linux-kernel - [agd5f:drm-next 151/201] 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

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Message-ID: <202204242243.jhz4z3rX-lkp@intel.com>
Date:   Sun, 24 Apr 2022 22:10:13 +0800
From:   kernel test robot <lkp@...el.com>
To:     Paul Hsieh <paul.hsieh@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Alex Deucher <alexander.deucher@....com>,
        Martin Leung <Martin.Leung@....com>
Subject: [agd5f:drm-next 151/201]
 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'

tree:   https://gitlab.freedesktop.org/agd5f/linux.git drm-next
head:   a2443ef0a8046ca98868224ee9bd6861c17e4995
commit: 593692d2de458a68c8e2326d48d1325d87947d90 [151/201] drm/amd/display: Power down hardware if timer not trigger
config: powerpc64-buildonly-randconfig-r004-20220424 (https://download.01.org/0day-ci/archive/20220424/202204242243.jhz4z3rX-lkp@intel.com/config)
compiler: powerpc64le-linux-gcc (GCC) 11.2.0
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
        git remote add agd5f https://gitlab.freedesktop.org/agd5f/linux.git
        git fetch --no-tags agd5f drm-next
        git checkout 593692d2de458a68c8e2326d48d1325d87947d90
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross W=1 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@...el.com>

All warnings (new ones prefixed by >>):

>> 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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