drm/i915: warn if Pineview CxSR can't be enabled
If we don't detect a supported memory configuration, we can't enable
CxSR. Warn the user in this case so they can file a bug.
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 22dcd08..6b9dd67 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4740,6 +4740,13 @@
(unsigned long)dev);
intel_setup_overlay(dev);
+
+ if (IS_IGD(dev) && !intel_get_cxsr_latency(IS_IGDG(dev),
+ dev_priv->fsb_freq,
+ dev_priv->mem_freq))
+ DRM_INFO("failed to find known CxSR latency "
+ "(found fsb freq %d, mem freq %d), disabling CxSR\n",
+ dev_priv->fsb_freq, dev_priv->mem_freq);
}
void intel_modeset_cleanup(struct drm_device *dev)