[PATCH 2/2] mtd: nand: realtek-ecc: Add Realtek external ECC engine support

[kernel test robot]

Hi Markus,

kernel test robot noticed the following build errors:

[auto build test ERROR on mtd/nand/next]
[also build test ERROR on linus/master v6.17-rc2 next-20250818]
[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/Markus-Stockhausen/dt-bindings-mtd-Add-realtek-rtl9301-ecc/20250818-173253
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next
patch link:    https://lore.kernel.org/r/20250818092725.1977105-3-markus.stockhausen%40gmx.de
patch subject: [PATCH 2/2] mtd: nand: realtek-ecc: Add Realtek external ECC engine support
config: openrisc-allyesconfig (https://download.01.org/0day-ci/archive/20250819/202508191251.z4mFuzA6-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250819/202508191251.z4mFuzA6-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202508191251.z4mFuzA6-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/mtd/nand/ecc-realtek.c: In function 'rtl_ecc_wait_for_engine':
>> drivers/mtd/nand/ecc-realtek.c:165:19: error: implicit declaration of function 'FIELD_GET' [-Wimplicit-function-declaration]
     165 |         all_one = FIELD_GET(RTL_ECC_ALL_ONE, status);
         |                   ^~~~~~~~~


vim +/FIELD_GET +165 drivers/mtd/nand/ecc-realtek.c

   143	
   144	static void rtl_ecc_wait_for_engine(struct rtl_ecc_ctx *ctx)
   145	{
   146		struct rtl_ecc_engine *rtlc = ctx->rtlc;
   147		int ret, status;
   148		bool all_one;
   149	
   150		/*
   151		 * The ECC engine needs 6-8 us to encode/decode a BCH6 syndrome for 512 bytes of data
   152		 * and 6 tag bytes. In case the NAND area has been erased and all data and oob is
   153		 * set to 0xff, decoding takes 30us (reason unknown). Although the engine can trigger
   154		 * interrupts when finished, use active polling for now. 12 us maximum wait time has
   155		 * proven to be a good tradeoff between performance and overhead.
   156		 */
   157	
   158		ret = regmap_read_poll_timeout(rtlc->regmap, RTL_ECC_STATUS, status,
   159					       !(status & RTL_ECC_OP_STATUS), 12, 600);
   160		if (ret) {
   161			ctx->rc_status = ret;
   162			return;
   163		}
   164	
 > 165		all_one = FIELD_GET(RTL_ECC_ALL_ONE, status);
   166		ctx->rc_status = FIELD_GET(RTL_ECC_RESULT, status);
   167		ctx->rc_bitflips = FIELD_GET(RTL_ECC_CORR_COUNT, status);
   168	
   169		/* For erased blocks (all bits one) error status can be ignored */
   170		if (ctx->rc_status && all_one)
   171			ctx->rc_status = 0;
   172	}
   173	

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