[PATCH v2 3/4] drm: rcar-du: fix DSI enable & disable sequence

[kernel test robot]

Hi Tomi,

I love your patch! Perhaps something to improve:

[auto build test WARNING on pinchartl-media/drm/du/next]
[also build test WARNING on linus/master v6.0-rc2 next-20220823]
[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/Tomi-Valkeinen/drm-rcar-du-DSI-fixes/20220822-210756
base:   git://linuxtv.org/pinchartl/media.git drm/du/next
config: arm-defconfig (https://download.01.org/0day-ci/archive/20220824/202208240201.ss8E6NY0-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/d037472981c443d699c022aa91c5335f686d82ad
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Tomi-Valkeinen/drm-rcar-du-DSI-fixes/20220822-210756
        git checkout d037472981c443d699c022aa91c5335f686d82ad
        # 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/

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 >>):

   In file included from drivers/gpu/drm/rcar-du/rcar_du_crtc.c:34:
>> drivers/gpu/drm/rcar-du/rcar_mipi_dsi.h:26:6: warning: no previous prototype for 'rcar_mipi_dsi_pclk_disable' [-Wmissing-prototypes]
      26 | void rcar_mipi_dsi_pclk_disable(struct drm_bridge *bridge)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/rcar_mipi_dsi_pclk_disable +26 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.h

    25	
  > 26	void rcar_mipi_dsi_pclk_disable(struct drm_bridge *bridge)
    27	{
    28	}
    29	#endif /* CONFIG_DRM_RCAR_MIPI_DSI */
    30	

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https://01.org/lkp