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drm/i915: fix WRPLL clock calculation

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Forgot to convert to using the refclk variable when I added refclk
readout support, and Paulo noticed the resulting calculation was off due
to the way p & r are stored.

Reported-by: Paulo Zanoni <przanoni@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jesse Barnes 2014-01-22 12:58:04 -08:00 • committed by Daniel Vetter
parent f113d75019
commit 20f0ec16ca
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/intel_ddi.c
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@ -663,7 +663,8 @@ static int intel_ddi_calc_wrpll_link(struct drm_i915_private *dev_priv,
p = (wrpll & WRPLL_DIVIDER_POST_MASK) >> WRPLL_DIVIDER_POST_SHIFT;
n = (wrpll & WRPLL_DIVIDER_FB_MASK) >> WRPLL_DIVIDER_FB_SHIFT;
return (LC_FREQ * n) / (p * r);
/* Convert to KHz, p & r have a fixed point portion */
return (refclk * n * 100) / (p * r);
}
static void intel_ddi_clock_get(struct intel_encoder *encoder,