linux-kernel - drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_apg.c:117:18: warning: variable 'channels' set but not used

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Message-ID: <202203262252.GRTBgzPR-lkp@intel.com>
Date:   Sat, 26 Mar 2022 22:59:16 +0800
From:   kernel test robot <lkp@...el.com>
To:     Fangzhi Zuo <Jerry.Zuo@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Alex Deucher <alexander.deucher@....com>,
        Nicholas Kazlauskas <Nicholas.Kazlauskas@....com>
Subject: drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_apg.c:117:18:
 warning: variable 'channels' set but not used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   52d543b5497cf31d6baeb0bcfe5a5474c3238578
commit: 61452908a79ec936660494fb4b9f2a35ee42e6e0 drm/amd/display: Add DP 2.0 Audio Package Generator
date:   7 months ago
config: powerpc64-randconfig-r015-20220325 (https://download.01.org/0day-ci/archive/20220326/202203262252.GRTBgzPR-lkp@intel.com/config)
compiler: powerpc64-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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=61452908a79ec936660494fb4b9f2a35ee42e6e0
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 61452908a79ec936660494fb4b9f2a35ee42e6e0
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/gpu/drm/

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/dcn31/dcn31_apg.c: In function 'apg31_se_audio_setup':
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_apg.c:117:18: warning: variable 'channels' set but not used [-Wunused-but-set-variable]
     117 |         uint32_t channels = 0;
         |                  ^~~~~~~~
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_apg.c:116:18: warning: variable 'speakers' set but not used [-Wunused-but-set-variable]
     116 |         uint32_t speakers = 0;
         |                  ^~~~~~~~


vim +/channels +117 drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_apg.c

   108	
   109	static void apg31_se_audio_setup(
   110		struct apg *apg,
   111		unsigned int az_inst,
   112		struct audio_info *audio_info)
   113	{
   114		struct dcn31_apg *apg31 = DCN31_APG_FROM_APG(apg);
   115	
 > 116		uint32_t speakers = 0;
 > 117		uint32_t channels = 0;
   118	
   119		ASSERT(audio_info);
   120		/* This should not happen.it does so we don't get BSOD*/
   121		if (audio_info == NULL)
   122			return;
   123	
   124		speakers = audio_info->flags.info.ALLSPEAKERS;
   125		channels = speakers_to_channels(audio_info->flags.speaker_flags).all;
   126	
   127		/* DisplayPort only allows for one audio stream with stream ID 0 */
   128		REG_UPDATE(APG_CONTROL2, APG_DP_AUDIO_STREAM_ID, 0);
   129	
   130		/* When running in "pair mode", pairs of audio channels have their own enable
   131		 * this is for really old audio drivers */
   132		REG_UPDATE(APG_DBG_GEN_CONTROL, APG_DBG_AUDIO_CHANNEL_ENABLE, 0xF);
   133		// REG_UPDATE(APG_DBG_GEN_CONTROL, APG_DBG_AUDIO_CHANNEL_ENABLE, channels);
   134	
   135		/* Disable forced mem power off */
   136		REG_UPDATE(APG_MEM_PWR, APG_MEM_PWR_FORCE, 0);
   137	
   138		apg31_enable(apg);
   139	}
   140	

-- 
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https://01.org/lkp