Re: [PATCH] mtd: rawnand: qcom: Implement exec_op()

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

Hi Md,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on mtd/nand/next]
[also build test WARNING on v5.18 next-20220603]
[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/intel-lab-lkp/linux/commits/Md-Sadre-Alam/mtd-rawnand-qcom-Implement-exec_op/20220605-235824
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next
config: arm64-randconfig-r021-20220605 (https://download.01.org/0day-ci/archive/20220606/202206060716.xdJ89V2D-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 416a5080d89066029f9889dc23f94de47c2fa895)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/5ab4409034966f5503f62ef2df59408762a9e872
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Md-Sadre-Alam/mtd-rawnand-qcom-Implement-exec_op/20220605-235824
        git checkout 5ab4409034966f5503f62ef2df59408762a9e872
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/mtd/nand/raw/ drivers/nfc/nfcmrvl/

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

All warnings (new ones prefixed by >>):

>> drivers/mtd/nand/raw/qcom_nandc.c:2727:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
           default:
           ^
   drivers/mtd/nand/raw/qcom_nandc.c:2727:2: note: insert 'break;' to avoid fall-through
           default:
           ^
           break; 
   1 warning generated.


vim +2727 drivers/mtd/nand/raw/qcom_nandc.c

  2691	
  2692	static int qcom_nand_exec_instr(struct nand_chip *chip,
  2693					const struct nand_op_instr *instr)
  2694	{
  2695		struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
  2696		struct qcom_nand_host *host = to_qcom_nand_host(chip);
  2697		u32 status;
  2698		int ret = 0;
  2699		bool wait = false;
  2700		static int opcode;
  2701	
  2702		switch (instr->type) {
  2703		case NAND_OP_CMD_INSTR:
  2704			ret = qcom_nand_send_command(chip, instr->ctx.cmd.opcode);
  2705			if (instr->ctx.cmd.opcode == NAND_CMD_RESET)
  2706				wait = true;
  2707			opcode = instr->ctx.cmd.opcode;
  2708			break;
  2709		case NAND_OP_ADDR_INSTR:
  2710			qcom_nand_send_address(chip, instr, opcode);
  2711			if (opcode != NAND_CMD_READ0 && opcode != NAND_CMD_READSTART &&
  2712			    opcode != NAND_CMD_PARAM && opcode != NAND_CMD_SEQIN)
  2713				wait = true;
  2714			break;
  2715		case NAND_OP_DATA_IN_INSTR:
  2716			qcom_nand_read_buf(chip, instr->ctx.data.buf.in, instr->ctx.data.len);
  2717			break;
  2718		case NAND_OP_DATA_OUT_INSTR:
  2719			wait = false;
  2720			break;
  2721		case NAND_OP_WAITRDY_INSTR:
  2722			ret = readl_poll_timeout(nandc->base + NAND_FLASH_STATUS, status,
  2723						 (status & FS_READY_BSY_N), 20,
  2724						 instr->ctx.waitrdy.timeout_ms * 1000);
  2725			if (opcode == NAND_CMD_PARAM)
  2726				wait = true;
> 2727		default:
  2728			break;
  2729		}
  2730	
  2731		if (wait) {
  2732			if (opcode != NAND_CMD_PARAM)
  2733				write_reg_dma(nandc, NAND_EXEC_CMD, 1, NAND_BAM_NEXT_SGL);
  2734	
  2735			if (opcode == NAND_CMD_READID)
  2736				read_reg_dma(nandc, NAND_READ_ID, 1, NAND_BAM_NEXT_SGL);
  2737	
  2738			if (opcode == NAND_CMD_ERASE1) {
  2739				read_reg_dma(nandc, NAND_FLASH_STATUS, 1, NAND_BAM_NEXT_SGL);
  2740				write_reg_dma(nandc, NAND_FLASH_STATUS, 1, 0);
  2741				write_reg_dma(nandc, NAND_READ_STATUS, 1, NAND_BAM_NEXT_SGL);
  2742			}
  2743	
  2744			ret = submit_descs(nandc);
  2745			if (ret)
  2746				dev_err(nandc->dev, "failure submitting descs for command 0x%02x\n",
  2747					opcode);
  2748	
  2749			free_descs(nandc);
  2750			post_command(host, opcode);
  2751		}
  2752	
  2753		return ret;
  2754	}
  2755	

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