[linux-next:master 2992/4407] drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c:924:6: warning: no previous prototype for function 'dce110_edp_wait_for_T12'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   b4bb878f3eb3e604ebfe83bbc17eb7af8d99cbf4
commit: cf3a2627597794797ce5930537c0e75df284b6e9 [2992/4407] drm/amd/display: implement T12 compliance
config: powerpc-randconfig-r026-20210119 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 22b68440e1647e16b5ee24b924986207173c02d1)
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=cf3a2627597794797ce5930537c0e75df284b6e9
        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 cf3a2627597794797ce5930537c0e75df284b6e9
        # 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/dce110/dce110_hw_sequencer.c:924:6: warning: no previous prototype for function 'dce110_edp_wait_for_T12' [-Wmissing-prototypes]
   void dce110_edp_wait_for_T12(
        ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c:924:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void dce110_edp_wait_for_T12(
   ^
   static 
   1 warning generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for ATA
   Depends on HAS_IOMEM && BLOCK
   Selected by
   - AKEBONO && PPC_47x
   WARNING: unmet direct dependencies detected for FAILOVER
   Depends on NET
   Selected by
   - NET_FAILOVER && NETDEVICES
   WARNING: unmet direct dependencies detected for PAGE_POOL
   Depends on NET
   Selected by
   - MVNETA && NETDEVICES && ETHERNET && NET_VENDOR_MARVELL && (ARCH_MVEBU || COMPILE_TEST
   - MVPP2 && NETDEVICES && ETHERNET && NET_VENDOR_MARVELL && (ARCH_MVEBU || COMPILE_TEST
   WARNING: unmet direct dependencies detected for NET_DEVLINK
   Depends on NET
   Selected by
   - ICE && NETDEVICES && ETHERNET && NET_VENDOR_INTEL && PCI_MSI
   WARNING: unmet direct dependencies detected for NETDEVICES
   Depends on NET
   Selected by
   - AKEBONO && PPC_47x
   WARNING: unmet direct dependencies detected for ETHERNET
   Depends on NETDEVICES && NET
   Selected by
   - AKEBONO && PPC_47x
   WARNING: unmet direct dependencies detected for PTP_1588_CLOCK_PCH
   Depends on (X86_32 || COMPILE_TEST && HAS_IOMEM && NET
   Selected by
   - PCH_GBE && NETDEVICES && ETHERNET && NET_VENDOR_OKI && PCI && (X86_32 || COMPILE_TEST
   WARNING: unmet direct dependencies detected for MMC_SDHCI
   Depends on MMC && HAS_DMA
   Selected by
   - AKEBONO && PPC_47x
   WARNING: unmet direct dependencies detected for MMC_SDHCI_PLTFM
   Depends on MMC && MMC_SDHCI
   Selected by
   - AKEBONO && PPC_47x
   WARNING: unmet direct dependencies detected for NET_PTP_CLASSIFY
   Depends on NET
   Selected by
   - PCH_GBE && NETDEVICES && ETHERNET && NET_VENDOR_OKI && PCI && (X86_32 || COMPILE_TEST
   WARNING: unmet direct dependencies detected for GRO_CELLS
   Depends on NET
   Selected by
   - MACSEC && NETDEVICES && NET_CORE
   WARNING: unmet direct dependencies detected for HWBM
   Depends on NET
   Selected by
   - MVNETA_BM && NETDEVICES && ETHERNET && NET_VENDOR_MARVELL && !64BIT


vim +/dce110_edp_wait_for_T12 +924 drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_hw_sequencer.c

   923	
 > 924	void dce110_edp_wait_for_T12(
   925			struct dc_link *link)
   926	{
   927		struct dc_context *ctx = link->ctx;
   928	
   929		if (dal_graphics_object_id_get_connector_id(link->link_enc->connector)
   930				!= CONNECTOR_ID_EDP) {
   931			BREAK_TO_DEBUGGER();
   932			return;
   933		}
   934	
   935		if (!link->panel_cntl)
   936			return;
   937	
   938		if (!link->panel_cntl->funcs->is_panel_powered_on(link->panel_cntl) &&
   939				link->link_trace.time_stamp.edp_poweroff != 0) {
   940			unsigned int t12_duration = 500; // Default T12 as per spec
   941			unsigned long long current_ts = dm_get_timestamp(ctx);
   942			unsigned long long time_since_edp_poweroff_ms =
   943					div64_u64(dm_get_elapse_time_in_ns(
   944							ctx,
   945							current_ts,
   946							link->link_trace.time_stamp.edp_poweroff), 1000000);
   947	
   948			t12_duration += link->local_sink->edid_caps.panel_patch.extra_t12_ms; // Add extra T12
   949	
   950			if (time_since_edp_poweroff_ms < t12_duration)
   951				msleep(t12_duration - time_since_edp_poweroff_ms);
   952		}
   953	}
   954	

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

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