Hi Thomas,

I love your patch! Yet something to improve:

[auto build test ERROR on next-20200305]
[cannot apply to rockchip/for-next shawnguo/for-next sunxi/sunxi/for-next tegra/for-next linus/master v5.6-rc4 v5.6-rc3 v5.6-rc2 v5.6-rc4]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Thomas-Zimmermann/drm-Convert-drivers-to-drm_simple_encoder_init/20200306-045931
base:    47466dcf84ee66a973ea7d2fca7e582fe9328932
config: arm64-defconfig (attached as .config)
compiler: clang version 11.0.0 (git://gitmirror/llvm_project a0cd413426479abb207381bdbab862f3dfb3ce7d)
reproduce:
        # FIXME the reproduce steps for clang is not ready yet

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/rockchip/analogix_dp-rockchip.c:309:8: error: implicit declaration of function 'drm_simple_encoder_init' [-Werror,-Wimplicit-function-declaration]
           ret = drm_simple_encoder_init(drm_dev, encoder,
                 ^
   drivers/gpu/drm/rockchip/analogix_dp-rockchip.c:309:8: note: did you mean 'drm_encoder_init'?
   include/drm/drm_encoder.h:189:5: note: 'drm_encoder_init' declared here
   int drm_encoder_init(struct drm_device *dev,
       ^
   1 error generated.
--
>> drivers/gpu/drm/rockchip/cdn-dp-core.c:1030:8: error: implicit declaration of function 'drm_simple_encoder_init' [-Werror,-Wimplicit-function-declaration]
           ret = drm_simple_encoder_init(drm_dev, encoder,
                 ^
   drivers/gpu/drm/rockchip/cdn-dp-core.c:1030:8: note: did you mean 'drm_encoder_init'?
   include/drm/drm_encoder.h:189:5: note: 'drm_encoder_init' declared here
   int drm_encoder_init(struct drm_device *dev,
       ^
   1 error generated.
--
>> drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c:546:2: error: implicit declaration of function 'drm_simple_encoder_init' [-Werror,-Wimplicit-function-declaration]
           drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
           ^
   drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c:546:2: note: did you mean 'drm_encoder_init'?
   include/drm/drm_encoder.h:189:5: note: 'drm_encoder_init' declared here
   int drm_encoder_init(struct drm_device *dev,
       ^
   1 error generated.
--
>> drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c:802:8: error: implicit declaration of function 'drm_simple_encoder_init' [-Werror,-Wimplicit-function-declaration]
           ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_DSI);
                 ^
   drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c:802:8: note: did you mean 'drm_encoder_init'?
   include/drm/drm_encoder.h:189:5: note: 'drm_encoder_init' declared here
   int drm_encoder_init(struct drm_device *dev,
       ^
   1 error generated.
--
>> drivers/gpu/drm/rockchip/inno_hdmi.c:617:2: error: implicit declaration of function 'drm_simple_encoder_init' [-Werror,-Wimplicit-function-declaration]
           drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
           ^
   drivers/gpu/drm/rockchip/inno_hdmi.c:617:2: note: did you mean 'drm_encoder_init'?
   include/drm/drm_encoder.h:189:5: note: 'drm_encoder_init' declared here
   int drm_encoder_init(struct drm_device *dev,
       ^
   1 error generated.

vim +/drm_simple_encoder_init +309 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c

   297	
   298	static int rockchip_dp_drm_create_encoder(struct rockchip_dp_device *dp)
   299	{
   300		struct drm_encoder *encoder = &dp->encoder;
   301		struct drm_device *drm_dev = dp->drm_dev;
   302		struct device *dev = dp->dev;
   303		int ret;
   304	
   305		encoder->possible_crtcs = drm_of_find_possible_crtcs(drm_dev,
   306								     dev->of_node);
   307		DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
   308	
 > 309		ret = drm_simple_encoder_init(drm_dev, encoder,
   310					      DRM_MODE_ENCODER_TMDS);
   311		if (ret) {
   312			DRM_ERROR("failed to initialize encoder with drm\n");
   313			return ret;
   314		}
   315	
   316		drm_encoder_helper_add(encoder, &rockchip_dp_encoder_helper_funcs);
   317	
   318		return 0;
   319	}
   320	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org