[agd5f:drm-next 67/96] drivers/gpu/drm/amd/amdgpu/../display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c:618:6: warning: no previous prototype for 'dcn31_set_low_power_state'

[kernel test robot]

tree:   https://gitlab.freedesktop.org/agd5f/linux.git drm-next
head:   e45422695c196dbc665a95526c85ff4b8752aff2
commit: 06bab5897c51e15d9a6b7ec11b1eacc4f2e1a145 [67/96] drm/amd/display: Power down hardware if timer not trigger
config: powerpc64-randconfig-s032-20220402 (https://download.01.org/0day-ci/archive/20220402/202204022040.87CAsqVS-lkp@xxxxxxxxx/config)
compiler: powerpc64-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        git remote add agd5f https://gitlab.freedesktop.org/agd5f/linux.git
        git fetch --no-tags agd5f drm-next
        git checkout 06bab5897c51e15d9a6b7ec11b1eacc4f2e1a145
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=powerpc SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/amd/amdgpu/../display/dmub/dmub_srv.h:67,
                    from drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.h:30,
                    from drivers/gpu/drm/amd/amdgpu/../display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c:49:
   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:3049:26: warning: variable 'temp' set but not used [-Wunused-but-set-variable]
    3049 |                 uint64_t temp;
         |                          ^~~~
   drivers/gpu/drm/amd/amdgpu/../display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c: At top level:
>> drivers/gpu/drm/amd/amdgpu/../display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c:618:6: warning: no previous prototype for 'dcn31_set_low_power_state' [-Wmissing-prototypes]
     618 | void dcn31_set_low_power_state(struct clk_mgr *clk_mgr_base)
         |      ^~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/inc/core_types.h:32,
                    from drivers/gpu/drm/amd/amdgpu/../display/dc/inc/resource.h:28,
                    from drivers/gpu/drm/amd/amdgpu/../display/dc/inc/hw/clk_mgr_internal.h:36,
                    from drivers/gpu/drm/amd/amdgpu/../display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c:29:
   drivers/gpu/drm/amd/amdgpu/../display/include/ddc_service_types.h:129:22: warning: 'SYNAPTICS_DEVICE_ID' defined but not used [-Wunused-const-variable=]
     129 | static const uint8_t SYNAPTICS_DEVICE_ID[] = "SYNA";
         |                      ^~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/../display/include/ddc_service_types.h:126:22: warning: 'DP_SINK_DEVICE_STR_ID_2' defined but not used [-Wunused-const-variable=]
     126 | 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:125:22: warning: 'DP_SINK_DEVICE_STR_ID_1' defined but not used [-Wunused-const-variable=]
     125 | static const uint8_t DP_SINK_DEVICE_STR_ID_1[] = {7, 1, 8, 7, 3, 0};
         |                      ^~~~~~~~~~~~~~~~~~~~~~~


vim +/dcn31_set_low_power_state +618 drivers/gpu/drm/amd/amdgpu/../display/dc/clk_mgr/dcn31/dcn31_clk_mgr.c

   617	
 > 618	void dcn31_set_low_power_state(struct clk_mgr *clk_mgr_base)
   619	{
   620		int display_count;
   621		struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base);
   622		struct dc *dc = clk_mgr_base->ctx->dc;
   623		struct dc_state *context = dc->current_state;
   624	
   625		if (clk_mgr_base->clks.pwr_state != DCN_PWR_STATE_LOW_POWER) {
   626			display_count = dcn31_get_active_display_cnt_wa(dc, context);
   627			/* if we can go lower, go lower */
   628			if (display_count == 0) {
   629				union display_idle_optimization_u idle_info = { 0 };
   630	
   631				idle_info.idle_info.df_request_disabled = 1;
   632				idle_info.idle_info.phy_ref_clk_off = 1;
   633				idle_info.idle_info.s0i2_rdy = 1;
   634				dcn31_smu_set_display_idle_optimization(clk_mgr, idle_info.data);
   635				/* update power state */
   636				clk_mgr_base->clks.pwr_state = DCN_PWR_STATE_LOW_POWER;
   637			}
   638		}
   639	}
   640	

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