Re: [PATCH v16 2/3] i2c: aspeed: support AST2600 i2c new register mode driver

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

Hi Ryan,

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 v6.14-rc4 next-20250227]
[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/Ryan-Chen/dt-bindings-i2c-aspeed-support-for-AST2600-i2cv2/20250224-140221
base:   https://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git i2c/i2c-host
patch link:    https://lore.kernel.org/r/20250224055936.1804279-3-ryan_chen%40aspeedtech.com
patch subject: [PATCH v16 2/3] i2c: aspeed: support AST2600 i2c new register mode driver
config: mips-allyesconfig (https://download.01.org/0day-ci/archive/20250228/202502280902.U0gLDhve-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250228/202502280902.U0gLDhve-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/202502280902.U0gLDhve-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/i2c/busses/i2c-ast2600.c: In function 'ast2600_i2c_recover_bus':
>> drivers/i2c/busses/i2c-ast2600.c:345:32: warning: unsigned conversion from 'int' to 'u8' {aka 'unsigned char'} changes value from '-145' to '111' [-Woverflow]
     345 |                         return -ETIMEDOUT;
         |                                ^


vim +345 drivers/i2c/busses/i2c-ast2600.c

   315	
   316	static u8 ast2600_i2c_recover_bus(struct ast2600_i2c_bus *i2c_bus)
   317	{
   318		u32 state = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
   319		int ret = 0;
   320		u32 ctrl;
   321		int r;
   322	
   323		dev_dbg(i2c_bus->dev, "%d-bus recovery bus [%x]\n", i2c_bus->adap.nr, state);
   324	
   325		ctrl = readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
   326	
   327		/* Disable controller */
   328		writel(ctrl & ~(AST2600_I2CC_MASTER_EN | AST2600_I2CC_SLAVE_EN),
   329		       i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
   330	
   331		writel(readl(i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL) | AST2600_I2CC_MASTER_EN,
   332		       i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
   333	
   334		reinit_completion(&i2c_bus->cmd_complete);
   335		i2c_bus->cmd_err = 0;
   336	
   337		/* Check 0x14's SDA and SCL status */
   338		state = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
   339		if (!(state & AST2600_I2CC_SDA_LINE_STS) && (state & AST2600_I2CC_SCL_LINE_STS)) {
   340			writel(AST2600_I2CM_RECOVER_CMD_EN, i2c_bus->reg_base + AST2600_I2CM_CMD_STS);
   341			r = wait_for_completion_timeout(&i2c_bus->cmd_complete, i2c_bus->adap.timeout);
   342			if (r == 0) {
   343				dev_dbg(i2c_bus->dev, "recovery timed out\n");
   344				writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
 > 345				return -ETIMEDOUT;
   346			} else if (i2c_bus->cmd_err) {
   347				dev_dbg(i2c_bus->dev, "recovery error\n");
   348				ret = -EPROTO;
   349			}
   350		}
   351	
   352		/* Recovery done */
   353		state = readl(i2c_bus->reg_base + AST2600_I2CC_STS_AND_BUFF);
   354		if (state & AST2600_I2CC_BUS_BUSY_STS) {
   355			dev_dbg(i2c_bus->dev, "Can't recover bus [%x]\n", state);
   356			ret = -EPROTO;
   357		}
   358	
   359		/* restore original controller setting */
   360		writel(ctrl, i2c_bus->reg_base + AST2600_I2CC_FUN_CTRL);
   361		return ret;
   362	}
   363	

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