[PATCH v2] PCI: mediatek: Fix sparse warning caused to virt_to_phys() prototype change

[kernel test robot]

Hi Stanislav,

kernel test robot noticed the following build errors:

[auto build test ERROR on pci/next]
[also build test ERROR on pci/for-linus linus/master v6.7-rc2 next-20231122]
[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/Stanislav-Kinsburskii/PCI-mediatek-Fix-sparse-warning-caused-to-virt_to_phys-prototype-change/20231121-080253
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/170052491316.21557.13173111699965824301.stgit%40skinsburskii.
patch subject: [PATCH v2] PCI: mediatek: Fix sparse warning caused to virt_to_phys() prototype change
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20231122/202311221830.SR5dv3X7-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231122/202311221830.SR5dv3X7-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311221830.SR5dv3X7-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/pci/controller/pcie-mediatek.c:400:22: error: passing 'const void *' to parameter of type 'volatile void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           addr = virt_to_phys((__force const void *)port->base + PCIE_MSI_VECTOR);
                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/io.h:128:55: note: passing argument to parameter 'address' here
   static inline phys_addr_t virt_to_phys(volatile void *address)
                                                         ^
   drivers/pci/controller/pcie-mediatek.c:523:26: error: passing 'const void *' to parameter of type 'volatile void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
           msg_addr = virt_to_phys((__force const void *)port->base + PCIE_MSI_VECTOR);
                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/io.h:128:55: note: passing argument to parameter 'address' here
   static inline phys_addr_t virt_to_phys(volatile void *address)
                                                         ^
   2 errors generated.


vim +400 drivers/pci/controller/pcie-mediatek.c

   393	
   394	static void mtk_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
   395	{
   396		struct mtk_pcie_port *port = irq_data_get_irq_chip_data(data);
   397		phys_addr_t addr;
   398	
   399		/* MT2712/MT7622 only support 32-bit MSI addresses */
 > 400		addr = virt_to_phys((__force const void *)port->base + PCIE_MSI_VECTOR);
   401		msg->address_hi = 0;
   402		msg->address_lo = lower_32_bits(addr);
   403	
   404		msg->data = data->hwirq;
   405	
   406		dev_dbg(port->pcie->dev, "msi#%d address_hi %#x address_lo %#x\n",
   407			(int)data->hwirq, msg->address_hi, msg->address_lo);
   408	}
   409	

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