[PATCH v3 5/8] drm: atmel_hlcdc: Add support for XLCDC in atmel LCD driver

[kernel test robot]

Hi Manikandan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on lee-mfd/for-mfd-next lee-leds/for-leds-next lee-mfd/for-mfd-fixes linus/master v6.5-rc6 next-20230817]
[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/Manikandan-Muralidharan/mfd-atmel-hlcdc-Add-compatible-for-sam9x75-XLCD-controller/20230817-172003
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20230817091250.225512-6-manikandan.m%40microchip.com
patch subject: [PATCH v3 5/8] drm: atmel_hlcdc: Add support for XLCDC in atmel LCD driver
config: arm-randconfig-r046-20230817 (https://download.01.org/0day-ci/archive/20230817/202308172303.AgUIhGKY-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230817/202308172303.AgUIhGKY-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/202308172303.AgUIhGKY-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c:1013:6: warning: no previous prototype for function 'hlcdc_irq_dbg' [-Wmissing-prototypes]
    1013 | void hlcdc_irq_dbg(struct atmel_hlcdc_plane *plane,
         |      ^
   drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c:1013:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    1013 | void hlcdc_irq_dbg(struct atmel_hlcdc_plane *plane,
         | ^
         | static 
>> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c:1029:6: warning: no previous prototype for function 'xlcdc_irq_dbg' [-Wmissing-prototypes]
    1029 | void xlcdc_irq_dbg(struct atmel_hlcdc_plane *plane,
         |      ^
   drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c:1029:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    1029 | void xlcdc_irq_dbg(struct atmel_hlcdc_plane *plane,
         | ^
         | static 
   2 warnings generated.


vim +/hlcdc_irq_dbg +1013 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c

  1012	
> 1013	void hlcdc_irq_dbg(struct atmel_hlcdc_plane *plane,
  1014			   const struct atmel_hlcdc_layer_desc *desc)
  1015	{
  1016		u32 isr = atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_HLCDC_LAYER_ISR);
  1017	
  1018		/*
  1019		 * There's not much we can do in case of overrun except informing
  1020		 * the user. However, we are in interrupt context here, hence the
  1021		 * use of dev_dbg().
  1022		 */
  1023		if (isr &
  1024		    (ATMEL_HLCDC_LAYER_OVR_IRQ(0) | ATMEL_HLCDC_LAYER_OVR_IRQ(1) |
  1025		     ATMEL_HLCDC_LAYER_OVR_IRQ(2)))
  1026			pr_warn("%s: overrun on plane %s\n", __func__, desc->name);
  1027	}
  1028	
> 1029	void xlcdc_irq_dbg(struct atmel_hlcdc_plane *plane,
  1030			   const struct atmel_hlcdc_layer_desc *desc)
  1031	{
  1032		u32 isr = atmel_hlcdc_layer_read_reg(&plane->layer, ATMEL_XLCDC_LAYER_ISR);
  1033	
  1034		/*
  1035		 * There's not much we can do in case of overrun except informing
  1036		 * the user. However, we are in interrupt context here, hence the
  1037		 * use of dev_dbg().
  1038		 */
  1039		if (isr &
  1040		    (ATMEL_XLCDC_LAYER_OVR_IRQ(0) | ATMEL_XLCDC_LAYER_OVR_IRQ(1) |
  1041		     ATMEL_XLCDC_LAYER_OVR_IRQ(2)))
  1042			pr_warn("%s: overrun on plane %s\n", __func__, desc->name);
  1043	}
  1044	

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