Hi Maxime, I love your patch! Yet something to improve: [auto build test ERROR on ] url: https://github.com/0day-ci/linux/commits/Maxime-Ripard/drm-sun4i-Support-the-Display-Engine-frontend/20171216-122702 base: config: arm-sunxi_defconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=arm Note: the linux-review/Maxime-Ripard/drm-sun4i-Support-the-Display-Engine-frontend/20171216-122702 HEAD c38c4ce4b14c4c68a9fde0cc35ead5b1c894776b builds fine. It only hurts bisectibility. All error/warnings (new ones prefixed by >>): drivers/gpu/drm/sun4i/sun4i_backend.c: In function 'sun4i_backend_bind': >> drivers/gpu/drm/sun4i/sun4i_backend.c:370:22: error: implicit declaration of function 'sun4i_backend_find_frontend'; did you mean 'sun4i_backend_bind'? [-Werror=implicit-function-declaration] backend->frontend = sun4i_backend_find_frontend(drv, dev->of_node); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ sun4i_backend_bind >> drivers/gpu/drm/sun4i/sun4i_backend.c:370:20: warning: assignment makes pointer from integer without a cast [-Wint-conversion] backend->frontend = sun4i_backend_find_frontend(drv, dev->of_node); ^ cc1: some warnings being treated as errors vim +370 drivers/gpu/drm/sun4i/sun4i_backend.c 346 347 static int sun4i_backend_bind(struct device *dev, struct device *master, 348 void *data) 349 { 350 struct platform_device *pdev = to_platform_device(dev); 351 struct drm_device *drm = data; 352 struct sun4i_drv *drv = drm->dev_private; 353 struct sun4i_backend *backend; 354 const struct sun4i_backend_quirks *quirks; 355 struct resource *res; 356 void __iomem *regs; 357 int i, ret; 358 359 backend = devm_kzalloc(dev, sizeof(*backend), GFP_KERNEL); 360 if (!backend) 361 return -ENOMEM; 362 dev_set_drvdata(dev, backend); 363 364 backend->engine.node = dev->of_node; 365 backend->engine.ops = &sun4i_backend_engine_ops; 366 backend->engine.id = sun4i_backend_of_get_id(dev->of_node); 367 if (backend->engine.id < 0) 368 return backend->engine.id; 369 > 370 backend->frontend = sun4i_backend_find_frontend(drv, dev->of_node); 371 if (IS_ERR(backend->frontend)) { 372 dev_err(dev, "Couldn't find matching frontend, frontend features disabled\n"); 373 } 374 375 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 376 regs = devm_ioremap_resource(dev, res); 377 if (IS_ERR(regs)) 378 return PTR_ERR(regs); 379 380 backend->reset = devm_reset_control_get(dev, NULL); 381 if (IS_ERR(backend->reset)) { 382 dev_err(dev, "Couldn't get our reset line\n"); 383 return PTR_ERR(backend->reset); 384 } 385 386 ret = reset_control_deassert(backend->reset); 387 if (ret) { 388 dev_err(dev, "Couldn't deassert our reset line\n"); 389 return ret; 390 } 391 392 backend->bus_clk = devm_clk_get(dev, "ahb"); 393 if (IS_ERR(backend->bus_clk)) { 394 dev_err(dev, "Couldn't get the backend bus clock\n"); 395 ret = PTR_ERR(backend->bus_clk); 396 goto err_assert_reset; 397 } 398 clk_prepare_enable(backend->bus_clk); 399 400 backend->mod_clk = devm_clk_get(dev, "mod"); 401 if (IS_ERR(backend->mod_clk)) { 402 dev_err(dev, "Couldn't get the backend module clock\n"); 403 ret = PTR_ERR(backend->mod_clk); 404 goto err_disable_bus_clk; 405 } 406 clk_prepare_enable(backend->mod_clk); 407 408 backend->ram_clk = devm_clk_get(dev, "ram"); 409 if (IS_ERR(backend->ram_clk)) { 410 dev_err(dev, "Couldn't get the backend RAM clock\n"); 411 ret = PTR_ERR(backend->ram_clk); 412 goto err_disable_mod_clk; 413 } 414 clk_prepare_enable(backend->ram_clk); 415 416 if (of_device_is_compatible(dev->of_node, 417 "allwinner,sun8i-a33-display-backend")) { 418 ret = sun4i_backend_init_sat(dev); 419 if (ret) { 420 dev_err(dev, "Couldn't init SAT resources\n"); 421 goto err_disable_ram_clk; 422 } 423 } 424 425 backend->engine.regs = devm_regmap_init_mmio(dev, regs, 426 &sun4i_backend_regmap_config); 427 if (IS_ERR(backend->engine.regs)) { 428 dev_err(dev, "Couldn't create the backend regmap\n"); 429 return PTR_ERR(backend->engine.regs); 430 } 431 432 list_add_tail(&backend->engine.list, &drv->engine_list); 433 434 /* 435 * Many of the backend's layer configuration registers have 436 * undefined default values. This poses a risk as we use 437 * regmap_update_bits in some places, and don't overwrite 438 * the whole register. 439 * 440 * Clear the registers here to have something predictable. 441 */ 442 for (i = 0x800; i < 0x1000; i += 4) 443 regmap_write(backend->engine.regs, i, 0); 444 445 /* Disable registers autoloading */ 446 regmap_write(backend->engine.regs, SUN4I_BACKEND_REGBUFFCTL_REG, 447 SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS); 448 449 /* Enable the backend */ 450 regmap_write(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, 451 SUN4I_BACKEND_MODCTL_DEBE_EN | 452 SUN4I_BACKEND_MODCTL_START_CTL); 453 454 /* Set output selection if needed */ 455 quirks = of_device_get_match_data(dev); 456 if (quirks->needs_output_muxing) { 457 /* 458 * We assume there is no dynamic muxing of backends 459 * and TCONs, so we select the backend with same ID. 460 * 461 * While dynamic selection might be interesting, since 462 * the CRTC is tied to the TCON, while the layers are 463 * tied to the backends, this means, we will need to 464 * switch between groups of layers. There might not be 465 * a way to represent this constraint in DRM. 466 */ 467 regmap_update_bits(backend->engine.regs, 468 SUN4I_BACKEND_MODCTL_REG, 469 SUN4I_BACKEND_MODCTL_OUT_SEL, 470 (backend->engine.id 471 ? SUN4I_BACKEND_MODCTL_OUT_LCD1 472 : SUN4I_BACKEND_MODCTL_OUT_LCD0)); 473 } 474 475 return 0; 476 477 err_disable_ram_clk: 478 clk_disable_unprepare(backend->ram_clk); 479 err_disable_mod_clk: 480 clk_disable_unprepare(backend->mod_clk); 481 err_disable_bus_clk: 482 clk_disable_unprepare(backend->bus_clk); 483 err_assert_reset: 484 reset_control_assert(backend->reset); 485 return ret; 486 } 487 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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