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Date:   Mon, 18 Feb 2019 15:22:11 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     David Chen <david0813@...il.com>, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     davem@...emloft.net, hayeswang@...ltek.com,
        mario.limonciello@...l.com, bigeasy@...utronix.de,
        edumazet@...gle.com, f.fainelli@...il.com, david.chen7@...l.com,
        kai.heng.feng@...onical.com, zhongjiang@...wei.com
Subject: Re: [PATCH] [V2]r8152: Add support for MAC address pass through on
 RTL8153-BD

On 18. 02. 19, 15:00, David Chen wrote:
> From: David Chen <david.chen7@...l.com>
> 
> RTL8153-BD is used in Dell DA300 type-C dongle.
> It should be added to the whitelist of devices to activate MAC address
> pass through.
> 
> Per confirming with Realtek all devices containing RTL8153-BD should
> activate MAC pass through and there won't use pass through bit on efuse
> like in RTL8153-AD.
> 
> Signed-off-by: David Chen <david.chen7@...l.com>
> ---
>  drivers/net/usb/r8152.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
> index 60dd1ec1665f..86c8c64fbb0f 100644
> --- a/drivers/net/usb/r8152.c
> +++ b/drivers/net/usb/r8152.c
> @@ -557,6 +557,7 @@ enum spd_duplex {
>  /* MAC PASSTHRU */
>  #define AD_MASK			0xfee0
>  #define BND_MASK		0x0004
> +#define BD_MASK			0x0001
>  #define EFUSE			0xcfdb
>  #define PASS_THRU_MASK		0x1
>  
> @@ -1176,9 +1177,9 @@ static int vendor_mac_passthru_addr_read(struct r8152 *tp, struct sockaddr *sa)
>  			return -ENODEV;
>  		}
>  	} else {
> -		/* test for RTL8153-BND */
> +		/* test for RTL8153-BND and RTL8153-BD */
>  		ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, USB_MISC_1);
> -		if ((ocp_data & BND_MASK) == 0) {
> +		if ((ocp_data & BND_MASK) == 0 && (ocp_data & BD_MASK) == 0) {

Can you ensure that BND won't have the BD's bit set and vice versa? I.e.
should the check be something like:
  if (isBND() && (ocp_data & BND_MASK) == 0 ||
      isBD() && (ocp_data & BD_MASK) == 0)
instead?

thanks,
-- 
js
suse labs

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