Hi, Thank you for the patch! Yet something to improve: [auto build test ERROR on linux/master] [also build test ERROR on drm-intel/for-linux-next drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next drm-tip/drm-tip linus/master v5.10-rc6 next-20201127] [cannot apply to drm/drm-next] [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/mdurnev-gmail-com/drm-mipi-dbi-Type-B-bus-support-drm-tiny-MRB2801/20201130-142812 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 09162bc32c880a791c6c0668ce0745cf7958f576 config: arm64-randconfig-r024-20201130 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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 # https://github.com/0day-ci/linux/commit/5883e05578f8008b00a270e8f4ebe9cb7e06a6b6 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review mdurnev-gmail-com/drm-mipi-dbi-Type-B-bus-support-drm-tiny-MRB2801/20201130-142812 git checkout 5883e05578f8008b00a270e8f4ebe9cb7e06a6b6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): drivers/gpu/drm/drm_mipi_dbi.c: In function 'mipi_dbi_gpio_init': >> drivers/gpu/drm/drm_mipi_dbi.c:1266:6: error: implicit declaration of function 'mipi_dbi_machine_little_endian' [-Werror=implicit-function-declaration] 1266 | if (mipi_dbi_machine_little_endian()) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/mipi_dbi_machine_little_endian +1266 drivers/gpu/drm/drm_mipi_dbi.c 12265315ac41a3e Mikhail Durnev 2020-11-30 1234 12265315ac41a3e Mikhail Durnev 2020-11-30 1235 /** 12265315ac41a3e Mikhail Durnev 2020-11-30 1236 * mipi_dbi_gpio_init - Initialize MIPI DBI Type B interface implemented via GPIO 12265315ac41a3e Mikhail Durnev 2020-11-30 1237 * @dbi: MIPI DBI structure to initialize 12265315ac41a3e Mikhail Durnev 2020-11-30 1238 * @dc: D/C gpio 12265315ac41a3e Mikhail Durnev 2020-11-30 1239 * @wr: W/R gpio 12265315ac41a3e Mikhail Durnev 2020-11-30 1240 * @db: DB gpios 12265315ac41a3e Mikhail Durnev 2020-11-30 1241 * @wr_up_delay: Delay after setting DB and before changing W/R from low to high 12265315ac41a3e Mikhail Durnev 2020-11-30 1242 * @wr_down_delay: Delay after changing W/R from low to high 12265315ac41a3e Mikhail Durnev 2020-11-30 1243 * 12265315ac41a3e Mikhail Durnev 2020-11-30 1244 * This function sets &mipi_dbi->command, enables &mipi_dbi->read_commands for the 12265315ac41a3e Mikhail Durnev 2020-11-30 1245 * usual read commands. It should be followed by a call to mipi_dbi_dev_init() or 12265315ac41a3e Mikhail Durnev 2020-11-30 1246 * a driver-specific init. 12265315ac41a3e Mikhail Durnev 2020-11-30 1247 * 12265315ac41a3e Mikhail Durnev 2020-11-30 1248 * Returns: 12265315ac41a3e Mikhail Durnev 2020-11-30 1249 * Zero on success, negative error code on failure. 12265315ac41a3e Mikhail Durnev 2020-11-30 1250 */ 12265315ac41a3e Mikhail Durnev 2020-11-30 1251 int mipi_dbi_gpio_init(struct mipi_dbi *dbi, struct gpio_desc *dc, 12265315ac41a3e Mikhail Durnev 2020-11-30 1252 struct gpio_desc *wr, struct gpio_descs *db, 12265315ac41a3e Mikhail Durnev 2020-11-30 1253 unsigned long wr_up_delay, unsigned long wr_down_delay) 12265315ac41a3e Mikhail Durnev 2020-11-30 1254 { 12265315ac41a3e Mikhail Durnev 2020-11-30 1255 dbi->spi = NULL; /* Type B uses GPIO lines rather than SPI */ 12265315ac41a3e Mikhail Durnev 2020-11-30 1256 12265315ac41a3e Mikhail Durnev 2020-11-30 1257 dbi->read_commands = mipi_dbi_dcs_read_commands; 12265315ac41a3e Mikhail Durnev 2020-11-30 1258 dbi->command = mipi_dbi_gpio_command; 12265315ac41a3e Mikhail Durnev 2020-11-30 1259 12265315ac41a3e Mikhail Durnev 2020-11-30 1260 dbi->dc = dc; 12265315ac41a3e Mikhail Durnev 2020-11-30 1261 dbi->wr = wr; 12265315ac41a3e Mikhail Durnev 2020-11-30 1262 dbi->db = db; 12265315ac41a3e Mikhail Durnev 2020-11-30 1263 dbi->wr_up_delay = wr_up_delay; 12265315ac41a3e Mikhail Durnev 2020-11-30 1264 dbi->wr_down_delay = wr_down_delay; 12265315ac41a3e Mikhail Durnev 2020-11-30 1265 12265315ac41a3e Mikhail Durnev 2020-11-30 @1266 if (mipi_dbi_machine_little_endian()) 12265315ac41a3e Mikhail Durnev 2020-11-30 1267 dbi->swap_bytes = true; 12265315ac41a3e Mikhail Durnev 2020-11-30 1268 12265315ac41a3e Mikhail Durnev 2020-11-30 1269 mutex_init(&dbi->cmdlock); 12265315ac41a3e Mikhail Durnev 2020-11-30 1270 12265315ac41a3e Mikhail Durnev 2020-11-30 1271 return 0; 12265315ac41a3e Mikhail Durnev 2020-11-30 1272 } 12265315ac41a3e Mikhail Durnev 2020-11-30 1273 EXPORT_SYMBOL(mipi_dbi_gpio_init); 12265315ac41a3e Mikhail Durnev 2020-11-30 1274 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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