linux-kernel - Re: [PATCH v5 01/19] spi: spi-mem: allow specifying whether an op is DTR or not

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Message-ID: <20200522104536.4ikmhiaxg7keahdp@ti.com>
Date:   Fri, 22 May 2020 16:15:36 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     <masonccyang@...c.com.tw>
CC:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Mark Brown <broonie@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-mtd@...ts.infradead.org>, <linux-spi@...r.kernel.org>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Sekhar Nori <nsekhar@...com>,
        Richard Weinberger <richard@....at>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Vignesh Raghavendra <vigneshr@...com>, <juliensu@...c.com.tw>
Subject: Re: [PATCH v5 01/19] spi: spi-mem: allow specifying whether an op is
 DTR or not

[Seems like I forgot to send this and it stayed in my Drafts folder. 
Anyway, fixed in v7]

Hi Mason,

On 21/05/20 04:27PM, masonccyang@...c.com.tw wrote:
> 
> Hi Pratyush,
> 
> Given cmd.nbytes a initial value & check it !
> 
> > 
> > [PATCH v5 01/19] spi: spi-mem: allow specifying whether an op is DTR or 
> not
> > 
> > Each phase is given a separate 'dtr' field so mixed protocols like
> > 4S-4D-4D can be supported.
> > 
> > Signed-off-by: Pratyush Yadav <p.yadav@...com>
> > ---
> >  drivers/spi/spi-mem.c       | 3 +++
> >  include/linux/spi/spi-mem.h | 8 ++++++++
> >  2 files changed, 11 insertions(+)
> > 
> > diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
> > index 9a86cc27fcc0..93e255287ab9 100644
> > --- a/drivers/spi/spi-mem.c
> > +++ b/drivers/spi/spi-mem.c
> > @@ -156,6 +156,9 @@ bool spi_mem_default_supports_op(struct spi_mem 
> *mem,
> >                 op->data.dir == SPI_MEM_DATA_OUT))
> >        return false;
> > 
> > +   if (op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr)
> > +      return false;
> > +
> 
> +       if (op->cmd.nbytes != 1)
> +               return false;

Good catch. Will fix.
 
> >     return true;
> >  }
> >  EXPORT_SYMBOL_GPL(spi_mem_default_supports_op);
> 
> 
>  static int spi_mem_check_op(const struct spi_mem_op *op)
>  {
> -                if (!op->cmd.buswidth)
> +                if (!op->cmd.buswidth || op->cmd.nbytes < 1 || 
> op->cmd.nbytes > 2)
>                                  return -EINVAL;

Will fix.
 
> 
> > diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h
> > index af9ff2f0f1b2..e3dcb956bf61 100644
> > --- a/include/linux/spi/spi-mem.h
> > +++ b/include/linux/spi/spi-mem.h
> 
> #define SPI_MEM_OP_CMD(__opcode, __buswidth)                    \
>          {                                                       \
>                  .buswidth = __buswidth,                         \
>                  .opcode = __opcode,                             \
> +                .nbytes = 1,                                    \
>          }

Will fix. Thanks.

-- 
Regards,
Pratyush Yadav
Texas Instruments India