[U-Boot] [PATCH] spi: spi-mem: Fix read data size issue

[Vignesh Raghavendra]

On 10/07/19 2:53 PM, Ye Li wrote:
> When slave drivers don't set the max_read_size, the spi-mem should directly
> use data.nbytes and not limit to any size. But current logic will limit to
> the max_write_size.
> 

Indeed. Thanks for catching this!

Acked-by: Vignesh Raghavendra <vigneshr at ti.com>

> Signed-off-by: Ye Li <ye.li at nxp.com>
> ---
>  drivers/spi/spi-mem.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
> index b86eee7..be440fe 100644
> --- a/drivers/spi/spi-mem.c
> +++ b/drivers/spi/spi-mem.c
> @@ -423,12 +423,14 @@ int spi_mem_adjust_op_size(struct spi_slave *slave, struct spi_mem_op *op)
>  		if (slave->max_write_size && len > slave->max_write_size)
>  			return -EINVAL;
>  
> -		if (op->data.dir == SPI_MEM_DATA_IN && slave->max_read_size)
> -			op->data.nbytes = min(op->data.nbytes,
> +		if (op->data.dir == SPI_MEM_DATA_IN) {
> +			if (slave->max_read_size)
> +				op->data.nbytes = min(op->data.nbytes,
>  					      slave->max_read_size);
> -		else if (slave->max_write_size)
> +		} else if (slave->max_write_size) {
>  			op->data.nbytes = min(op->data.nbytes,
>  					      slave->max_write_size - len);
> +		}
>  
>  		if (!op->data.nbytes)
>  			return -EINVAL;
> 

-- 
Regards
Vignesh