[PATCH 02/10] drm: rcar-du: Add encoder lib support

[kernel test robot]

Hi Biju,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-tip/drm-tip]
[also build test WARNING on next-20220726]
[cannot apply to drm-intel/for-linux-next pinchartl-media/drm/du/next linus/master v5.19-rc8]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Biju-Das/Add-RCar-DU-lib-support/20220727-004502
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
config: arm-randconfig-r035-20220724 (https://download.01.org/0day-ci/archive/20220727/202207270934.Cq65wqcE-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/a703859b5858b11c89202731a2eba345dcbe1057
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Biju-Das/Add-RCar-DU-lib-support/20220727-004502
        git checkout a703859b5858b11c89202731a2eba345dcbe1057
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/gpu/drm/rcar-du/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/rcar-du/rcar_du_encoder.c:20:5: warning: no previous prototype for 'rcar_du_encoder_init' [-Wmissing-prototypes]
      20 | int rcar_du_encoder_init(struct rcar_du_device *rcdu,
         |     ^~~~~~~~~~~~~~~~~~~~


vim +/rcar_du_encoder_init +20 drivers/gpu/drm/rcar-du/rcar_du_encoder.c

4bf8e1962f91eed drivers/gpu/drm/rcar-du/rcar_du_lvds.c    Laurent Pinchart 2013-06-19  15  
6978f123776594b drivers/gpu/drm/rcar-du/rcar_du_encoder.c Laurent Pinchart 2013-06-15  16  /* -----------------------------------------------------------------------------
6978f123776594b drivers/gpu/drm/rcar-du/rcar_du_encoder.c Laurent Pinchart 2013-06-15  17   * Encoder
6978f123776594b drivers/gpu/drm/rcar-du/rcar_du_encoder.c Laurent Pinchart 2013-06-15  18   */
6978f123776594b drivers/gpu/drm/rcar-du/rcar_du_encoder.c Laurent Pinchart 2013-06-15  19  
6978f123776594b drivers/gpu/drm/rcar-du/rcar_du_encoder.c Laurent Pinchart 2013-06-15 @20  int rcar_du_encoder_init(struct rcar_du_device *rcdu,

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