Hi Mike, kernel test robot noticed the following build warnings:
[auto build test WARNING on 53e760d8949895390e256e723e7ee46618310361] url: https://github.com/intel-lab-lkp/linux/commits/Mike-Looijmans/dt-bindings-drm-bridge-ti-tmds181-Add-TI-TMDS181-and-SN65DP159-bindings/20250820-224316 base: 53e760d8949895390e256e723e7ee46618310361 patch link: https://lore.kernel.org/r/20250820144128.17603-3-mike.looijmans%40topic.nl patch subject: [PATCH v3 2/2] drm: bridge: Add TI tmds181 and sn65dp159 driver config: loongarch-allyesconfig (https://download.01.org/0day-ci/archive/20250821/202508211421.aywulvvk-...@intel.com/config) compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 93d24b6b7b148c47a2fa228a4ef31524fa1d9f3f) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250821/202508211421.aywulvvk-...@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <l...@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202508211421.aywulvvk-...@intel.com/ All warnings (new ones prefixed by >>): >> drivers/gpu/drm/bridge/ti-tmds181.c:292:9: warning: cast to smaller integer >> type 'enum tmds181_chip' from 'const void *' [-Wvoid-pointer-to-enum-cast] 292 | chip = (enum tmds181_chip)of_device_get_match_data(&client->dev); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1 warning generated. vim +292 drivers/gpu/drm/bridge/ti-tmds181.c 252 253 static int tmds181_probe(struct i2c_client *client) 254 { 255 struct tmds181_data *data; 256 struct gpio_desc *oe_gpio; 257 enum tmds181_chip chip; 258 int ret; 259 u32 param; 260 u8 val; 261 262 /* Check if the adapter supports the needed features */ 263 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 264 return -EIO; 265 266 data = devm_drm_bridge_alloc(&client->dev, struct tmds181_data, bridge, 267 &tmds181_bridge_funcs); 268 if (IS_ERR(data)) 269 return PTR_ERR(data); 270 271 data->client = client; 272 i2c_set_clientdata(client, data); 273 data->regmap = devm_regmap_init_i2c(client, &tmds181_regmap_config); 274 if (IS_ERR(data->regmap)) 275 return PTR_ERR(data->regmap); 276 277 /* The "OE" pin acts as a reset */ 278 oe_gpio = devm_gpiod_get_optional(&client->dev, "oe", GPIOD_OUT_LOW); 279 if (IS_ERR(oe_gpio)) { 280 ret = PTR_ERR(oe_gpio); 281 if (ret != -EPROBE_DEFER) 282 dev_err(&client->dev, "failed to acquire 'oe' gpio\n"); 283 return ret; 284 } 285 if (oe_gpio) { 286 /* Need at least 100us reset pulse */ 287 usleep_range(100, 200); 288 gpiod_set_value_cansleep(oe_gpio, 1); 289 } 290 291 /* Reading the ID also provides enough time for the reset */ > 292 chip = (enum > tmds181_chip)of_device_get_match_data(&client->dev); 293 ret = tmds181_check_id(data, &chip); 294 if (ret) 295 return ret; 296 297 /* 298 * We take care of power control, so disable the chips PM functions, and 299 * allow the DDC to run at 400kHz 300 */ 301 regmap_update_bits(data->regmap, TMDS181_REG_CTRL9, 302 TMDS181_CTRL9_SIG_EN | TMDS181_CTRL9_PD_EN | 303 TMDS181_CTRL9_HPD_AUTO_PWRDWN_DISABLE | 304 TMDS181_CTRL9_I2C_DR_CTL, 305 TMDS181_CTRL9_PD_EN | 306 TMDS181_CTRL9_HPD_AUTO_PWRDWN_DISABLE | 307 TMDS181_CTRL9_I2C_DR_CTL); 308 309 /* Apply configuration changes */ 310 if (of_property_read_bool(client->dev.of_node, "ti,source-mode")) 311 regmap_update_bits(data->regmap, TMDS181_REG_CTRLA, 312 TMDS181_CTRLA_MODE_SINK, 0); 313 if (of_property_read_bool(client->dev.of_node, "ti,sink-mode")) 314 regmap_update_bits(data->regmap, TMDS181_REG_CTRLA, 315 TMDS181_CTRLA_MODE_SINK, TMDS181_CTRLA_MODE_SINK); 316 317 /* 318 * Using the automatic modes of the chip uses considerable power as it 319 * will keep the PLL running at all times. So instead, define our own 320 * threshold for the pixel rate. This also allows to use a sane default 321 * of 200MHz pixel rate for the redriver-retimer crossover point, as the 322 * modes below 3k don't show any benefit from the retimer. 323 */ 324 data->retimer_threshold_khz = 200000; 325 if (!of_property_read_u32(client->dev.of_node, 326 "ti,retimer-threshold-hz", ¶m)) 327 data->retimer_threshold_khz = param / 1000; 328 329 /* Default to low-power redriver mode */ 330 regmap_update_bits(data->regmap, TMDS181_REG_CTRLA, 331 TMDS181_CTRLA_DEV_FUNC_MODE, 0x00); 332 333 if (of_property_read_bool(client->dev.of_node, "ti,adaptive-equalizer")) 334 regmap_update_bits(data->regmap, TMDS181_REG_CTRLA, 335 TMDS181_CTRLA_EQ_EN | TMDS181_CTRLA_EQ_ADA_EN, 336 TMDS181_CTRLA_EQ_EN | TMDS181_CTRLA_EQ_ADA_EN); 337 if (of_property_read_bool(client->dev.of_node, "ti,disable-equalizer")) 338 regmap_update_bits(data->regmap, TMDS181_REG_CTRLA, 339 TMDS181_CTRLA_EQ_EN | TMDS181_CTRLA_EQ_ADA_EN, 340 0); 341 342 switch (chip) { 343 case dp159: 344 val = 0; 345 if (!of_property_read_u32(client->dev.of_node, 346 "ti,slew-rate", ¶m)) { 347 if (param > 3) { 348 dev_err(&client->dev, "invalid slew-rate\n"); 349 return -EINVAL; 350 } 351 /* Implement 0 = slow, 3 = fast slew rate */ 352 val = FIELD_PREP(TMDS181_CTRLB_SLEW_CTL, (3 - param)); 353 } 354 if (of_property_read_bool(client->dev.of_node, "ti,dvi-mode")) 355 val |= TMDS181_CTRLB_HDMI_SEL_DVI; 356 break; 357 default: 358 val = TMDS181_CTRLB_DDC_DR_SEL; 359 break; 360 } 361 362 /* Default to low-speed termination */ 363 val |= FIELD_PREP(TMDS181_CTRLB_TX_TERM_CTL, TMDS181_CTRLB_TX_TERM_150_300_OHMS); 364 365 ret = regmap_write(data->regmap, TMDS181_REG_CTRLB, val); 366 if (ret < 0) { 367 dev_err(&client->dev, "regmap_write(B) failed\n"); 368 return ret; 369 } 370 371 /* Find next bridge in chain */ 372 data->next_bridge = devm_drm_of_get_bridge(&client->dev, client->dev.of_node, 1, 0); 373 if (IS_ERR(data->next_bridge)) 374 return dev_err_probe(&client->dev, PTR_ERR(data->next_bridge), 375 "Failed to find next bridge\n"); 376 377 /* Register the bridge. */ 378 data->bridge.of_node = client->dev.of_node; 379 380 return devm_drm_bridge_add(&client->dev, &data->bridge); 381 } 382 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
