[PATCH 5/8] drm/loongson: Using vbios for the LS7A2000 output initialization

[kernel test robot]

Hi Sui,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on linus/master v6.6-rc7 next-20231027]
[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/Sui-Jingfeng/drm-loongson-Introduce-a-minimal-support-for-Loongson-VBIOS/20231030-034730
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:    https://lore.kernel.org/r/20231029194607.379459-6-suijingfeng%40loongson.cn
patch subject: [PATCH 5/8] drm/loongson: Using vbios for the LS7A2000 output initialization
config: loongarch-randconfig-002-20231030 (https://download.01.org/0day-ci/archive/20231030/202310301026.haj8ZOHJ-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231030/202310301026.haj8ZOHJ-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/202310301026.haj8ZOHJ-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/loongson/lsdc_output_7a2000.c:568:1: warning: no previous prototype for 'ls7a2000_query_output_configuration' [-Wmissing-prototypes]
     568 | ls7a2000_query_output_configuration(struct drm_device *ddev, unsigned int pipe)
         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/loongson/lsdc_output_7a2000.c:498:46: warning: 'ls7a2000_encoder_helper_funcs' defined but not used [-Wunused-const-variable=]
     498 | static const struct drm_encoder_helper_funcs ls7a2000_encoder_helper_funcs = {
         |                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/loongson/lsdc_output_7a2000.c:272:39: warning: 'ls7a2000_encoder_funcs' defined but not used [-Wunused-const-variable=]
     272 | static const struct drm_encoder_funcs ls7a2000_encoder_funcs[2] = {
         |                                       ^~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/loongson/lsdc_output_7a2000.c:201:41: warning: 'ls7a2000_hdmi_connector_funcs' defined but not used [-Wunused-const-variable=]
     201 | static const struct drm_connector_funcs ls7a2000_hdmi_connector_funcs[2] = {
         |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/loongson/lsdc_output_7a2000.c:77:48: warning: 'ls7a2000_connector_helpers' defined but not used [-Wunused-const-variable=]
      77 | static const struct drm_connector_helper_funcs ls7a2000_connector_helpers = {
         |                                                ^~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/ls7a2000_query_output_configuration +568 drivers/gpu/drm/loongson/lsdc_output_7a2000.c

   559	
   560	/*
   561	 * For LS7A2000, the built-in VGA encoder is transparent. If there are
   562	 * external encoder exist, then the internal HDMI encoder MUST be enabled
   563	 * and initialized. As the internal HDMI encoder is always connected, so
   564	 * only the transmitters which take HDMI signal (such as HDMI to eDP, HDMI
   565	 * to LVDS, etc) are usable with.
   566	 */
   567	const struct lsdc_output_desc *
 > 568	ls7a2000_query_output_configuration(struct drm_device *ddev, unsigned int pipe)
   569	{
   570		enum loongson_vbios_encoder_name encoder_name = 0;
   571		bool ret;
   572	
   573		ret = loongson_vbios_query_encoder_info(ddev, pipe, NULL,
   574							&encoder_name, NULL);
   575		if (!ret)
   576			goto bailout;
   577	
   578		if (pipe == 0) {
   579			switch (encoder_name) {
   580			case ENCODER_CHIP_INTERNAL_HDMI:
   581				return &ls7a2000_hdmi_pipe0;
   582	
   583			/*
   584			 * For LS7A2000, the built-in VGA encoder is transparent.
   585			 */
   586			case ENCODER_CHIP_INTERNAL_VGA:
   587				return &ls7a2000_vga_pipe0;
   588	
   589			/*
   590			 * External display bridge exists, the internal HDMI encoder
   591			 * MUST be enabled and initialized. Please add a drm bridge
   592			 * driver, and attach to this encoder.
   593			 */
   594			default:
   595				return &ls7a2000_hdmi_pipe0;
   596			}
   597		}
   598	
   599		if (pipe == 1) {
   600			switch (encoder_name) {
   601			case ENCODER_CHIP_INTERNAL_HDMI:
   602				return &ls7a2000_hdmi_pipe1;
   603	
   604			/*
   605			 * External display bridge exists, the internal HDMI encoder
   606			 * MUST be enabled and initialized. Please add a drm bridge
   607			 * driver, and attach it to this encoder.
   608			 */
   609			default:
   610				return &ls7a2000_hdmi_pipe1;
   611			}
   612		}
   613	
   614	bailout:
   615		if (pipe == 0)
   616			return &ls7a2000_vga_pipe0;
   617	
   618		if (pipe == 1)
   619			return &ls7a2000_hdmi_pipe1;
   620	
   621		return NULL;
   622	}
   623	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki