[linux-next:master 5435/5886] drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:1372:16: warning: no previous prototype for function 'configure_lttpr_mode_transparent'

[kernel test robot <lkp@intel.com>]

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Hi Jimmy,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   3e029760e6f8ce90c122c267a039ae73b3f1f5a4
commit: 7211b60514f88e695080ebc4074c6affd880acb8 [5435/5886] drm/amd/display: Update DP link configuration.
config: powerpc-randconfig-r023-20210528 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 6505c630407c5feec818f0bb1c284f9eeebf2071)
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
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=7211b60514f88e695080ebc4074c6affd880acb8
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 7211b60514f88e695080ebc4074c6affd880acb8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 

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:1372:16: warning: no previous prototype for function 'configure_lttpr_mode_transparent' [-Wmissing-prototypes]
   enum dc_status configure_lttpr_mode_transparent(struct dc_link *link)
                  ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:1372:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   enum dc_status configure_lttpr_mode_transparent(struct dc_link *link)
   ^
   static 
>> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:1383:16: warning: no previous prototype for function 'configure_lttpr_mode_non_transparent' [-Wmissing-prototypes]
   enum dc_status configure_lttpr_mode_non_transparent(
                  ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:1383:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   enum dc_status configure_lttpr_mode_non_transparent(
   ^
   static 
   2 warnings generated.


vim +/configure_lttpr_mode_transparent +1372 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c

  1371	
> 1372	enum dc_status configure_lttpr_mode_transparent(struct dc_link *link)
  1373	{
  1374		uint8_t repeater_mode = DP_PHY_REPEATER_MODE_TRANSPARENT;
  1375	
  1376		DC_LOG_HW_LINK_TRAINING("%s\n Set LTTPR to Transparent Mode\n", __func__);
  1377		return core_link_write_dpcd(link,
  1378				DP_PHY_REPEATER_MODE,
  1379				(uint8_t *)&repeater_mode,
  1380				sizeof(repeater_mode));
  1381	}
  1382	
> 1383	enum dc_status configure_lttpr_mode_non_transparent(
  1384			struct dc_link *link,
  1385			const struct link_training_settings *lt_settings)
  1386	{
  1387		/* aux timeout is already set to extended */
  1388		/* RESET/SET lttpr mode to enable non transparent mode */
  1389		uint8_t repeater_cnt;
  1390		uint32_t aux_interval_address;
  1391		uint8_t repeater_id;
  1392		enum dc_status result = DC_ERROR_UNEXPECTED;
  1393		uint8_t repeater_mode = DP_PHY_REPEATER_MODE_TRANSPARENT;
  1394	
  1395		enum dp_link_encoding encoding = dp_get_link_encoding_format(&lt_settings->link_settings);
  1396	
  1397		if (encoding == DP_8b_10b_ENCODING) {
  1398			DC_LOG_HW_LINK_TRAINING("%s\n Set LTTPR to Transparent Mode\n", __func__);
  1399			result = core_link_write_dpcd(link,
  1400					DP_PHY_REPEATER_MODE,
  1401					(uint8_t *)&repeater_mode,
  1402					sizeof(repeater_mode));
  1403	
  1404		}
  1405	
  1406		if (result == DC_OK) {
  1407			link->dpcd_caps.lttpr_caps.mode = repeater_mode;
  1408		}
  1409	
  1410		if (link->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT) {
  1411	
  1412			DC_LOG_HW_LINK_TRAINING("%s\n Set LTTPR to Non Transparent Mode\n", __func__);
  1413	
  1414			repeater_mode = DP_PHY_REPEATER_MODE_NON_TRANSPARENT;
  1415			result = core_link_write_dpcd(link,
  1416					DP_PHY_REPEATER_MODE,
  1417					(uint8_t *)&repeater_mode,
  1418					sizeof(repeater_mode));
  1419	
  1420			if (result == DC_OK) {
  1421				link->dpcd_caps.lttpr_caps.mode = repeater_mode;
  1422			}
  1423	
  1424			if (encoding == DP_8b_10b_ENCODING) {
  1425				repeater_cnt = dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt);
  1426				for (repeater_id = repeater_cnt; repeater_id > 0; repeater_id--) {
  1427					aux_interval_address = DP_TRAINING_AUX_RD_INTERVAL_PHY_REPEATER1 +
  1428								((DP_REPEATER_CONFIGURATION_AND_STATUS_SIZE) * (repeater_id - 1));
  1429					core_link_read_dpcd(
  1430						link,
  1431						aux_interval_address,
  1432						(uint8_t *)&link->dpcd_caps.lttpr_caps.aux_rd_interval[repeater_id - 1],
  1433						sizeof(link->dpcd_caps.lttpr_caps.aux_rd_interval[repeater_id - 1]));
  1434					link->dpcd_caps.lttpr_caps.aux_rd_interval[repeater_id - 1] &= 0x7F;
  1435				}
  1436			}
  1437		}
  1438	
  1439		return result;
  1440	}
  1441	

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

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