drm/i915/skl: Avoid using un-initialized bits_per_pixel
Don't rely on fb->bits_per_pixel as intel_framebuffer_init is not filling bits_per_pixel field of fb-struct for YUV pixel format. This leads to divide by zero error during watermark calculation. Signed-off-by: Kumar, Mahesh <mahesh1.kumar@intel.com> Cc: Konduru, Chandra <chandra.konduru@intel.com> Reviewed-by: Sonika Jindal <sonika.jindal@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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