[PATCH 5/6] drm/edid: add helpers to get/set struct cea_sad from/to 3-byte sad

[kernel test robot]

Hi Jani,

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/Jani-Nikula/drm-edid-split-out-drm_eld-h-from-drm_edid-h/20230907-173011
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
patch link:    https://lore.kernel.org/r/eba53a0904126fb904a5190750002695350f44eb.1694078430.git.jani.nikula%40intel.com
patch subject: [PATCH 5/6] drm/edid: add helpers to get/set struct cea_sad from/to 3-byte sad
config: arm-defconfig (https://download.01.org/0day-ci/archive/20230907/202309071934.AzntzCVc-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230907/202309071934.AzntzCVc-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/202309071934.AzntzCVc-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/drm_edid.c:5505:6: warning: no previous prototype for 'drm_edid_cta_sad_get' [-Wmissing-prototypes]
    5505 | void drm_edid_cta_sad_get(const struct cea_sad *cta_sad, u8 *sad)
         |      ^~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/drm_edid.c:5515:6: warning: no previous prototype for 'drm_edid_cta_sad_set' [-Wmissing-prototypes]
    5515 | void drm_edid_cta_sad_set(struct cea_sad *cta_sad, const u8 *sad)
         |      ^~~~~~~~~~~~~~~~~~~~


vim +/drm_edid_cta_sad_get +5505 drivers/gpu/drm/drm_edid.c

  5501	
  5502	/*
  5503	 * Get 3-byte SAD buf from struct cea_sad.
  5504	 */
> 5505	void drm_edid_cta_sad_get(const struct cea_sad *cta_sad, u8 *sad)
  5506	{
  5507		sad[0] = cta_sad->format << 3 | cta_sad->channels;
  5508		sad[1] = cta_sad->freq;
  5509		sad[2] = cta_sad->byte2;
  5510	}
  5511	
  5512	/*
  5513	 * Set struct cea_sad from 3-byte SAD buf.
  5514	 */
> 5515	void drm_edid_cta_sad_set(struct cea_sad *cta_sad, const u8 *sad)
  5516	{
  5517		cta_sad->format = (sad[0] & 0x78) >> 3;
  5518		cta_sad->channels = sad[0] & 0x07;
  5519		cta_sad->freq = sad[1] & 0x7f;
  5520		cta_sad->byte2 = sad[2];
  5521	}
  5522	

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