linux-kernel - Re: [PATCH 1/1] driver:mtd:spi-nor: Add Micron quad I/O support

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Message-Id: <201409251211.57183.marex@denx.de>
Date:	Thu, 25 Sep 2014 12:11:57 +0200
From:	Marek Vasut <marex@...x.de>
To:	bpqw <bpqw@...ron.com>
Cc:	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	"b32955@...escale.com" <b32955@...escale.com>,
	"geert+renesas@...der.be" <geert+renesas@...der.be>,
	"grmoore@...era.com" <grmoore@...era.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] driver:mtd:spi-nor: Add Micron quad I/O support

On Thursday, September 25, 2014 at 08:20:35 AM, bpqw wrote:
> For Micron spi norflash,you can enable Quad spi transfer
> by clear EVCR(Enhanced Volatile Configuration Register)
> Quad I/O protocol bit.
> 
> Signed-off-by: bean huo <beanhuo@...ron.com>
> ---
>  drivers/mtd/spi-nor/spi-nor.c |   45
> +++++++++++++++++++++++++++++++++++++++++ include/linux/mtd/spi-nor.h   | 
>   6 ++++++
>  2 files changed, 51 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index b5ad6be..e72894f 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -878,6 +878,44 @@ static int spansion_quad_enable(struct spi_nor *nor)
>  	return 0;
>  }
> 
> +static int micron_quad_enable(struct spi_nor *nor)
> +{
> +	int ret, val;
> +
> +	ret = nor->read_reg(nor, SPINOR_OP_RD_EVCR, &val, 1);
> +	if (ret < 0) {
> +		dev_err(nor->dev, "error %d reading EVCR\n", ret);
> +		return -EINVAL;
> +	}
> +
> +	write_enable(nor);
> +
> +	/* set EVCR ,enable quad I/O */
> +	nor->cmd_buf[0] = val & ~EVCR_QUAD_EN_MICRON;
> +	ret = nor->write_reg(nor, SPINOR_OP_WD_EVCR, nor->cmd_buf, 1, 0);
> +	if (ret < 0) {
> +		dev_err(nor->dev,
> +			"error while writing EVCR register\n");
> +		return -EINVAL;
> +	}
> +
> +	if (wait_till_ready(nor))
> +		return 1;

Why does this not return proper error code or even better, return value from 
wait_till_ready() ?

Other than that, there's nothing wrong with the patch I think.

Best regards,
Marek Vasut
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