Re: [PATCH v2 4/5] drm/solomon: Move device info from ssd130x-i2c to the core driver

[kernel test robot <lkp@intel.com>]

Hi Javier,

I love your patch! Perhaps something to improve:

[auto build test WARNING on drm-tip/drm-tip]
[also build test WARNING on next-20220411]
[cannot apply to drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next tegra-drm/drm/tegra/for-next linus/master linux/master v5.18-rc2]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Javier-Martinez-Canillas/drm-solomon-Add-SSD130x-OLED-displays-SPI-support/20220412-051518
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
config: x86_64-randconfig-a001-20220411 (https://download.01.org/0day-ci/archive/20220412/202204121542.aU2BiYXN-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project fe2478d44e4f7f191c43fef629ac7a23d0251e72)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/ac5a07cda8a0f8d4948e6a01d0b3bb6ce9fe7830
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Javier-Martinez-Canillas/drm-solomon-Add-SSD130x-OLED-displays-SPI-support/20220412-051518
        git checkout ac5a07cda8a0f8d4948e6a01d0b3bb6ce9fe7830
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/solomon/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/solomon/ssd130x.c:894:12: warning: cast to smaller integer type 'enum ssd130x_variants' from 'const void *' [-Wvoid-pointer-to-enum-cast]
           variant = (enum ssd130x_variants)device_get_match_data(dev);
                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.


vim +894 drivers/gpu/drm/solomon/ssd130x.c

   874	
   875	struct ssd130x_device *ssd130x_probe(struct device *dev, struct regmap *regmap)
   876	{
   877		struct ssd130x_device *ssd130x;
   878		enum ssd130x_variants variant;
   879		struct backlight_device *bl;
   880		struct drm_device *drm;
   881		int ret;
   882	
   883		ssd130x = devm_drm_dev_alloc(dev, &ssd130x_drm_driver,
   884					     struct ssd130x_device, drm);
   885		if (IS_ERR(ssd130x))
   886			return ERR_PTR(dev_err_probe(dev, PTR_ERR(ssd130x),
   887						     "Failed to allocate DRM device\n"));
   888	
   889		drm = &ssd130x->drm;
   890	
   891		ssd130x->dev = dev;
   892		ssd130x->regmap = regmap;
   893	
 > 894		variant = (enum ssd130x_variants)device_get_match_data(dev);
   895	
   896		if (variant >= NR_SSD130X_VARIANTS)
   897			return ERR_PTR(dev_err_probe(dev, -EINVAL,
   898						     "Invalid SSD130x variant\n"));
   899	
   900		ssd130x->device_info = &ssd130x_variants[variant];
   901	
   902		if (ssd130x->device_info->page_mode_only)
   903			ssd130x->page_address_mode = 1;
   904	
   905		ssd130x_parse_properties(ssd130x);
   906	
   907		ret = ssd130x_get_resources(ssd130x);
   908		if (ret)
   909			return ERR_PTR(ret);
   910	
   911		bl = devm_backlight_device_register(dev, dev_name(dev), dev, ssd130x,
   912						    &ssd130xfb_bl_ops, NULL);
   913		if (IS_ERR(bl))
   914			return ERR_PTR(dev_err_probe(dev, PTR_ERR(bl),
   915						     "Unable to register backlight device\n"));
   916	
   917		bl->props.brightness = ssd130x->contrast;
   918		bl->props.max_brightness = MAX_CONTRAST;
   919		ssd130x->bl_dev = bl;
   920	
   921		ret = ssd130x_init_modeset(ssd130x);
   922		if (ret)
   923			return ERR_PTR(ret);
   924	
   925		ret = drm_dev_register(drm, 0);
   926		if (ret)
   927			return ERR_PTR(dev_err_probe(dev, ret, "DRM device register failed\n"));
   928	
   929		drm_fbdev_generic_setup(drm, 0);
   930	
   931		return ssd130x;
   932	}
   933	EXPORT_SYMBOL_GPL(ssd130x_probe);
   934	

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