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SubjectRe: [PATCH] mtd: spi-nor: cadence-quadspi: write upto 8-bytes data in STIG mode
Date
+ Vignesh

On 01/28/2019 07:02 AM, Purna Chandra Mandal wrote:
> cadence-quadspi controller allows upto eight bytes of data to
> be written in software Triggered Instruction generator (STIG) mode
> of operation. Lower 4 bytes are written through writedatalower and
> upper 4 bytes by writedataupper register.
>
> This patch allows all the 8 bytes to be written.
>
> Signed-off-by: Purna Chandra Mandal <purna.chandra.mandal@intel.com>

Looks good for me:
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>

Vignesh, can we have your R-b or T-b tag?

Cheers,
ta

> ---
>
> drivers/mtd/spi-nor/cadence-quadspi.c | 15 ++++++++++++---
> 1 file changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
> index 04cedd3a2bf6..7f78f9409ddd 100644
> --- a/drivers/mtd/spi-nor/cadence-quadspi.c
> +++ b/drivers/mtd/spi-nor/cadence-quadspi.c
> @@ -418,9 +418,10 @@ static int cqspi_command_write(struct spi_nor *nor, const u8 opcode,
> void __iomem *reg_base = cqspi->iobase;
> unsigned int reg;
> unsigned int data;
> + u32 write_len;
> int ret;
>
> - if (n_tx > 4 || (n_tx && !txbuf)) {
> + if (n_tx > CQSPI_STIG_DATA_LEN_MAX || (n_tx && !txbuf)) {
> dev_err(nor->dev,
> "Invalid input argument, cmdlen %d txbuf 0x%p\n",
> n_tx, txbuf);
> @@ -433,10 +434,18 @@ static int cqspi_command_write(struct spi_nor *nor, const u8 opcode,
> reg |= ((n_tx - 1) & CQSPI_REG_CMDCTRL_WR_BYTES_MASK)
> << CQSPI_REG_CMDCTRL_WR_BYTES_LSB;
> data = 0;
> - memcpy(&data, txbuf, n_tx);
> + write_len = (n_tx > 4) ? 4 : n_tx;
> + memcpy(&data, txbuf, write_len);
> + txbuf += write_len;
> writel(data, reg_base + CQSPI_REG_CMDWRITEDATALOWER);
> - }
>
> + if (n_tx > 4) {
> + data = 0;
> + write_len = n_tx - 4;
> + memcpy(&data, txbuf, write_len);
> + writel(data, reg_base + CQSPI_REG_CMDWRITEDATAUPPER);
> + }
> + }
> ret = cqspi_exec_flash_cmd(cqspi, reg);
> return ret;
> }
>
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