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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>
This commit is contained in:
Jesse Barnes 2013-11-04 16:07:00 -08:00 committed by Daniel Vetter
parent 586f49dc78
commit f64a28a7c5
1 changed files with 10 additions and 3 deletions
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13
drivers/gpu/drm/i915/intel_pm.c
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@ -5319,15 +5319,22 @@ static void valleyview_init_clock_gating(struct drm_device *dev)
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);