Re: [PATCH 2/2] drivers: mmc: sdhci_am654: Add the quirk to set TESTCD bit

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

Hi Aswath,

I love your patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master ulf-hansson-mmc-mirror/next v5.18-rc3 next-20220414]
[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/Aswath-Govindraju/MMC-Add-quirk-to-set-the-TESTCD-bit/20220418-182325
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: riscv-randconfig-r016-20220418 (https://download.01.org/0day-ci/archive/20220418/202204182202.yPPV6YZI-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 429cbac0390654f90bba18a41799464adf31a5ec)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/a7d917691f55e240b1ab0abf36b0b39d1194a323
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Aswath-Govindraju/MMC-Add-quirk-to-set-the-TESTCD-bit/20220418-182325
        git checkout a7d917691f55e240b1ab0abf36b0b39d1194a323
        # 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=riscv SHELL=/bin/bash drivers/mmc/host/

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 >>):

   In file included from drivers/mmc/host/sdhci_am654.c:9:
   In file included from include/linux/iopoll.h:14:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/mmc/host/sdhci_am654.c:9:
   In file included from include/linux/iopoll.h:14:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/mmc/host/sdhci_am654.c:9:
   In file included from include/linux/iopoll.h:14:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
                                                     ~~~~~~~~~~ ^
>> drivers/mmc/host/sdhci_am654.c:375:6: warning: no previous prototype for function 'sdhci_am654_reset' [-Wmissing-prototypes]
   void sdhci_am654_reset(struct sdhci_host *host, u8 mask)
        ^
   drivers/mmc/host/sdhci_am654.c:375:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void sdhci_am654_reset(struct sdhci_host *host, u8 mask)
   ^
   static 
   8 warnings generated.


vim +/sdhci_am654_reset +375 drivers/mmc/host/sdhci_am654.c

   374	
 > 375	void sdhci_am654_reset(struct sdhci_host *host, u8 mask)
   376	{
   377		u8 ctrl;
   378		struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
   379		struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
   380	
   381		sdhci_reset(host, mask);
   382	
   383		if (sdhci_am654->quirks & SDHCI_AM654_QUIRK_FORCE_CDTEST) {
   384			ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
   385			ctrl |= SDHCI_CTRL_CDTEST_INS | SDHCI_CTRL_CDTEST_EN;
   386			sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
   387		}
   388	}
   389	

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