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drm/i915/vlv: Workaround a punit issue in DDR data rate for 1333.

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For DDR data rate reporting by Punit in PUNIT_GPU_FREQ_STS, the actual
data encoding is 00b=800, 01b=1066, 10b=1333, 11b=1333.

Some premium VLV sku will get the DDR_DATA_RATE set as 11.  As a result,
the turbo frequency reporting will be incorrect without this workaround.

Signed-off-by: Chon Ming Lee <chon.ming.lee@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chon Ming Lee 2013-11-07 15:23:26 +08:00 committed by Daniel Vetter
parent 8245be3139
commit 2325991e02
1 changed files with 1 additions and 6 deletions
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7
drivers/gpu/drm/i915/intel_pm.c
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@ -5322,12 +5322,7 @@ static void valleyview_init_clock_gating(struct drm_device *dev)
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;
dev_priv->mem_freq = 1333;
break;
}
DRM_DEBUG_DRIVER("DDR speed: %d MHz", dev_priv->mem_freq);