Commit 7d007f40 authored Jun 13, 2014 by Ville Syrjälä Committed by Daniel Vetter Jul 07, 2014

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

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>

parent a877e801

drivers/gpu/drm/i915/intel_display.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}