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

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Date:   Thu, 16 Jun 2022 08:29:31 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Michael Walle <michael@...le.cc>
Cc:     "Oleksandr Ocheretnyi -X (oocheret - GLOBALLOGIC INC at Cisco)" 
        <oocheret@...co.com>,
        "tudor.ambarus@...rochip.com" <tudor.ambarus@...rochip.com>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "p.yadav@...com" <p.yadav@...com>,
        "richard@....at" <richard@....at>,
        "vigneshr@...com" <vigneshr@...com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "mauro.lima@...ypsium.com" <mauro.lima@...ypsium.com>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "xe-linux-external(mailer list)" <xe-linux-external@...co.com>
Subject: Re: [PATCH] mtd: spi-nor: handle unsupported FSR opcodes properly

On Wed, Jun 15, 2022 at 08:10:13PM +0200, Michael Walle wrote:
> Am 15. Juni 2022 11:49:22 OEZ schrieb Mika Westerberg <mika.westerberg@...ux.intel.com>:
> >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.
> 
> AFAIK ENOTSUPP is for nfs and shouldn't be used.

Yes, but that's what the SPI-NOR core is using so I think we want to be
consistent with it.