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drm/i915: Clamp efficient frequency to valid range 

The efficient frequency (RPe) should stay in the range
RPn <= RPe <= RP0.  The pcode clamps the returned value
internally on Broadwell but not on Haswell.

Fix for missing range check in
commit 93ee29203f
Author: Tom O'Rourke <Tom.O'Rourke@intel.com>
Date:   Wed Nov 19 14:21:52 2014 -0800

    drm/i915: Use efficient frequency for HSW/BDW

Reference: http://lists.freedesktop.org/archives/intel-gfx/2015-February/059802.html
Reported-by: Michael Auchter <a@phire.org>
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@vger.kernel.org # v3.19
Signed-off-by: Tom O'Rourke <Tom.O'Rourke@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Tom O'Rourke 2015-02-10 23:06:46 -08:00 committed by Jani Nikula
parent a8b3d52f8b
commit 46efa4abe5
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/i915/intel_pm.c
View File

@ -4005,7 +4005,10 @@ static void gen6_init_rps_frequencies(struct drm_device *dev)
&ddcc_status);
if (0 == ret)
dev_priv->rps.efficient_freq =
(ddcc_status >> 8) & 0xff;
clamp_t(u8,
((ddcc_status >> 8) & 0xff),
dev_priv->rps.min_freq,
dev_priv->rps.max_freq);
}
/* Preserve min/max settings in case of re-init */