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

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Date:   Thu, 4 Jul 2019 17:45:43 +0200
From:   Lothar Waßmann <LW@...O-electronics.de>
To:     fugang.duan@....com
Cc:     srinivas.kandagatla@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        festevam@...il.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH nvmem 1/1] nvmem: imx: correct the fuse word index

Hi,

On Thu,  4 Jul 2019 22:20:15 +0800 fugang.duan@....com wrote:
> 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);
>  
With these changes you could use the 'val' pointer directly
as the destination for ocotp_read() without need for an intermediate
buffer.


Lothar Waßmann