[rcar:vsp1/v3u 17/69] drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:613:5: warning: no previous prototype for function 'rcar_mipi_dsi_clk_enable'

[rcar:vsp1/v3u 17/69] drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:613:5: warning: no previous prototype for function 'rcar_mipi_dsi_clk_enable'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kbingham/rcar.git vsp1/v3u
head:   15890c07a0b56cea8221557f4c28a2052c1b3d14
commit: 7708982fa60fe0d474f68d42d0354e1973df954d [17/69] drm: rcar-du: Add R-Car DSI driver
config: arm64-randconfig-r034-20210519 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project ceb1ac9812cb0972cfa34cecc5e5704ae2a22063)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/kbingham/rcar.git/commit/?id=7708982fa60fe0d474f68d42d0354e1973df954d
        git remote add rcar https://git.kernel.org/pub/scm/linux/kernel/git/kbingham/rcar.git
        git fetch --no-tags rcar vsp1/v3u
        git checkout 7708982fa60fe0d474f68d42d0354e1973df954d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:613:5: warning: no previous prototype for function 'rcar_mipi_dsi_clk_enable' [-Wmissing-prototypes]
   int rcar_mipi_dsi_clk_enable(struct drm_bridge *bridge)
       ^
   drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:613:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int rcar_mipi_dsi_clk_enable(struct drm_bridge *bridge)
   ^
   static 
>> drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:636:6: warning: no previous prototype for function 'rcar_mipi_dsi_clk_disable' [-Wmissing-prototypes]
   void rcar_mipi_dsi_clk_disable(struct drm_bridge *bridge)
        ^
   drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:636:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void rcar_mipi_dsi_clk_disable(struct drm_bridge *bridge)
   ^
   static 
   2 warnings generated.


vim +/rcar_mipi_dsi_clk_enable +613 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c

   608	
   609	/* -----------------------------------------------------------------------------
   610	 * Clock Setting
   611	 */
   612	
 > 613	int rcar_mipi_dsi_clk_enable(struct drm_bridge *bridge)
   614	{
   615		struct rcar_mipi_dsi *mipi_dsi = bridge_to_rcar_mipi_dsi(bridge);
   616		int ret;
   617	
   618		reset_control_deassert(mipi_dsi->rstc);
   619	
   620		ret = clk_prepare_enable(mipi_dsi->clocks.mod);
   621		if (ret < 0)
   622			return ret;
   623	
   624		ret = clk_prepare_enable(mipi_dsi->clocks.dsi);
   625		if (ret < 0)
   626			return ret;
   627	
   628		ret = rcar_mipi_dsi_startup(mipi_dsi);
   629		if (ret < 0)
   630			return ret;
   631	
   632		return 0;
   633	}
   634	EXPORT_SYMBOL_GPL(rcar_mipi_dsi_clk_enable);
   635	
 > 636	void rcar_mipi_dsi_clk_disable(struct drm_bridge *bridge)
   637	{
   638		struct rcar_mipi_dsi *mipi_dsi = bridge_to_rcar_mipi_dsi(bridge);
   639	
   640		rcar_mipi_dsi_shutdown(mipi_dsi);
   641	
   642		/* Disable DSI clock and reset HW */
   643		clk_disable_unprepare(mipi_dsi->clocks.dsi);
   644	
   645		clk_disable_unprepare(mipi_dsi->clocks.mod);
   646	
   647		reset_control_assert(mipi_dsi->rstc);
   648	}
   649	EXPORT_SYMBOL_GPL(rcar_mipi_dsi_clk_disable);
   650	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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