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@intel.com>

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/tegra/rgb.c:281:2: error: implicit declaration of function 'drm_simple_encoder_init' [-Werror,-Wimplicit-function-declaration]
           drm_simple_encoder_init(drm, &output->encoder, DRM_MODE_ENCODER_LVDS);
           ^
   drivers/gpu/drm/tegra/rgb.c:281:2: 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/tegra/hdmi.c:1445:2: error: implicit declaration of function 'drm_simple_encoder_init' [-Werror,-Wimplicit-function-declaration]
           drm_simple_encoder_init(drm, &hdmi->output.encoder,
           ^
   drivers/gpu/drm/tegra/hdmi.c:1445:2: 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/tegra/dsi.c:1058:3: error: implicit declaration of function 'drm_simple_encoder_init' [-Werror,-Wimplicit-function-declaration]
                   drm_simple_encoder_init(drm, &dsi->output.encoder,
                   ^
   drivers/gpu/drm/tegra/dsi.c:1058:3: 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/tegra/sor.c:3102:2: error: implicit declaration of function 'drm_simple_encoder_init' [-Werror,-Wimplicit-function-declaration]
           drm_simple_encoder_init(drm, &sor->output.encoder, encoder);
           ^
   drivers/gpu/drm/tegra/sor.c:3102:2: 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 +281 drivers/gpu/drm/tegra/rgb.c

   266	
   267	int tegra_dc_rgb_init(struct drm_device *drm, struct tegra_dc *dc)
   268	{
   269		struct tegra_output *output = dc->rgb;
   270		int err;
   271	
   272		if (!dc->rgb)
   273			return -ENODEV;
   274	
   275		drm_connector_init(drm, &output->connector, &tegra_rgb_connector_funcs,
   276				   DRM_MODE_CONNECTOR_LVDS);
   277		drm_connector_helper_add(&output->connector,
   278					 &tegra_rgb_connector_helper_funcs);
   279		output->connector.dpms = DRM_MODE_DPMS_OFF;
   280	
 > 281		drm_simple_encoder_init(drm, &output->encoder, DRM_MODE_ENCODER_LVDS);
   282		drm_encoder_helper_add(&output->encoder,
   283				       &tegra_rgb_encoder_helper_funcs);
   284	
   285		drm_connector_attach_encoder(&output->connector,
   286						  &output->encoder);
   287		drm_connector_register(&output->connector);
   288	
   289		err = tegra_output_init(drm, output);
   290		if (err < 0) {
   291			dev_err(output->dev, "failed to initialize output: %d\n", err);
   292			return err;
   293		}
   294	
   295		/*
   296		 * Other outputs can be attached to either display controller. The RGB
   297		 * outputs are an exception and work only with their parent display
   298		 * controller.
   299		 */
   300		output->encoder.possible_crtcs = drm_crtc_mask(&dc->base);
   301	
   302		return 0;
   303	}
   304	

---
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