linux-kernel - Re: [PATCH 1/2] mtd: rawnand: brcmnand: Don't default to edu transfer

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Date:   Thu, 11 Jun 2020 11:22:56 -0400
From:   Kamal Dasu <kdasu.kdev@...il.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Brian Norris <computersforpeace@...il.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        MTD Maling List <linux-mtd@...ts.infradead.org>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mtd: rawnand: brcmnand: Don't default to edu transfer

On Thu, Jun 11, 2020 at 3:16 AM Miquel Raynal <miquel.raynal@...tlin.com> wrote:
>
> Hi Kamal,
>
> Kamal Dasu <kdasu.kdev@...il.com> wrote on Thu, 11 Jun 2020 01:44:53
> -0400:
>
> > When flash-dma is absent do not default to using flash-edu.
> > Make sure flash-edu is enabled before setting EDU transfer
> > function.
> >
> > Fixes: a5d53ad26a8b ("mtd: rawnand: brcmnand: Add support for flash-edu for dma transfers")
> > Signed-off-by: Kamal Dasu <kdasu.kdev@...il.com>
> > ---
> >  drivers/mtd/nand/raw/brcmnand/brcmnand.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> > index 8f9ffb46a09f..0c1d6e543586 100644
> > --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> > +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> > @@ -2953,8 +2953,9 @@ int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc)
> >               if (ret < 0)
> >                       goto err;
> >
> > -             /* set edu transfer function to call */
> > -             ctrl->dma_trans = brcmnand_edu_trans;
> > +             if (has_edu(ctrl))
> > +                     /* set edu transfer function to call */
> > +                     ctrl->dma_trans = brcmnand_edu_trans;
>
> Does this fallback to returning an error in case !has_edu() ? Othewise,
> how is it handled?
>

 The driver will default to pio if both flash-dma and falsh-edu are
not present.

> Thanks,
> Miquèl

Kamal