[PATCH v2] mmc: mmc_spi: Print verbose debug output when crc16 check fails

[Sean Anderson <seanga2@gmail.com>]

On 1/17/21 7:27 AM, Bin Meng wrote:
> Add some verbose debug output when crc16 check fails.
> 
> Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
> Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
> 
> ---
> 
> Changes in v2:
> - do the crc_ok assignment at the the same line where it's defined
> 
>   drivers/mmc/mmc_spi.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/mmc_spi.c b/drivers/mmc/mmc_spi.c
> index 46800bbed2..b1edb6ad7c 100644
> --- a/drivers/mmc/mmc_spi.c
> +++ b/drivers/mmc/mmc_spi.c
> @@ -181,8 +181,10 @@ static int mmc_spi_readdata(struct udevice *dev,
>   			if (ret)
>   				return ret;
>   #ifdef CONFIG_MMC_SPI_CRC_ON
> -			if (be16_to_cpu(crc16_ccitt(0, buf, bsize)) != crc) {
> -				debug("%s: data crc error\n", __func__);
> +			u16 crc_ok = be16_to_cpu(crc16_ccitt(0, buf, bsize));
> +			if (crc_ok != crc) {
> +				debug("%s: data crc error, expect %04x get %04x\n",

Nit: Perhaps use expected/got?

Otherwise looks good to me; I ended up creating a similar patch
previously, but never got around to upstreaming it.

--Sean

> +				      __func__, crc_ok, crc);
>   				r1 = R1_SPI_COM_CRC;
>   				break;
>   			}
>