Re: [PATCH v2 1/9] mtd: spi-nor: improve macronix_quad_enable()
From: Jagan Teki
Date: Mon Oct 24 2016 - 03:35:32 EST
On Wed, Oct 5, 2016 at 5:30 PM, Cyrille Pitchen
<cyrille.pitchen@xxxxxxxxx> wrote:
> The patch checks whether the Quad Enable bit is already set in the Status
> Register. If so, the function exits immediately with a successful return
> code. Otherwise, a message is now printed telling we're setting the
> non-volatile bit.
>
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@xxxxxxxxx>
Reviewed-by: Jagan Teki <jagan@xxxxxxxxxxxx>
> ---
> drivers/mtd/spi-nor/spi-nor.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index d0fc165d7d66..5c87b2d99507 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -1211,6 +1211,11 @@ static int macronix_quad_enable(struct spi_nor *nor)
> val = read_sr(nor);
> if (val < 0)
> return val;
> + if (val & SR_QUAD_EN_MX)
> + return 0;
> +
> + /* Update the Quad Enable bit. */
> + dev_info(nor->dev, "setting Macronix Quad Enable (non-volatile) bit\n");
> write_enable(nor);
>
> write_sr(nor, val | SR_QUAD_EN_MX);
Safe to save ret and check the same as well.
thanks!
--
Jagan Teki
Free Software Engineer | www.openedev.com
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.