Hi Li-hao,

I love your patch! Perhaps something to improve:

[auto build test WARNING on pza/reset/next]
[also build test WARNING on robh/for-next ulf-hansson-mmc-mirror/next linus/master v5.16-rc7 next-20211224]
[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]

url:    https://github.com/0day-ci/linux/commits/Li-hao-Kuo/Add-SD-SDIO-control-driver-for-Sunplus-SP7021-SoC/20211224-140704
base:   https://git.pengutronix.de/git/pza/linux reset/next
config: parisc-randconfig-c004-20211228 (https://download.01.org/0day-ci/archive/20211229/202112290015.gY5j9jw5-lkp(a)intel.com/config)
compiler: hppa-linux-gcc (GCC) 11.2.0
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
        # https://github.com/0day-ci/linux/commit/16ea62b9e9561c6054da687edb9f8603d1e7a158
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Li-hao-Kuo/Add-SD-SDIO-control-driver-for-Sunplus-SP7021-SoC/20211224-140704
        git checkout 16ea62b9e9561c6054da687edb9f8603d1e7a158
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=parisc SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

   drivers/mmc/host/sunplus_sd2.c: In function 'spsdc_set_bus_timing':
   drivers/mmc/host/sunplus_sd2.c:280:15: warning: variable 'timing_name' set but not used [-Wunused-but-set-variable]
     280 |         char *timing_name;
         |               ^~~~~~~~~~~
   drivers/mmc/host/sunplus_sd2.c: In function 'spsdc_set_bus_width':
   drivers/mmc/host/sunplus_sd2.c:300:13: warning: variable 'bus_width' set but not used [-Wunused-but-set-variable]
     300 |         int bus_width;
         |             ^~~~~~~~~
   drivers/mmc/host/sunplus_sd2.c: At top level:
   drivers/mmc/host/sunplus_sd2.c:743:13: warning: no previous prototype for 'spsdc_irq' [-Wmissing-prototypes]
     743 | irqreturn_t spsdc_irq(int irq, void *dev_id)
         |             ^~~~~~~~~
   drivers/mmc/host/sunplus_sd2.c:849:5: warning: no previous prototype for 'spsdc_get_cd' [-Wmissing-prototypes]
     849 | int spsdc_get_cd(struct mmc_host *mmc)
         |     ^~~~~~~~~~~~
   drivers/mmc/host/sunplus_sd2.c: In function 'spsdc_request':
>> drivers/mmc/host/sunplus_sd2.c:775:9: warning: ignoring return value of 'mutex_lock_interruptible' declared with attribute 'warn_unused_result' [-Wunused-result]
     775 |         mutex_lock_interruptible(&host->mrq_lock);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +775 drivers/mmc/host/sunplus_sd2.c

   767	
   768	static void spsdc_request(struct mmc_host *mmc, struct mmc_request *mrq)
   769	{
   770		struct spsdc_host *host = mmc_priv(mmc);
   771		struct mmc_command *cmd;
   772		struct mmc_data *data;
   773		int bus_width = mmc->ios.bus_width;
   774	
 > 775		mutex_lock_interruptible(&host->mrq_lock);
   776		host->mrq = mrq;
   777		data = mrq->data;
   778		cmd = mrq->cmd;
   779	
   780		if (cmd->opcode == SD_IO_RW_EXTENDED && bus_width ==
   781				MMC_BUS_WIDTH_4 && data->blocks * data->blksz <= 4) {
   782			if (__switch_sdio_bus_width(host, MMC_BUS_WIDTH_1)) {
   783				cmd->error = -1;
   784				host->mrq = NULL;
   785				mutex_unlock(&host->mrq_lock);
   786				mmc_request_done(host->mmc, mrq);
   787				return;
   788			}
   789			host->restore_4bit_sdio_bus = 1;
   790		}
   791	
   792		spsdc_prepare_cmd(host, cmd);
   793		/* we need manually read response R2. */
   794		if (unlikely(cmd->flags & MMC_RSP_136)) {
   795			spsdc_trigger_transaction(host);
   796			spsdc_get_rsp(host, cmd);
   797			spsdc_wait_finish(host);
   798			spsdc_check_error(host, mrq);
   799			host->mrq = NULL;
   800			mutex_unlock(&host->mrq_lock);
   801			mmc_request_done(host->mmc, mrq);
   802		} else {
   803			if (data)
   804				spsdc_prepare_data(host, data);
   805	
   806			if ((host->dmapio_mode && data) ==  SPSDC_PIO_MODE) {
   807				u32 value;
   808				/* pio data transfer do not use interrupt */
   809				value = readl(host->base + SPSD2_SD_INT_REG);
   810				value &= ~SPSDC_SDINT_SDCMPEN;
   811				writel(value, host->base + SPSD2_SD_INT_REG);
   812				spsdc_trigger_transaction(host);
   813				spsdc_xfer_data_pio(host, data);
   814				spsdc_wait_finish(host);
   815				spsdc_finish_request(host, mrq);
   816			} else {
   817				if (!(host->use_int || host->dma_use_int)) {
   818					spsdc_trigger_transaction(host);
   819					spsdc_wait_finish(host);
   820					spsdc_finish_request(host, mrq);
   821				} else {
   822					spsdc_trigger_transaction(host);
   823				}
   824			}
   825		}
   826	}
   827	

---
0-DAY CI Kernel Test Service, Intel Corporation
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