RE: [PATCH] i2c: designware: fix master is holding SCL low while ENABLE bit is disabled

["Liu Kimriver/刘金河" <kimriver.liu@siengine.com>]

HI，robot,
 Today I will resend a version v7 patch([PATCH V7] i2c: designware: fix master is holding SCL low while ENABLE bit is disabled)
 based on the latest Linux master branch to resolve compile errors.

-------------
Best Regards,
Kimriver Liu

-----Original Message-----
From: kernel test robot <lkp@intel.com> 
Sent: 2024年9月8日 21:32
To: Liu Kimriver/刘金河 <kimriver.liu@siengine.com>; jarkko.nikula@linux.intel.com
Cc: oe-kbuild-all@lists.linux.dev; andriy.shevchenko@linux.intel.com; mika.westerberg@linux.intel.com; jsd@semihalf.com; andi.shyti@kernel.org; linux-i2c@vger.kernel.org; linux-kernel@vger.kernel.org; Liu Kimriver/刘金河 <kimriver.liu@siengine.com>
Subject: Re: [PATCH] i2c: designware: fix master is holding SCL low while ENABLE bit is disabled

Hi kimriver,

kernel test robot noticed the following build errors:

[auto build test ERROR on andi-shyti/i2c/i2c-host]
[also build test ERROR on linus/master v6.11-rc6 next-20240906]
[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/kimriver-liu/i2c-designware-fix-master-is-holding-SCL-low-while-ENABLE-bit-is-disabled/20240905-154711
base:   https://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux.git i2c/i2c-host
patch link:    https://lore.kernel.org/r/20240905074211.2278-1-kimriver.liu%40siengine.com
patch subject: [PATCH] i2c: designware: fix master is holding SCL low while ENABLE bit is disabled
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20240908/202409082011.9JF6aYsk-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240908/202409082011.9JF6aYsk-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/202409082011.9JF6aYsk-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/i2c/busses/i2c-designware-common.c: In function '__i2c_dw_disable':
>> drivers/i2c/busses/i2c-designware-common.c:538:32: error: 'DW_IC_ENABLE_ENABLE' undeclared (first use in this function); did you mean 'DW_IC_ENABLE_STATUS'?
     538 |                 if (!(enable & DW_IC_ENABLE_ENABLE)) {
         |                                ^~~~~~~~~~~~~~~~~~~
         |                                DW_IC_ENABLE_STATUS
   drivers/i2c/busses/i2c-designware-common.c:538:32: note: each undeclared identifier is reported only once for each function it appears in


vim +538 drivers/i2c/busses/i2c-designware-common.c

   523	
   524	void __i2c_dw_disable(struct dw_i2c_dev *dev)
   525	{
   526		unsigned int raw_intr_stats;
   527		unsigned int enable;
   528		int timeout = 100;
   529		bool abort_needed;
   530		unsigned int status;
   531		int ret;
   532	
   533		regmap_read(dev->map, DW_IC_RAW_INTR_STAT, &raw_intr_stats);
   534		regmap_read(dev->map, DW_IC_ENABLE, &enable);
   535	
   536		abort_needed = raw_intr_stats & DW_IC_INTR_MST_ON_HOLD;
   537		if (abort_needed) {
 > 538			if (!(enable & DW_IC_ENABLE_ENABLE)) {
   539				regmap_write(dev->map, DW_IC_ENABLE, DW_IC_ENABLE_ENABLE);
   540				enable |= DW_IC_ENABLE_ENABLE;
   541	
   542				/*
   543				 * Wait two ic_clk delay when enabling the i2c to ensure ENABLE bit
   544				 * is already set by the driver (for 400KHz this is 25us)
   545				 * as described in the DesignWare I2C databook.
   546				 */
   547				fsleep(25);
   548			}
   549	
   550			regmap_write(dev->map, DW_IC_ENABLE, enable | DW_IC_ENABLE_ABORT);
   551			ret = regmap_read_poll_timeout(dev->map, DW_IC_ENABLE, enable,
   552						       !(enable & DW_IC_ENABLE_ABORT), 10,
   553						       100);
   554			if (ret)
   555				dev_err(dev->dev, "timeout while trying to abort current transfer\n");
   556		}
   557	
   558		do {
   559			__i2c_dw_disable_nowait(dev);
   560			/*
   561			 * The enable status register may be unimplemented, but
   562			 * in that case this test reads zero and exits the loop.
   563			 */
   564			regmap_read(dev->map, DW_IC_ENABLE_STATUS, &status);
   565			if ((status & 1) == 0)
   566				return;
   567	
   568			/*
   569			 * Wait 10 times the signaling period of the highest I2C
   570			 * transfer supported by the driver (for 400KHz this is
   571			 * 25us) as described in the DesignWare I2C databook.
   572			 */
   573			usleep_range(25, 250);
   574		} while (timeout--);
   575	
   576		dev_warn(dev->dev, "timeout in disabling adapter\n");
   577	}
   578	

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