Re: [PATCH 2/2] spi: omap2-mcspi: Add support for MULTI-mode

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

Hi Louis,

kernel test robot noticed the following build errors:

[auto build test ERROR on 41bccc98fb7931d63d03f326a746ac4d429c1dd3]

url:    https://github.com/intel-lab-lkp/linux/commits/Louis-Chauvet/Revert-spi-spi-omap2-mcspi-c-Toggle-CS-after-each-word/20240206-180243
base:   41bccc98fb7931d63d03f326a746ac4d429c1dd3
patch link:    https://lore.kernel.org/r/20240126-spi-omap2-mcspi-multi-mode-v1-2-d143d33f0fe0%40bootlin.com
patch subject: [PATCH 2/2] spi: omap2-mcspi: Add support for MULTI-mode
config: arm64-defconfig (https://download.01.org/0day-ci/archive/20240207/202402071719.e1p4tUge-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240207/202402071719.e1p4tUge-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/202402071719.e1p4tUge-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   drivers/spi/spi-omap2-mcspi.c: In function 'omap2_mcspi_prepare_message':
>> drivers/spi/spi-omap2-mcspi.c:1415:30: error: 'master' undeclared (first use in this function)
    1415 |         omap2_mcspi_set_mode(master);
         |                              ^~~~~~
   drivers/spi/spi-omap2-mcspi.c:1415:30: note: each undeclared identifier is reported only once for each function it appears in
>> drivers/spi/spi-omap2-mcspi.c:1388:13: warning: unused variable 'speed_hz' [-Wunused-variable]
    1388 |         u32 speed_hz;
         |             ^~~~~~~~


vim +/master +1415 drivers/spi/spi-omap2-mcspi.c

  1379	
  1380	static int omap2_mcspi_prepare_message(struct spi_controller *ctlr,
  1381					       struct spi_message *msg)
  1382	{
  1383		struct omap2_mcspi	*mcspi = spi_controller_get_devdata(ctlr);
  1384		struct omap2_mcspi_regs	*ctx = &mcspi->ctx;
  1385		struct omap2_mcspi_cs	*cs;
  1386		struct spi_transfer	*tr;
  1387		u8 bits_per_word;
> 1388		u32 speed_hz;
  1389	
  1390		/*
  1391		 * The conditions are strict, it is mandatory to check each transfer of the list to see if
  1392		 * multi-mode is applicable.
  1393		 */
  1394		mcspi->use_multi_mode = true;
  1395		list_for_each_entry(tr, &msg->transfers, transfer_list) {
  1396			if (!tr->bits_per_word)
  1397				bits_per_word = msg->spi->bits_per_word;
  1398			else
  1399				bits_per_word = tr->bits_per_word;
  1400	
  1401			/* Check if the transfer content is only one word */
  1402			if ((bits_per_word < 8 && tr->len > 1) ||
  1403			    (bits_per_word >= 8 && tr->len > bits_per_word / 8))
  1404				mcspi->use_multi_mode = false;
  1405	
  1406			/* Check if transfer asks to change the CS status after the transfer */
  1407			if (!tr->cs_change)
  1408				mcspi->use_multi_mode = false;
  1409	
  1410			/* If at least one message is not compatible, switch back to single mode */
  1411			if (!mcspi->use_multi_mode)
  1412				break;
  1413		}
  1414	
> 1415		omap2_mcspi_set_mode(master);
  1416	
  1417		/* In single mode only a single channel can have the FORCE bit enabled
  1418		 * in its chconf0 register.
  1419		 * Scan all channels and disable them except the current one.
  1420		 * A FORCE can remain from a last transfer having cs_change enabled
  1421		 *
  1422		 * In multi mode all FORCE bits must be disabled.
  1423		 */
  1424		list_for_each_entry(cs, &ctx->cs, node) {
  1425			if (msg->spi->controller_state == cs && !mcspi->use_multi_mode) {
  1426				continue;
  1427			}
  1428	
  1429			if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE)) {
  1430				cs->chconf0 &= ~OMAP2_MCSPI_CHCONF_FORCE;
  1431				writel_relaxed(cs->chconf0,
  1432						cs->base + OMAP2_MCSPI_CHCONF0);
  1433				readl_relaxed(cs->base + OMAP2_MCSPI_CHCONF0);
  1434			}
  1435		}
  1436	
  1437		return 0;
  1438	}
  1439	

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