drm/i915/vlv: fixup DDR freq detection per Punit spec
Either the docs were wrong or the values have changed since the old days
before we had wheels.
Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 13afd54..a5778e5 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5319,15 +5319,22 @@
mutex_unlock(&dev_priv->rps.hw_lock);
switch ((val >> 6) & 3) {
case 0:
- case 1:
dev_priv->mem_freq = 800;
break;
- case 2:
+ case 1:
dev_priv->mem_freq = 1066;
break;
- case 3:
+ case 2:
dev_priv->mem_freq = 1333;
break;
+ case 3:
+ /*
+ * Probably a BIOS/Punit bug, or a new platform we don't
+ * support yet.
+ */
+ WARN(1, "invalid DDR freq detected, assuming 800MHz\n");
+ dev_priv->mem_freq = 800;
+ break;
}
DRM_DEBUG_DRIVER("DDR speed: %d MHz", dev_priv->mem_freq);