linux-kernel - RE: [PATCH nvmem 1/1] nvmem: imx: correct the fuse word index

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Message-ID: <VI1PR0402MB3600334A0B2E8FFACF08E9E8FFCF0@VI1PR0402MB3600.eurprd04.prod.outlook.com>
Date:   Mon, 15 Jul 2019 05:35:25 +0000
From:   Andy Duan <fugang.duan@....com>
To:     Andy Duan <fugang.duan@....com>,
        "srinivas.kandagatla@...aro.org" <srinivas.kandagatla@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH nvmem 1/1] nvmem: imx: correct the fuse word index

Ping ...

> From: Fugang Duan <fugang.duan@....com>
> 
> iMX8 fuse word index represent as one 4-bytes word, it should not be divided
> by 4.
> 
> Exp:
> - MAC0 address layout in fuse:
> offset 708: MAC[3] MAC[2] MAC[1] MAC[0]
> offset 709: XX     xx     MAC[5] MAC[4]
> 
> Signed-off-by: Fugang Duan <fugang.duan@....com>
> ---
>  drivers/nvmem/imx-ocotp-scu.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/nvmem/imx-ocotp-scu.c b/drivers/nvmem/imx-ocotp-scu.c
> index d9dc482..be2f5f0 100644
> --- a/drivers/nvmem/imx-ocotp-scu.c
> +++ b/drivers/nvmem/imx-ocotp-scu.c
> @@ -71,8 +71,8 @@ static int imx_scu_ocotp_read(void *context, unsigned
> int offset,
>  	void *p;
>  	int i, ret;
> 
> -	index = offset >> 2;
> -	num_bytes = round_up((offset % 4) + bytes, 4);
> +	index = offset;
> +	num_bytes = round_up(bytes, 4);
>  	count = num_bytes >> 2;
> 
>  	if (count > (priv->data->nregs - index)) @@ -100,7 +100,7 @@ static int
> imx_scu_ocotp_read(void *context, unsigned int offset,
>  		buf++;
>  	}
> 
> -	memcpy(val, (u8 *)p + offset % 4, bytes);
> +	memcpy(val, (u8 *)p, bytes);
> 
>  	kfree(p);
> 
> --
> 2.7.4