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Date:   Sun, 28 Feb 2021 07:07:07 +0800
From:   kernel test robot <lkp@...el.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: drivers/gpu/drm/kmb/kmb_dsi.c:812:2: warning: unused function
 'set_test_mode_src_osc_freq_target_low_bits'

Hi Geert,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5695e51619745d4fe3ec2506a2f0cd982c5e27a4
commit: ade896460e4a62f5e4a892a98d254937f6f5b64c drm: DRM_KMB_DISPLAY should depend on ARCH_KEEMBAY
date:   4 months ago
config: mips-randconfig-r004-20210228 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 83bc7815c4235786111aa2abf7193292e4a602f5)
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 mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ade896460e4a62f5e4a892a98d254937f6f5b64c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout ade896460e4a62f5e4a892a98d254937f6f5b64c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

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/kmb/kmb_dsi.c:812:2: warning: unused function 'set_test_mode_src_osc_freq_target_low_bits'
   set_test_mode_src_osc_freq_target_low_bits(struct kmb_dsi
   ^
>> drivers/gpu/drm/kmb/kmb_dsi.c:824:2: warning: unused function 'set_test_mode_src_osc_freq_target_hi_bits'
   set_test_mode_src_osc_freq_target_hi_bits(struct kmb_dsi
   ^
   fatal error: error in backend: Nested variants found in inline asm string: '.if ( 0x00 ) != -1)) 0x00 ) != -1)) : ($( static struct ftrace_branch_data __attribute__((__aligned__(4))) __attribute__((__section__("_ftrace_branch"))) __if_trace = $( .func = __func__, .file = "arch/mips/include/asm/barrier.h", .line = 16, $); 0x00 ) != -1)) : $))) ) && ( (1 << 0) ); .set push; .set mips64r2; .rept 1; sync 0x00; .endr; .set pop; .else; ; .endif'
   clang-13: error: clang frontend command failed with exit code 70 (use -v to see invocation)
   clang version 13.0.0 (git://gitmirror/llvm_project 83bc7815c4235786111aa2abf7193292e4a602f5)
   Target: mipsel-unknown-linux-gnu
   Thread model: posix
   InstalledDir: /opt/cross/clang-83bc7815c4/bin
   clang-13: note: diagnostic msg:
   Makefile arch drivers fs include kernel mm scripts security source usr


vim +/set_test_mode_src_osc_freq_target_low_bits +812 drivers/gpu/drm/kmb/kmb_dsi.c

98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  810  
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  811  static inline void
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04 @812  	set_test_mode_src_osc_freq_target_low_bits(struct kmb_dsi *kmb_dsi,
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  813  						   u32 dphy_no,
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  814  						   u32 freq)
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  815  {
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  816  	/* Typical rise/fall time=166, refer Table 1207 databook,
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  817  	 * sr_osc_freq_target[7:0]
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  818  	 */
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  819  	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_SLEW_RATE_DDL_CYCLES,
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  820  		       (freq & 0x7f));
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  821  }
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  822  
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  823  static inline void
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04 @824  	set_test_mode_src_osc_freq_target_hi_bits(struct kmb_dsi *kmb_dsi,
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  825  						  u32 dphy_no,
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  826  						  u32 freq)
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  827  {
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  828  	u32 data;
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  829  
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  830  	/* Flag this as high nibble */
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  831  	data = ((freq >> 6) & 0x1f) | (1 << 7);
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  832  
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  833  	/* Typical rise/fall time=166, refer Table 1207 databook,
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  834  	 * sr_osc_freq_target[11:7]
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  835  	 */
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  836  	test_mode_send(kmb_dsi, dphy_no, TEST_CODE_SLEW_RATE_DDL_CYCLES, data);
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  837  }
98521f4d4b4cb2 Anitha Chrisanthus 2020-11-04  838  

:::::: The code at line 812 was first introduced by commit
:::::: 98521f4d4b4cb265374a4b1e13b41287a1960243 drm/kmb: Mipi DSI part of the display driver

:::::: TO: Anitha Chrisanthus <anitha.chrisanthus@...el.com>
:::::: CC: Sam Ravnborg <sam@...nborg.org>

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

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