Hi Carlis, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on staging/staging-testing] [also build test WARNING on v5.11-rc5 next-20210125] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Carlis/fbtft-add-tearing-signal-detect/20210125-210428 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git ec52736c35f29ed96a45e641dd6aad61bc9cb6f7 config: x86_64-randconfig-r034-20210126 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 925ae8c790c7e354f12ec14a6cac6aa49fc75b29) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/480797ed48b87555bb31a8a07b600959b53fe643 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Carlis/fbtft-add-tearing-signal-detect/20210125-210428 git checkout 480797ed48b87555bb31a8a07b600959b53fe643 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/staging/fbtft/fb_st7789v.c:216:5: warning: no previous prototype for function 'st7789v_write_vmem16_bus8' [-Wmissing-prototypes] int st7789v_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len) ^ drivers/staging/fbtft/fb_st7789v.c:216:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int st7789v_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len) ^ static 1 warning generated. vim +/st7789v_write_vmem16_bus8 +216 drivers/staging/fbtft/fb_st7789v.c 208 209 /***************************************************************************** 210 * 211 * int (*write_vmem)(struct fbtft_par *par); 212 * 213 *****************************************************************************/ 214 215 /* 16 bit pixel over 8-bit databus */ > 216 int st7789v_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len) 217 { 218 u16 *vmem16; 219 __be16 *txbuf16 = par->txbuf.buf; 220 size_t remain; 221 size_t to_copy; 222 size_t tx_array_size; 223 int i; 224 int rc, ret = 0; 225 size_t startbyte_size = 0; 226 227 fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "st7789v ---%s(offset=%zu, len=%zu)\n", 228 __func__, offset, len); 229 230 remain = len / 2; 231 vmem16 = (u16 *)(par->info->screen_buffer + offset); 232 233 if (par->gpio.dc) 234 gpiod_set_value(par->gpio.dc, 1); 235 236 /* non buffered write */ 237 if (!par->txbuf.buf) 238 return par->fbtftops.write(par, vmem16, len); 239 240 /* buffered write */ 241 tx_array_size = par->txbuf.len / 2; 242 243 if (par->startbyte) { 244 txbuf16 = par->txbuf.buf + 1; 245 tx_array_size -= 2; 246 *(u8 *)(par->txbuf.buf) = par->startbyte | 0x2; 247 startbyte_size = 1; 248 } 249 250 while (remain) { 251 to_copy = min(tx_array_size, remain); 252 dev_dbg(par->info->device, " to_copy=%zu, remain=%zu\n", 253 to_copy, remain - to_copy); 254 255 for (i = 0; i < to_copy; i++) 256 txbuf16[i] = cpu_to_be16(vmem16[i]); 257 258 vmem16 = vmem16 + to_copy; 259 if (par->gpio.te) { 260 enable_spi_panel_te_irq(par, true); 261 reinit_completion(&spi_panel_te); 262 rc = wait_for_completion_timeout(&spi_panel_te, 263 msecs_to_jiffies(SPI_PANEL_TE_TIMEOUT)); 264 if (rc == 0) 265 pr_err("wait panel TE time out\n"); 266 } 267 ret = par->fbtftops.write(par, par->txbuf.buf, 268 startbyte_size + to_copy * 2); 269 if (par->gpio.te) 270 enable_spi_panel_te_irq(par, false); 271 if (ret < 0) 272 return ret; 273 remain -= to_copy; 274 } 275 276 return ret; 277 } 278 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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