Apparently it doesn't work. X-tiled self-refresh works flawlessly
otoh. It's unclear whether this just borked wm setup from our side or
a hw restriction, but just disabling gets things going.
Note that this regression was only brought to light with
commit 3f2dc5ac05714711fc14f2bf0ee5e42d5c08c581
Author: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Fri Jan 10 14:06:47 2014 +0200
drm/i915: Fix 915GM self-refresh enable/disable
before that self-refresh for i915GM didn't work at all.
Kudos to Ville for spotting a little bug in the original patch I've
attached to the bug.
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76103
Tested-by: Krzysztof Mazur <krzysiek@xxxxxxxxxxxx>
Cc: Krzysztof Mazur <krzysiek@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c849986b40de..6e1a644b6330 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -1545,6 +1545,14 @@ static void i9xx_update_wm(struct drm_crtc *unused_crtc)
DRM_DEBUG_KMS("FIFO watermarks - A: %d, B: %d\n", planea_wm, planeb_wm);
+ if (IS_I915GM(dev) && enabled) {
+ struct intel_framebuffer *fb = to_intel_framebuffer(enabled->fb);
+
+ /* self-refresh seems busted with untiled */
+ if (fb->obj->tiling_mode == I915_TILING_NONE)
+ enabled = NULL;
+ }
+
/*
* Overlay gets an aggressive default since video jitter is bad.
*/
--
1.8.5.2
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