linux-kernel - drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_hpo_dp_stream_encoder.c:439:14: warning: variable 'sdp_stream

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Message-ID: <202209060420.Wzjr6Sj2-lkp@intel.com>
Date:   Tue, 6 Sep 2022 04:52:10 +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_hpo_dp_stream_encoder.c:439:14:
 warning: variable 'sdp_stream_enable' 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: 83228ebb82e4fe2e5513f35d9b0b0eded3c44cbc drm/amd/display: Add DP 2.0 HPO Stream Encoder
date:   1 year ago
config: i386-buildonly-randconfig-r004-20220905 (https://download.01.org/0day-ci/archive/20220906/202209060420.Wzjr6Sj2-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=83228ebb82e4fe2e5513f35d9b0b0eded3c44cbc
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 83228ebb82e4fe2e5513f35d9b0b0eded3c44cbc
        # 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_hpo_dp_stream_encoder.c: In function 'dcn31_hpo_dp_stream_enc_update_dp_info_packets':
>> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_hpo_dp_stream_encoder.c:439:14: warning: variable 'sdp_stream_enable' set but not used [-Wunused-but-set-variable]
     439 |         bool sdp_stream_enable = false;
         |              ^~~~~~~~~~~~~~~~~


vim +/sdp_stream_enable +439 drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_hpo_dp_stream_encoder.c

   432	
   433	static void dcn31_hpo_dp_stream_enc_update_dp_info_packets(
   434			struct hpo_dp_stream_encoder *enc,
   435			const struct encoder_info_frame *info_frame)
   436	{
   437		struct dcn31_hpo_dp_stream_encoder *enc3 = DCN3_1_HPO_DP_STREAM_ENC_FROM_HPO_STREAM_ENC(enc);
   438		uint32_t dmdata_packet_enabled = 0;
 > 439		bool sdp_stream_enable = false;
   440	
   441		if (info_frame->vsc.valid) {
   442			enc->vpg->funcs->update_generic_info_packet(
   443					enc->vpg,
   444					0,  /* packetIndex */
   445					&info_frame->vsc);
   446			sdp_stream_enable = true;
   447		}
   448		if (info_frame->spd.valid) {
   449			enc->vpg->funcs->update_generic_info_packet(
   450					enc->vpg,
   451					2,  /* packetIndex */
   452					&info_frame->spd);
   453			sdp_stream_enable = true;
   454		}
   455		if (info_frame->hdrsmd.valid) {
   456			enc->vpg->funcs->update_generic_info_packet(
   457					enc->vpg,
   458					3,  /* packetIndex */
   459					&info_frame->hdrsmd);
   460			sdp_stream_enable = true;
   461		}
   462		/* enable/disable transmission of packet(s).
   463		 * If enabled, packet transmission begins on the next frame
   464		 */
   465		REG_UPDATE(DP_SYM32_ENC_SDP_GSP_CONTROL0, GSP_VIDEO_CONTINUOUS_TRANSMISSION_ENABLE, info_frame->vsc.valid);
   466		REG_UPDATE(DP_SYM32_ENC_SDP_GSP_CONTROL2, GSP_VIDEO_CONTINUOUS_TRANSMISSION_ENABLE, info_frame->spd.valid);
   467		REG_UPDATE(DP_SYM32_ENC_SDP_GSP_CONTROL3, GSP_VIDEO_CONTINUOUS_TRANSMISSION_ENABLE, info_frame->hdrsmd.valid);
   468	
   469		/* check if dynamic metadata packet transmission is enabled */
   470		REG_GET(DP_SYM32_ENC_SDP_METADATA_PACKET_CONTROL,
   471				METADATA_PACKET_ENABLE, &dmdata_packet_enabled);
   472	
   473		/* Enable secondary data path */
   474		REG_UPDATE(DP_SYM32_ENC_SDP_CONTROL,
   475				SDP_STREAM_ENABLE, 1);
   476	}
   477	

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