From 7d007f40596670c8fddfae583952b091b02cf0eb Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 13 Jun 2014 13:37:53 +0300 Subject: [PATCH] drm/i915: Warn if there's a cdclk change in progess MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 251a095acceb..ac3ee2cee4b6 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -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); } -- 2.30.2