[PATCH] mtd: spi-nor: handle unsupported FSR opcodes properly

[Mika Westerberg]

Hi,

On Tue, Jun 14, 2022 at 05:56:54PM +0000, Oleksandr Ocheretnyi -X (oocheret - GLOBALLOGIC INC at Cisco) wrote:
>    Hello Mika,
> 
>    in my case (I work with memory chip n25q128a13 for recent kernels) I'm
>    getting return value -ENOTSUPP from spi_mem_exec_op() call in the
>    micron_st_nor_read_fsr() method
>    [[1]https://elixir.bootlin.com/linux/v5.19-rc2/source/drivers/spi/spi-m
>    em.c#L326]. So I decided to provide the same errorcode to
>    intel_spi_hw_cycle() method because older kernel versions throw the
>    error there. It is fine to use -EOPNOTSUPP return value instead.
> 
>    I suspect we need to cover both cases to check -ENOTSUPP as well as
>    -EOPNOTSUPP to let the driver work properly.
> 
>    if (ret == -ENOTSUPP || ret == -EOPNOTSUPP)

I think we should follow the same in the Intel driver and return
-ENOTSUPP too.