[Intel-gfx] [PATCH 08/29] drm/dp: Add helpers to calculate the link BW overhead

[kernel test robot]

Hi Imre,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-tip/drm-tip]

url:    https://github.com/intel-lab-lkp/linux/commits/Imre-Deak/drm-dp_mst-Fix-fractional-DSC-bpp-handling/20231024-091920
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
patch link:    https://lore.kernel.org/r/20231024010925.3949910-9-imre.deak%40intel.com
patch subject: [Intel-gfx] [PATCH 08/29] drm/dp: Add helpers to calculate the link BW overhead
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20231024/202310241055.Pz9vy06V-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231024/202310241055.Pz9vy06V-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310241055.Pz9vy06V-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/display/drm_dp_helper.c:4002: warning: Function parameter or member 'is_uhbr' not described in 'drm_dp_bw_channel_coding_efficiency'
>> drivers/gpu/drm/display/drm_dp_helper.c:4002: warning: expecting prototype for Returns the efficiency in the 100%/coding(). Prototype was for drm_dp_bw_channel_coding_efficiency() instead


vim +4002 drivers/gpu/drm/display/drm_dp_helper.c

  3996	
  3997	/**
  3998	 * Returns the efficiency in the 100%/coding-overhead% ratio in
  3999	 * 1ppm units.
  4000	 */
  4001	int drm_dp_bw_channel_coding_efficiency(bool is_uhbr)
> 4002	{
  4003		if (is_uhbr)
  4004			return 967100;
  4005		else
  4006			/*
  4007			 * Note that on 8b/10b MST the efficiency is only
  4008			 * 78.75% due to the 1 out of 64 MTPH packet overhead,
  4009			 * not accounted for here.
  4010			 */
  4011			return 800000;
  4012	}
  4013	EXPORT_SYMBOL(drm_dp_bw_channel_coding_efficiency);
  4014	

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