Commits
Imre Deak committed d66a21947e2
drm/i915/bxt: Sanitize CDCLK to fix breakage during S4 resume I noticed that during S4 resume BIOS incorrectly sets bits 18, 19 which are reserved/MBZ and sets the decimal frequency fields to all 0xff in the CDCLK register. The result is a hard lockup as display register accesses are attempted later. Work around this by sanitizing the CDCLK PLL/dividers the same way it's done on SKL. While this is clearly a BIOS bug which should be fixed separately, it doesn't hurt to check/sanitize this regardless. v2: - Use the same condition for VCO and CDCLK in broxton_init_cdclk as is used in skl_init_cdclk for the same purpose. CC: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1464093513-16258-2-git-send-email-imre.deak@intel.com