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SubjectRe: [PATCH v3 12/14] spi: mxic: patch for octal DTR mode support
Hi Mason,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on next-20200526]
[also build test WARNING on v5.7-rc7]
[cannot apply to spi/for-next xlnx/master linus/master linux/master v5.7-rc7 v5.7-rc6 v5.7-rc5]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url: https://github.com/0day-ci/linux/commits/Mason-Yang/mtd-spi-nor-add-xSPI-Octal-DTR-support/20200528-162925
base: b0523c7b1c9d0edcd6c0fe6d2cb558a9ad5c60a8
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 2d068e534f1671459e1b135852c1b3c10502e929)
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
# install x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64

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

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> drivers/spi/spi-mxic.c:302:21: warning: result of comparison of constant 256 with expression of type 'const u8' (aka 'const unsigned char') is always false [-Wtautological-constant-out-of-range-compare]
if (op->data.dtr == OP_DATA_DDR)
~~~~~~~~~~~~ ^ ~~~~~~~~~~~
1 warning generated.

vim +302 drivers/spi/spi-mxic.c

282
283 static u32 mxic_spi_mem_prep_op_cfg(const struct spi_mem_op *op)
284 {
285 u32 cfg = OP_CMD_BYTES(op->cmd.nbytes) |
286 OP_CMD_BUSW(fls(op->cmd.buswidth) - 1) |
287 (op->cmd.dtr ? OP_CMD_DDR : 0);
288
289 if (op->addr.nbytes)
290 cfg |= OP_ADDR_BYTES(op->addr.nbytes) |
291 OP_ADDR_BUSW(fls(op->addr.buswidth) - 1) |
292 (op->addr.dtr ? OP_ADDR_DDR : 0);
293
294 if (op->dummy.nbytes)
295 cfg |= OP_DUMMY_CYC(op->dummy.nbytes);
296
297 if (op->data.nbytes) {
298 cfg |= OP_DATA_BUSW(fls(op->data.buswidth) - 1) |
299 (op->data.dtr ? OP_DATA_DDR : 0);
300 if (op->data.dir == SPI_MEM_DATA_IN) {
301 cfg |= OP_READ;
> 302 if (op->data.dtr == OP_DATA_DDR)
303 cfg |= OP_DQS_EN;
304 }
305 }
306
307 return cfg;
308 }
309

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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