[jsarha:topic/cros-sof-v4.19 1947/6555] drivers/gpu/drm/rcar-du/rcar_du_crtc.c:684:22: sparse: sparse: symbol 'rcar_du_crtc_mode_valid' was not declared. Should it be static?

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/jsarha/linux topic/cros-sof-v4.19
head:   d7a3e91d8d16d1ef8653deec5a1fffc4de034a0c
commit: c244a5049a14aef78319f7cea73b6992f917631b [1947/6555] UPSTREAM: drm: rcar-du: Add interlaced feature flag
config: arm64-randconfig-r111-20240422 (https://download.01.org/0day-ci/archive/20240424/202404241146.ADG16jAt-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20240424/202404241146.ADG16jAt-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404241146.ADG16jAt-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/gpu/drm/rcar-du/rcar_du_crtc.c:684:22: sparse: sparse: symbol 'rcar_du_crtc_mode_valid' was not declared. Should it be static?
   drivers/gpu/drm/rcar-du/rcar_du_crtc.c:891:12: sparse: sparse: symbol 'rcar_du_crtc_get_crc_sources' was not declared. Should it be static?
   drivers/gpu/drm/rcar-du/rcar_du_crtc.c:684:22: warning: no previous prototype for 'rcar_du_crtc_mode_valid' [-Wmissing-prototypes]
     684 | enum drm_mode_status rcar_du_crtc_mode_valid(struct drm_crtc *crtc,
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/rcar-du/rcar_du_crtc.c:891:20: warning: no previous prototype for 'rcar_du_crtc_get_crc_sources' [-Wmissing-prototypes]
     891 | const char *const *rcar_du_crtc_get_crc_sources(struct drm_crtc *crtc,
         |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/rcar_du_crtc_mode_valid +684 drivers/gpu/drm/rcar-du/rcar_du_crtc.c

   683	
 > 684	enum drm_mode_status rcar_du_crtc_mode_valid(struct drm_crtc *crtc,
   685					   const struct drm_display_mode *mode)
   686	{
   687		struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
   688		struct rcar_du_device *rcdu = rcrtc->group->dev;
   689		bool interlaced = mode->flags & DRM_MODE_FLAG_INTERLACE;
   690	
   691		if (interlaced && !rcar_du_has(rcdu, RCAR_DU_FEATURE_INTERLACED))
   692			return MODE_NO_INTERLACE;
   693	
   694		return MODE_OK;
   695	}
   696	

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