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SubjectRe: [PATCH v10 08/17] mtd: spi-nor: core: use dummy cycle and address width info from SFDP
Date
On 6/23/20 9:30 PM, Pratyush Yadav wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> The xSPI Profile 1.0 table specifies how many dummy cycles and address
> bytes are needed for the Read Status Register command in octal DTR mode.
> Use that information to send the correct Read SR command.
>
> Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
> ---
> drivers/mtd/spi-nor/core.c | 25 +++++++++++++++++++++++--
> 1 file changed, 23 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index 7d24e63fcca8..f2748f1d9957 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -357,6 +357,8 @@ int spi_nor_write_disable(struct spi_nor *nor)
> static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
> {
> int ret;
> + u8 addr_bytes = nor->params->rdsr_addr_nbytes;
> + u8 dummy = nor->params->rdsr_dummy;

no need to introduce local variables for a single dereference

>
> if (nor->spimem) {
> struct spi_mem_op op =
> @@ -365,10 +367,21 @@ static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
> SPI_MEM_OP_NO_DUMMY,
> SPI_MEM_OP_DATA_IN(1, sr, 1));
>
> + if (spi_nor_protocol_is_dtr(nor->reg_proto)) {
> + op.addr.nbytes = addr_bytes;
> + op.addr.val = 0;

isn't addr already initialized to 0?

> + op.dummy.nbytes = dummy;
> + }
> +
> + spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
> +
> ret = spi_mem_exec_op(nor->spimem, &op);
> } else {
> - ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDSR,
> - sr, 1);
> + if (spi_nor_protocol_is_dtr(nor->reg_proto))
> + ret = -ENOTSUPP;
> + else
> + ret = nor->controller_ops->read_reg(nor, SPINOR_OP_RDSR,
> + sr, 1);
> }

doesn't this belong to a previous patch?

>
> if (ret)
> @@ -388,6 +401,8 @@ static int spi_nor_read_sr(struct spi_nor *nor, u8 *sr)
> static int spi_nor_read_fsr(struct spi_nor *nor, u8 *fsr)
> {
> int ret;
> + u8 addr_bytes = nor->params->rdsr_addr_nbytes;
> + u8 dummy = nor->params->rdsr_dummy;
>
> if (nor->spimem) {
> struct spi_mem_op op =
> @@ -396,6 +411,12 @@ static int spi_nor_read_fsr(struct spi_nor *nor, u8 *fsr)
> SPI_MEM_OP_NO_DUMMY,
> SPI_MEM_OP_DATA_IN(1, fsr, 1));
>
> + if (spi_nor_protocol_is_dtr(nor->reg_proto)) {
> + op.addr.nbytes = addr_bytes;
> + op.addr.val = 0;
> + op.dummy.nbytes = dummy;
> + }
> +
> spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
>
> ret = spi_mem_exec_op(nor->spimem, &op);
> --
> 2.27.0
>

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