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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [IGT][BDW] spurious dmesg "Switching to FCLK failed" vairous kms_cursor_crc and/or kms_flip tests"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102243#c14">Comment # 14</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [IGT][BDW] spurious dmesg "Switching to FCLK failed" vairous kms_cursor_crc and/or kms_flip tests"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102243">bug 102243</a>
from <span class="vcard"><a class="email" href="mailto:marta.lofstedt@intel.com" title="Marta Löfstedt <marta.lofstedt@intel.com>"> <span class="fn">Marta Löfstedt</span></a>
</span></b>
<pre>Tested this which doesn't work either.
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -669,10 +669,13 @@ static void bdw_set_cdclk(struct drm_i915_private
*dev_priv,
val |= LCPLL_CD_SOURCE_FCLK;
I915_WRITE(LCPLL_CTL, val);
+ preempt_disable();
if (wait_for_us(I915_READ(LCPLL_CTL) &
LCPLL_CD_SOURCE_FCLK_DONE, 1))
DRM_ERROR("Switching to FCLK failed\n");
+ preempt_enable();</pre>
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