linux-kernel - Re: [PATCH] mtd: spi-nor: Support controllers with limited TX FIFO size

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Date:   Wed, 3 Oct 2018 09:10:58 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Yogesh Gaur <yogeshnarayan.gaur@....com>
Cc:     linux-mtd@...ts.infradead.org, frieder.schrempf@...eet.de,
        computersforpeace@...il.com, david.wolfe@....com, han.xu@....com,
        festevam@...il.com, marek.vasut@...il.com,
        prabhakar.kushwaha@....com, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: spi-nor: Support controllers with limited TX FIFO
 size

On Wed, 13 Jun 2018 11:38:12 +0530
Yogesh Gaur <yogeshnarayan.gaur@....com> wrote:

> Some SPI controllers can't write nor->page_size bytes in a single
> step because their TX FIFO is too small.
> 
> Allow nor->write() to return a size that is smaller than the requested
> write size to gracefully handle this case.
> 
> Signed-off-by: Yogesh Gaur <yogeshnarayan.gaur@....com>

Queued to spi-nor/next.

Thanks,

Boris

> ---
>  drivers/mtd/spi-nor/spi-nor.c | 7 -------
>  1 file changed, 7 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 5bfa36e..3e63543 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -1431,13 +1431,6 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
>  			goto write_err;
>  		*retlen += written;
>  		i += written;
> -		if (written != page_remain) {
> -			dev_err(nor->dev,
> -				"While writing %zu bytes written %zd bytes\n",
> -				page_remain, written);
> -			ret = -EIO;
> -			goto write_err;
> -		}
>  	}
>  
>  write_err: