Re: [PATCH] i2c: hisi: Add I2C bus recovery support

Hi Bowen,

kernel test robot noticed the following build warnings:

[auto build test WARNING on andi-shyti/i2c/i2c-host]
[also build test WARNING on linus/master v7.2 next-20260824]
[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/Bowen-Yu/i2c-hisi-Add-I2C-bus-recovery-support/20260825-113125
base:   https://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git i2c/i2c-host
patch link:    https://lore.kernel.org/r/20260825033125.1893253-1-yubowen8%40huawei.com
patch subject: [PATCH] i2c: hisi: Add I2C bus recovery support
config: sparc64-randconfig-001-20260826 (https://download.01.org/0day-ci/archive/20260826/[email protected]/config)
compiler: sparc64-linux-gcc (GCC) 13.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260826/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All warnings (new ones prefixed by >>):

   drivers/i2c/busses/i2c-hisi.c: In function 'hisi_i2c_unprepare_recovery':
   drivers/i2c/busses/i2c-hisi.c:236:34: error: implicit declaration of function 'acpi_has_method'; did you mean 'acpi_has_watchdog'? [-Werror=implicit-function-declaration]
     236 |         if (ctlr->acpi_handle && acpi_has_method(ctlr->acpi_handle, "_RST")) {
         |                                  ^~~~~~~~~~~~~~~
         |                                  acpi_has_watchdog
   In file included from include/linux/device.h:15,
                    from include/linux/acpi.h:15,
                    from drivers/i2c/busses/i2c-hisi.c:8:
>> drivers/i2c/busses/i2c-hisi.c:241:44: warning: '%s' directive argument is null [-Wformat-overflow=]
     241 |                         dev_err(ctlr->dev, "_RST method failed: %s\n",
         |                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/dev_printk.h:110:30: note: in definition of macro 'dev_printk_index_wrap'
     110 |                 _p_func(dev, fmt, ##__VA_ARGS__);                       \
         |                              ^~~
   include/linux/dev_printk.h:154:56: note: in expansion of macro 'dev_fmt'
     154 |         dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
         |                                                        ^~~~~~~
   drivers/i2c/busses/i2c-hisi.c:241:25: note: in expansion of macro 'dev_err'
     241 |                         dev_err(ctlr->dev, "_RST method failed: %s\n",
         |                         ^~~~~~~
   drivers/i2c/busses/i2c-hisi.c:241:65: note: format string is defined here
     241 |                         dev_err(ctlr->dev, "_RST method failed: %s\n",
         |                                                                 ^~
   cc1: some warnings being treated as errors


vim +241 drivers/i2c/busses/i2c-hisi.c

   221	
   222	static void hisi_i2c_unprepare_recovery(struct i2c_adapter *adap)
   223	{
   224		struct hisi_i2c_controller *ctlr = i2c_get_adapdata(adap);
   225		u32 reg;
   226	
   227		reg = readl(ctlr->sctrl_addr);
   228		reg &= ~(HISI_I2C_CTRL_SCL_CFG_EN | HISI_I2C_CTRL_DAT_CFG_EN);
   229		writel(reg, ctlr->sctrl_addr);
   230	
   231		/*
   232		 * Invokes the specific ACPI method "_RST" for trigger a soft
   233		 * reset of I2C controller in order to help on I2C controller recover from
   234		 * the abnormal state after bus recovery process.
   235		 */
   236		if (ctlr->acpi_handle && acpi_has_method(ctlr->acpi_handle, "_RST")) {
   237			acpi_status status;
   238	
   239			status = acpi_evaluate_object(ctlr->acpi_handle, "_RST", NULL, NULL);
   240			if (ACPI_FAILURE(status))
 > 241				dev_err(ctlr->dev, "_RST method failed: %s\n",
   242					acpi_format_exception(status));
   243		}
   244	
   245		hisi_i2c_configure_bus(ctlr);
   246	}
   247	

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