[xilinx-xlnx:xlnx_rebase_v6.6_LTS_2024.1_update 383/1001] drivers/gpu/drm/xlnx/zynqmp_dp.c:361:2: error: call to undeclared function 'writel'; ISO C99 and later do not support implicit function declarations

[xilinx-xlnx:xlnx_rebase_v6.6_LTS_2024.1_update 383/1001] drivers/gpu/drm/xlnx/zynqmp_dp.c:361:2: error: call to undeclared function 'writel'; ISO C99 and later do not support implicit function declarations

[kernel test robot]

Hi Michal,

FYI, the error/warning still remains.

tree:   https://github.com/Xilinx/linux-xlnx xlnx_rebase_v6.6_LTS_2024.1_update
head:   5365c13a86998da06d845c918f849b30b8735538
commit: bdf045814d4629c0ab369b168755b12635532dc3 [383/1001] drm: xlnx: Update DP subsystem with downstream version
config: s390-allmodconfig (https://download.01.org/0day-ci/archive/20240927/202409272111.QHpMu8rt-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/20240927/202409272111.QHpMu8rt-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/202409272111.QHpMu8rt-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/gpu/drm/xlnx/zynqmp_dp.c:12:
   In file included from include/drm/drm_atomic_helper.h:31:
   In file included from include/drm/drm_crtc.h:32:
   In file included from include/drm/drm_modes.h:30:
   In file included from include/linux/hdmi.h:28:
   In file included from include/linux/device.h:32:
   In file included from include/linux/device/driver.h:21:
   In file included from include/linux/module.h:19:
   In file included from include/linux/elf.h:6:
   In file included from arch/s390/include/asm/elf.h:173:
   In file included from arch/s390/include/asm/mmu_context.h:11:
   In file included from arch/s390/include/asm/pgalloc.h:18:
   In file included from include/linux/mm.h:2168:
   include/linux/vmstat.h:508:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     508 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     509 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:515:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     515 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     516 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   include/linux/vmstat.h:527:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     527 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     528 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:536:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     536 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     537 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/xlnx/zynqmp_dp.c:361:2: error: call to undeclared function 'writel'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     361 |         writel(val, base + offset);
         |         ^
>> drivers/gpu/drm/xlnx/zynqmp_dp.c:366:9: error: call to undeclared function 'readl'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     366 |         return readl(base + offset);
         |                ^
   5 warnings and 2 errors generated.

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for DRM_PANEL_SIMPLE
   Depends on [n]: HAS_IOMEM [=y] && DRM [=m] && DRM_PANEL [=y] && OF [=y] && BACKLIGHT_CLASS_DEVICE [=m] && PM
   Selected by [m]:
   - DRM_XLNX_DSI [=m] && HAS_IOMEM [=y] && DRM_XLNX [=m]


vim +/writel +361 drivers/gpu/drm/xlnx/zynqmp_dp.c

   358	
   359	static void zynqmp_dp_write(void __iomem *base, int offset, u32 val)
   360	{
 > 361		writel(val, base + offset);
   362	}
   363	
   364	static u32 zynqmp_dp_read(void __iomem *base, int offset)
   365	{
 > 366		return readl(base + offset);
   367	}
   368	

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