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Date:   Wed, 2 Dec 2020 08:09:26 +0800
From:   kernel test robot <lkp@...el.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, broonie@...nel.org,
        robh+dt@...nel.org
Cc:     kbuild-all@...ts.01.org, skomatineni@...dia.com,
        linux-spi@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 3/7] spi: qspi-tegra: Add support for Tegra210 QSPI
 controller

Hi Sowjanya,

I love your patch! Perhaps something to improve:

[auto build test WARNING on spi/for-next]
[also build test WARNING on robh/for-next tegra/for-next v5.10-rc6 next-20201201]
[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/Sowjanya-Komatineni/Add-Tegra-QSPI-driver/20201202-051629
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
config: riscv-allyesconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 9.3.0
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/a8da475b681c83105cdb8daf7408cc92aca9f65a
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Sowjanya-Komatineni/Add-Tegra-QSPI-driver/20201202-051629
        git checkout a8da475b681c83105cdb8daf7408cc92aca9f65a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv 

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

All warnings (new ones prefixed by >>):

   drivers/spi/qspi-tegra.c: In function 'tegra_qspi_transfer_one_message':
>> drivers/spi/qspi-tegra.c:935:7: warning: variable 'skip' set but not used [-Wunused-but-set-variable]
     935 |  bool skip = false;
         |       ^~~~

vim +/skip +935 drivers/spi/qspi-tegra.c

   925	
   926	static int tegra_qspi_transfer_one_message(struct spi_master *master,
   927						   struct spi_message *msg)
   928	{
   929		bool is_first_msg = true;
   930		struct tegra_qspi_data *tqspi = spi_master_get_devdata(master);
   931		struct spi_transfer *xfer;
   932		struct spi_device *spi = msg->spi;
   933		u8 dummy_cycles, ntransfers = 0;
   934		int ret;
 > 935		bool skip = false;
   936		int xfer_phase = 0;
   937	
   938		msg->status = 0;
   939		msg->actual_length = 0;
   940		tqspi->tx_status = 0;
   941		tqspi->rx_status = 0;
   942	
   943		/*
   944		 * Tegra QSPI hardware support dummy bytes transfer based on the
   945		 * programmed dummy clock cyles in QSPI register.
   946		 * So, get the total dummy bytes from the dummy bytes transfer in
   947		 * spi_messages and convert to dummy clock cyles.
   948		 */
   949		list_for_each_entry(xfer, &msg->transfers, transfer_list) {
   950			if (ntransfers == DUMMY_BYTES_XFER &&
   951			    !(list_is_last(&xfer->transfer_list, &msg->transfers)))
   952				dummy_cycles = xfer->len * 8 / xfer->tx_nbits;
   953			ntransfers++;
   954		}
   955	
   956		list_for_each_entry(xfer, &msg->transfers, transfer_list) {
   957			u32 cmd1;
   958	
   959			/*
   960			 * Program dummy clock cycles in Tegra QSPI register only
   961			 * during address transfer phase.
   962			 */
   963			if (xfer_phase == ADDR_BYTES_XFER)
   964				tqspi->dummy_cycles = dummy_cycles;
   965			else
   966				tqspi->dummy_cycles = 0;
   967	
   968			/*
   969			 * Tegra QSPI hardware support dummy bytes transfer.
   970			 * So, skip the transfer of dummy bytes from the software.
   971			 */
   972			if (ntransfers == MAX_XFERS &&
   973			    xfer_phase == DUMMY_BYTES_XFER) {
   974				msg->actual_length += xfer->len;
   975				xfer_phase++;
   976				continue;
   977			}
   978	
   979			reinit_completion(&tqspi->xfer_completion);
   980	
   981			cmd1 = tegra_qspi_setup_transfer_one(spi, xfer, is_first_msg);
   982			if (!xfer->len) {
   983				ret = 0;
   984				skip = true;
   985				goto exit;
   986			}
   987	
   988			ret = tegra_qspi_start_transfer_one(spi, xfer, cmd1);
   989			if (ret < 0) {
   990				dev_err(tqspi->dev,
   991					"failed to start transfer: %d\n", ret);
   992				goto exit;
   993			}
   994	
   995			is_first_msg = false;
   996			ret = wait_for_completion_timeout(&tqspi->xfer_completion,
   997							  QSPI_DMA_TIMEOUT);
   998			if (WARN_ON(ret == 0)) {
   999				dev_err(tqspi->dev,
  1000					"qspi transfer timeout: %d\n", ret);
  1001				if (tqspi->is_curr_dma_xfer &&
  1002				    (tqspi->cur_direction & DATA_DIR_TX))
  1003					dmaengine_terminate_all(tqspi->tx_dma_chan);
  1004				if (tqspi->is_curr_dma_xfer &&
  1005				    (tqspi->cur_direction & DATA_DIR_RX))
  1006					dmaengine_terminate_all(tqspi->rx_dma_chan);
  1007				ret = -EIO;
  1008				tegra_qspi_dump_regs(tqspi);
  1009				tegra_qspi_flush_fifos(tqspi);
  1010				reset_control_assert(tqspi->rst);
  1011				udelay(2);
  1012				reset_control_deassert(tqspi->rst);
  1013				goto exit;
  1014			}
  1015	
  1016			if (tqspi->tx_status ||  tqspi->rx_status) {
  1017				ret = -EIO;
  1018				dev_err(tqspi->dev, "error in transfer: %d\n", ret);
  1019				tegra_qspi_dump_regs(tqspi);
  1020				goto exit;
  1021			}
  1022	
  1023			msg->actual_length += xfer->len;
  1024			xfer_phase++;
  1025		}
  1026	
  1027		ret = 0;
  1028	exit:
  1029		tegra_qspi_writel(tqspi, tqspi->def_command1_reg, QSPI_COMMAND1);
  1030		msg->status = ret;
  1031		spi_finalize_current_message(master);
  1032		return ret;
  1033	}
  1034	

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

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