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

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Date:   Thu, 11 Jun 2020 09:16:04 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Kamal Dasu <kdasu.kdev@...il.com>
Cc:     Brian Norris <computersforpeace@...il.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH  1/2] mtd: rawnand: brcmnand: Don't default to edu
 transfer

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?

Thanks,
Miquèl