linux-kernel - drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:415:10: warning: cast to smaller integer type 'enum mtk_ovl_adaptor_comp

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Date:   Thu, 4 May 2023 21:01:35 +0800
From:   kernel test robot <lkp@...el.com>
To:     "Nancy.Lin" <nancy.lin@...iatek.com>
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:415:10: warning:
 cast to smaller integer type 'enum mtk_ovl_adaptor_comp_type' from 'const
 void *'

Hi Nancy.Lin,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1a5304fecee523060f26e2778d9d8e33c0562df3
commit: 453c3364632a1f305db7d425dc9f8d6711cd3491 drm/mediatek: Add ovl_adaptor support for MT8195
date:   6 weeks ago
config: arm64-randconfig-r004-20230504 (https://download.01.org/0day-ci/archive/20230504/202305042054.ZtWME9OU-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project b1465cd49efcbc114a75220b153f5a055ce7911f)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=453c3364632a1f305db7d425dc9f8d6711cd3491
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 453c3364632a1f305db7d425dc9f8d6711cd3491
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/gpu/drm/mediatek/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305042054.ZtWME9OU-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:415:10: warning: cast to smaller integer type 'enum mtk_ovl_adaptor_comp_type' from 'const void *' [-Wvoid-pointer-to-enum-cast]
                   type = (enum mtk_ovl_adaptor_comp_type)of_id->data;
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.


vim +415 drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c

   391	
   392	static int ovl_adaptor_comp_init(struct device *dev, struct component_match **match)
   393	{
   394		struct mtk_disp_ovl_adaptor *priv = dev_get_drvdata(dev);
   395		struct device_node *node, *parent;
   396		struct platform_device *comp_pdev;
   397	
   398		parent = dev->parent->parent->of_node->parent;
   399	
   400		for_each_child_of_node(parent, node) {
   401			const struct of_device_id *of_id;
   402			enum mtk_ovl_adaptor_comp_type type;
   403			int id;
   404	
   405			of_id = of_match_node(mtk_ovl_adaptor_comp_dt_ids, node);
   406			if (!of_id)
   407				continue;
   408	
   409			if (!of_device_is_available(node)) {
   410				dev_dbg(dev, "Skipping disabled component %pOF\n",
   411					node);
   412				continue;
   413			}
   414	
 > 415			type = (enum mtk_ovl_adaptor_comp_type)of_id->data;
   416			id = ovl_adaptor_comp_get_id(dev, node, type);
   417			if (id < 0) {
   418				dev_warn(dev, "Skipping unknown component %pOF\n",
   419					 node);
   420				continue;
   421			}
   422	
   423			comp_pdev = of_find_device_by_node(node);
   424			if (!comp_pdev)
   425				return -EPROBE_DEFER;
   426	
   427			priv->ovl_adaptor_comp[id] = &comp_pdev->dev;
   428	
   429			drm_of_component_match_add(dev, match, compare_of, node);
   430			dev_dbg(dev, "Adding component match for %pOF\n", node);
   431		}
   432	
   433		if (!*match) {
   434			dev_err(dev, "No match device for ovl_adaptor\n");
   435			return -ENODEV;
   436		}
   437	
   438		return 0;
   439	}
   440	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests