |
MI_RESTORE_INHIBIT);
OUT_RING(MI_SUSPEND_FLUSH);
OUT_RING(MI_NOOP);
OUT_RING(MI_FLUSH);
ADVANCE_LP_RING();
} else
DRM_DEBUG_KMS("Failed to allocate render context."
"Disable RC6\n");
}
if (IS_GEN4(dev) && IS_MOBILE(dev)) {
if (dev_priv->pwrctx == NULL)
dev_priv->pwrctx = intel_alloc_context_page(dev);
if (dev_priv->pwrctx) {
struct drm_i915_gem_object *obj = dev_priv->pwrctx;
I915_WRITE(PWRCTXA, obj->gtt_offset | PWRCTX_EN);
I915_WRITE(MCHBAR_RENDER_STANDBY,
I915_READ(MCHBAR_RENDER_STANDBY) & ~RCX_SW_EXIT);
}
}
}