Hi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linux/master] [also build test WARNING on robh/for-next drm-intel/for-linux-next drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next linus/master v5.10-rc4 next-20201118] [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-MRB2801/20201118-153901 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 09162bc32c880a791c6c0668ce0745cf7958f576 config: alpha-randconfig-s032-20201118 (attached as .config) compiler: alpha-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-107-gaf3512a6-dirty # https://github.com/0day-ci/linux/commit/f75093067b26ff68b2de896f317a03a10d8bc7ff 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-MRB2801/20201118-153901 git checkout f75093067b26ff68b2de896f317a03a10d8bc7ff # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=alpha If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> "sparse warnings: (new ones prefixed by >>)" >> drivers/gpu/drm/drm_mipi_dbi.c:1255:20: sparse: sparse: Using plain integer as NULL pointer vim +1255 drivers/gpu/drm/drm_mipi_dbi.c 1234 1235 /** 1236 * mipi_dbi_gpio_init - Initialize MIPI DBI Type B interface implemented via GPIO 1237 * @dbi: MIPI DBI structure to initialize 1238 * @dc: D/C gpio 1239 * @wr: W/R gpio 1240 * @db: DB gpios 1241 * @wr_up_delay: Delay after setting DB and before changing W/R from low to high 1242 * @wr_down_delay: Delay after changing W/R from low to high 1243 * 1244 * This function sets &mipi_dbi->command, enables &mipi_dbi->read_commands for the 1245 * usual read commands. It should be followed by a call to mipi_dbi_dev_init() or 1246 * a driver-specific init. 1247 * 1248 * Returns: 1249 * Zero on success, negative error code on failure. 1250 */ 1251 int mipi_dbi_gpio_init(struct mipi_dbi *dbi, struct gpio_desc *dc, 1252 struct gpio_desc *wr, struct gpio_descs *db, 1253 unsigned long wr_up_delay, unsigned long wr_down_delay) 1254 { > 1255 dbi->spi = 0; /* Type B uses GPIO lines rather than SPI */ 1256 1257 dbi->read_commands = mipi_dbi_dcs_read_commands; 1258 dbi->command = mipi_dbi_gpio_command; 1259 1260 dbi->dc = dc; 1261 dbi->wr = wr; 1262 dbi->db = db; 1263 dbi->wr_up_delay = wr_up_delay; 1264 dbi->wr_down_delay = wr_down_delay; 1265 1266 if (mipi_dbi_machine_little_endian()) 1267 dbi->swap_bytes = true; 1268 1269 mutex_init(&dbi->cmdlock); 1270 1271 return 0; 1272 } 1273 EXPORT_SYMBOL(mipi_dbi_gpio_init); 1274 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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