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Commit 2325991e authored by Chon Ming Lee's avatar Chon Ming Lee Committed by Daniel Vetter
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drm/i915/vlv: Workaround a punit issue in DDR data rate for 1333. 



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: default avatarChon Ming Lee <chon.ming.lee@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 8245be31

drivers/gpu/drm/i915/intel_pm.c

+1 −6
Original line number Diff line number Diff line
@@ -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);