Re: [PATCH v14 5/6] drm/loongson: add drm driver for loongson display controller

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

Hi Sui,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm/drm-next]
[also build test ERROR on robh/for-next linus/master v5.17 next-20220401]
[cannot apply to mripard/sunxi/for-next]
[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/Sui-Jingfeng/drm-loongson-add-drm-driver-for-loongson-display-controller/20220402-003557
base:   git://anongit.freedesktop.org/drm/drm drm-next
config: sparc-randconfig-r012-20220402 (https://download.01.org/0day-ci/archive/20220402/202204021321.5sYDUPbx-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 11.2.0
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
        # https://github.com/intel-lab-lkp/linux/commit/b52cc469ed1a99a0803faef886f81607b1f7f5c0
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Sui-Jingfeng/drm-loongson-add-drm-driver-for-loongson-display-controller/20220402-003557
        git checkout b52cc469ed1a99a0803faef886f81607b1f7f5c0
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sparc SHELL=/bin/bash drivers/gpu/drm/loongson/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   drivers/gpu/drm/loongson/lsdc_i2c.c: In function 'ls7a_gpio_i2c_set':
>> drivers/gpu/drm/loongson/lsdc_i2c.c:37:23: error: implicit declaration of function 'readb' [-Werror=implicit-function-declaration]
      37 |                 val = readb(li2c->dir_reg);
         |                       ^~~~~
>> drivers/gpu/drm/loongson/lsdc_i2c.c:39:17: error: implicit declaration of function 'writeb' [-Werror=implicit-function-declaration]
      39 |                 writeb(val, li2c->dir_reg);
         |                 ^~~~~~
   cc1: some warnings being treated as errors


vim +/readb +37 drivers/gpu/drm/loongson/lsdc_i2c.c

    19	
    20	/*
    21	 * ls7a_gpio_i2c_set - set the state of a gpio pin, either high or low.
    22	 * @mask: gpio pin mask indicate which pin to set
    23	 */
    24	static void ls7a_gpio_i2c_set(struct lsdc_i2c * const li2c, int mask, int state)
    25	{
    26		unsigned long flags;
    27		u8 val;
    28	
    29		spin_lock_irqsave(&li2c->reglock, flags);
    30	
    31		if (state) {
    32			/*
    33			 * The high state is achieved by setting the direction as
    34			 * input, because the GPIO is open drained with external
    35			 * pull up resistance.
    36			 */
  > 37			val = readb(li2c->dir_reg);
    38			val |= mask;
  > 39			writeb(val, li2c->dir_reg);
    40		} else {
    41			/* First, set this pin as output */
    42			val = readb(li2c->dir_reg);
    43			val &= ~mask;
    44			writeb(val, li2c->dir_reg);
    45	
    46			/* Then, set the state to it */
    47			val = readb(li2c->dat_reg);
    48			val &= ~mask;
    49			writeb(val, li2c->dat_reg);
    50		}
    51	
    52		spin_unlock_irqrestore(&li2c->reglock, flags);
    53	}
    54	

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