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drm/i915: Warn if there's a cdclk change in progess

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If someone is interested in the current cdclk frquency it should
be stable and not in process of changing frquency. Warn if the current
and requested cdclk don't match in .get_display_clock_spee() on vlv.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-06-13 13:37:53 +03:00 committed by Daniel Vetter
parent a877e8015c
commit 7d007f4059
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/intel_display.c
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@ -5275,6 +5275,10 @@ static int valleyview_get_display_clock_speed(struct drm_device *dev)
divider = val & DISPLAY_FREQUENCY_VALUES;
WARN((val & DISPLAY_FREQUENCY_STATUS) !=
(divider << DISPLAY_FREQUENCY_STATUS_SHIFT),
"cdclk change in progress\n");
return DIV_ROUND_CLOSEST(vco << 1, divider + 1);
}