Re: [PATCH v6 2/2] drm/mediatek: Add blend_modes to mtk_plane_init() for different SoCs

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

Hi Jason-JH.Lin,

kernel test robot noticed the following build warnings:

[auto build test WARNING on drm/drm-next]
[also build test WARNING on linus/master next-20240927]
[cannot apply to v6.11]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jason-JH-Lin/drm-mediatek-ovl-Add-blend_modes-to-driver-data/20240926-163734
base:   git://anongit.freedesktop.org/drm/drm drm-next
patch link:    https://lore.kernel.org/r/20240926083526.24629-3-jason-jh.lin%40mediatek.com
patch subject: [PATCH v6 2/2] drm/mediatek: Add blend_modes to mtk_plane_init() for different SoCs
config: arm64-randconfig-001-20240929 (https://download.01.org/0day-ci/archive/20240929/202409290651.YLKsl39c-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 7773243d9916f98ba0ffce0c3a960e4aa9f03e81)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240929/202409290651.YLKsl39c-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409290651.YLKsl39c-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu/drm/mediatek/mtk_ethdr.c:18:
   In file included from drivers/gpu/drm/mediatek/mtk_crtc.h:9:
   In file included from include/drm/drm_crtc.h:32:
   In file included from include/drm/drm_modes.h:33:
   In file included from include/drm/drm_connector.h:32:
   In file included from include/drm/drm_util.h:36:
   In file included from include/linux/kgdb.h:19:
   In file included from include/linux/kprobes.h:28:
   In file included from include/linux/ftrace.h:13:
   In file included from include/linux/kallsyms.h:13:
   In file included from include/linux/mm.h:2232:
   include/linux/vmstat.h:517:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     517 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from drivers/gpu/drm/mediatek/mtk_ethdr.c:18:
   In file included from drivers/gpu/drm/mediatek/mtk_crtc.h:10:
   drivers/gpu/drm/mediatek/mtk_ddp_comp.h:83:2: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
      83 |         const u32 (*get_blend_modes)(struct device *dev);
         |         ^~~~~
   drivers/gpu/drm/mediatek/mtk_ddp_comp.h:271:1: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
     271 | const u32 mtk_ddp_comp_get_blend_modes(struct mtk_ddp_comp *comp)
         | ^~~~~
   In file included from drivers/gpu/drm/mediatek/mtk_ethdr.c:21:
>> drivers/gpu/drm/mediatek/mtk_ethdr.h:16:1: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
      16 | const u32 mtk_ethdr_get_blend_modes(struct device *dev);
         | ^~~~~
>> drivers/gpu/drm/mediatek/mtk_ethdr.c:148:1: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
     148 | const u32 mtk_ethdr_get_blend_modes(struct device *dev)
         | ^~~~~
   5 warnings generated.
--
   In file included from drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:7:
   In file included from include/drm/drm_of.h:8:
   In file included from include/drm/drm_bridge.h:30:
   In file included from include/drm/drm_atomic.h:31:
   In file included from include/drm/drm_crtc.h:32:
   In file included from include/drm/drm_modes.h:33:
   In file included from include/drm/drm_connector.h:32:
   In file included from include/drm/drm_util.h:36:
   In file included from include/linux/kgdb.h:19:
   In file included from include/linux/kprobes.h:28:
   In file included from include/linux/ftrace.h:13:
   In file included from include/linux/kallsyms.h:13:
   In file included from include/linux/mm.h:2232:
   include/linux/vmstat.h:517:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     517 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:20:
   drivers/gpu/drm/mediatek/mtk_ddp_comp.h:83:2: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
      83 |         const u32 (*get_blend_modes)(struct device *dev);
         |         ^~~~~
   drivers/gpu/drm/mediatek/mtk_ddp_comp.h:271:1: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
     271 | const u32 mtk_ddp_comp_get_blend_modes(struct mtk_ddp_comp *comp)
         | ^~~~~
   In file included from drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:21:
   drivers/gpu/drm/mediatek/mtk_disp_drv.h:106:1: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
     106 | const u32 mtk_ovl_get_blend_modes(struct device *dev);
         | ^~~~~
   drivers/gpu/drm/mediatek/mtk_disp_drv.h:135:1: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
     135 | const u32 mtk_ovl_adaptor_get_blend_modes(struct device *dev);
         | ^~~~~
   In file included from drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:23:
>> drivers/gpu/drm/mediatek/mtk_ethdr.h:16:1: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
      16 | const u32 mtk_ethdr_get_blend_modes(struct device *dev);
         | ^~~~~
   drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c:403:1: warning: 'const' type qualifier on return type has no effect [-Wignored-qualifiers]
     403 | const u32 mtk_ovl_adaptor_get_blend_modes(struct device *dev)
         | ^~~~~
   7 warnings generated.


vim +/const +16 drivers/gpu/drm/mediatek/mtk_ethdr.h

     8	
     9	void mtk_ethdr_start(struct device *dev);
    10	void mtk_ethdr_stop(struct device *dev);
    11	int mtk_ethdr_clk_enable(struct device *dev);
    12	void mtk_ethdr_clk_disable(struct device *dev);
    13	void mtk_ethdr_config(struct device *dev, unsigned int w,
    14			      unsigned int h, unsigned int vrefresh,
    15			      unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
  > 16	const u32 mtk_ethdr_get_blend_modes(struct device *dev);

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