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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Date:   Tue, 6 Sep 2022 02:03:57 +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

Hi Fangzhi,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7e18e42e4b280c85b76967a9106a13ca61c16179
commit: 61452908a79ec936660494fb4b9f2a35ee42e6e0 drm/amd/display: Add DP 2.0 Audio Package Generator
date:   1 year ago
config: i386-buildonly-randconfig-r004-20220905 (https://download.01.org/0day-ci/archive/20220906/202209060159.tIsVfTJM-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce (this is a W=1 build):
        # 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
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/

If you fix the issue, kindly add following tag where applicable
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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