drm/i915: Compute proper intermediate wms for vlv/cvh

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Since the watermark registers arent double buffered on VLV/CHV, we'll
need to play around with intermediate watermarks same was as we do on
ILK-BDW.

The watermark registers on VLV/CHV contain inverted values, so to find
the intermediate watermark value we just take the minimum of the
active and optimal values. This also means that, unlike ILK-BDW,
there's no chance that we'd fail to find a working intermediate
watermarks. As long as both the active and optimal watermarks are valid
the intermediate watermarks will come out valid as well.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170302171508.1666-10-ville.syrjala@linux.intel.com

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This commit is contained in:

Ville Syrjälä 2017-03-02 19:14:59 +02:00

parent 236c48e692

commit 4841da51a7

2 changed files with 60 additions and 1 deletions

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drivers/gpu/drm/i915/intel_drv.h

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59

drivers/gpu/drm/i915/intel_pm.c

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