linux-kernel - drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:4343: warning: expecting prototype for Return PCON's post FRL link training supported BW if its non(). Prototype was for intersect_frl_link_bw

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Date:   Fri, 14 Jan 2022 17:13:25 +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/core/dc_link_dp.c:4343:
 warning: expecting prototype for Return PCON's post FRL link training
 supported BW if its non(). Prototype was for intersect_frl_link_bw_support()
 instead

Hi Fangzhi,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   fb3b0673b7d5b477ed104949450cd511337ba3c6
commit: c022375ae0955b6d97ec438d658ab43a857a010f drm/amd/display: Add DP-HDMI FRL PCON Support in DC
date:   6 weeks ago
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220114/202201141715.OhMqGKge-lkp@intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c022375ae0955b6d97ec438d658ab43a857a010f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout c022375ae0955b6d97ec438d658ab43a857a010f
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 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/core/dc_link_dp.c:4343: warning: Function parameter or member 'max_supported_frl_bw_in_kbps' not described in 'intersect_frl_link_bw_support'
   drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:4343: warning: Function parameter or member 'hdmi_encoded_link_bw' not described in 'intersect_frl_link_bw_support'
>> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:4343: warning: expecting prototype for Return PCON's post FRL link training supported BW if its non(). Prototype was for intersect_frl_link_bw_support() instead


vim +4343 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c

  4336	
  4337	/**
  4338	 * Return PCON's post FRL link training supported BW if its non-zero, otherwise return max_supported_frl_bw.
  4339	 */
  4340	static uint32_t intersect_frl_link_bw_support(
  4341		const uint32_t max_supported_frl_bw_in_kbps,
  4342		const union hdmi_encoded_link_bw hdmi_encoded_link_bw)
> 4343	{
  4344		uint32_t supported_bw_in_kbps = max_supported_frl_bw_in_kbps;
  4345	
  4346		// HDMI_ENCODED_LINK_BW bits are only valid if HDMI Link Configuration bit is 1 (FRL mode)
  4347		if (hdmi_encoded_link_bw.bits.FRL_MODE) {
  4348			if (hdmi_encoded_link_bw.bits.BW_48Gbps)
  4349				supported_bw_in_kbps = 48000000;
  4350			else if (hdmi_encoded_link_bw.bits.BW_40Gbps)
  4351				supported_bw_in_kbps = 40000000;
  4352			else if (hdmi_encoded_link_bw.bits.BW_32Gbps)
  4353				supported_bw_in_kbps = 32000000;
  4354			else if (hdmi_encoded_link_bw.bits.BW_24Gbps)
  4355				supported_bw_in_kbps = 24000000;
  4356			else if (hdmi_encoded_link_bw.bits.BW_18Gbps)
  4357				supported_bw_in_kbps = 18000000;
  4358			else if (hdmi_encoded_link_bw.bits.BW_9Gbps)
  4359				supported_bw_in_kbps = 9000000;
  4360		}
  4361	
  4362		return supported_bw_in_kbps;
  4363	}
  4364	#endif
  4365	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org