tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.4 head: 5e1df3aa3a56e2423836034028e6d4eb3867491c commit: 125c33517b95919082894a61e3b95ebdbf565203 [64/71] BACKPORT: drm/dp: Introduce EDID-based quirks config: x86_64-randconfig-m031-20200807 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; smatch warnings: drivers/gpu/drm/drm_dp_helper.c:1295 drm_dp_get_edid_quirks() warn: we never enter this loop vim +1295 drivers/gpu/drm/drm_dp_helper.c 1270 1271 /** 1272 * drm_dp_get_edid_quirks() - Check the EDID of a DP device to find additional 1273 * DP-specific quirks 1274 * @edid: The EDID to check 1275 * 1276 * While OUIDs are meant to be used to recognize a DisplayPort device, a lot 1277 * of manufacturers don't seem to like following standards and neglect to fill 1278 * the dev-ID in, making it impossible to only use OUIDs for determining 1279 * quirks in some cases. This function can be used to check the EDID and look 1280 * up any additional DP quirks. The bits returned by this function correspond 1281 * to the quirk bits in &drm_dp_quirk. 1282 * 1283 * Returns: a bitmask of quirks, if any. The driver can check this using 1284 * drm_dp_has_quirk(). 1285 */ 1286 u32 drm_dp_get_edid_quirks(const struct edid *edid) 1287 { 1288 const struct edid_quirk *quirk; 1289 u32 quirks = 0; 1290 int i; 1291 1292 if (!edid) 1293 return 0; 1294 1296 quirk = &edid_quirk_list[i]; 1297 if (memcmp(quirk->mfg_id, edid->mfg_id, 1298 sizeof(edid->mfg_id)) == 0 && 1299 memcmp(quirk->prod_id, edid->prod_code, 1300 sizeof(edid->prod_code)) == 0) 1301 quirks |= quirk->quirks; 1302 } 1303 1304 DRM_DEBUG_KMS("DP sink: EDID mfg %*phD prod-ID %*phD quirks: 0x%04x\n", 1305 (int)sizeof(edid->mfg_id), edid->mfg_id, 1306 (int)sizeof(edid->prod_code), edid->prod_code, quirks); 1307 1308 return quirks; 1309 } 1310 EXPORT_SYMBOL(drm_dp_get_edid_quirks); 1311 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org