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@xxxxxxxxx> 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@xxxxxxxxxxxx
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