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Subjectdrivers/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@intel.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

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