[agd5f:drm-next 150/190] drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:213:6: warning: no previous prototype for 'retrieve_downstream_port_device'

[kernel test robot <lkp@intel.com>]

tree:   https://gitlab.freedesktop.org/agd5f/linux.git drm-next
head:   63e583c8843f305a3e334a96d5de00435f4d38a2
commit: 09db246ceef70bc6bd9c3e0d02b3c855f8fc25fb [150/190] drm/amd/display: Retrieve MST Downstream Port Status
config: x86_64-buildonly-randconfig-r001-20220124 (https://download.01.org/0day-ci/archive/20220126/202201261139.VvN01ApM-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        git remote add agd5f https://gitlab.freedesktop.org/agd5f/linux.git
        git fetch --no-tags agd5f drm-next
        git checkout 09db246ceef70bc6bd9c3e0d02b3c855f8fc25fb
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/

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 >>):

   In file included from drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:43:
   drivers/gpu/drm/amd/amdgpu/../display/dmub/inc/dmub_cmd.h: In function 'dmub_rb_flush_pending':
   drivers/gpu/drm/amd/amdgpu/../display/dmub/inc/dmub_cmd.h:2918:12: warning: variable 'temp' set but not used [-Wunused-but-set-variable]
    2918 |   uint64_t temp;
         |            ^~~~
   drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c: At top level:
>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:213:6: warning: no previous prototype for 'retrieve_downstream_port_device' [-Wmissing-prototypes]
     213 | bool retrieve_downstream_port_device(struct amdgpu_dm_connector *aconnector)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/inc/dc_link_ddc.h:29,
                    from drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c:38:
   drivers/gpu/drm/amd/amdgpu/../display/include/ddc_service_types.h:124:22: warning: 'DP_SINK_DEVICE_STR_ID_2' defined but not used [-Wunused-const-variable=]
     124 | static const uint8_t DP_SINK_DEVICE_STR_ID_2[] = {7, 1, 8, 7, 5, 0};
         |                      ^~~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../display/include/ddc_service_types.h:123:22: warning: 'DP_SINK_DEVICE_STR_ID_1' defined but not used [-Wunused-const-variable=]
     123 | static const uint8_t DP_SINK_DEVICE_STR_ID_1[] = {7, 1, 8, 7, 3, 0};
         |                      ^~~~~~~~~~~~~~~~~~~~~~~


vim +/retrieve_downstream_port_device +213 drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_mst_types.c

   212	
 > 213	bool retrieve_downstream_port_device(struct amdgpu_dm_connector *aconnector)
   214	{
   215		union dp_downstream_port_present ds_port_present;
   216	
   217		if (!aconnector->dsc_aux)
   218			return false;
   219	
   220		if (drm_dp_dpcd_read(aconnector->dsc_aux, DP_DOWNSTREAMPORT_PRESENT, &ds_port_present, 1) < 0) {
   221			DRM_INFO("Failed to read downstream_port_present 0x05 from DFP of branch device\n");
   222			return false;
   223		}
   224	
   225		aconnector->mst_downstream_port_present = ds_port_present;
   226		DRM_INFO("Downstream port present %d, type %d\n",
   227				ds_port_present.fields.PORT_PRESENT, ds_port_present.fields.PORT_TYPE);
   228	
   229		return true;
   230	}
   231	#endif
   232	

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