netdev - Re: [PATCH 1/2] net: usb: ax88179_178a: fix failed operations during ax88179

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Date: Thu, 16 Nov 2023 10:37:55 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>, davem@...emloft.net,
  edumazet@...gle.com, kuba@...nel.org, linux-usb@...r.kernel.org, 
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: weihao.bj@...system.com
Subject: Re: [PATCH 1/2] net: usb: ax88179_178a: fix failed operations
 during ax88179_reset

On Tue, 2023-11-14 at 13:50 +0100, Jose Ignacio Tornos Martinez wrote:
> Using generic ASIX Electronics Corp. AX88179 Gigabit Ethernet device,
> the following test cycle has been implemented:
>     - power on
>     - check logs
>     - shutdown
>     - after detecting the system shutdown, disconnect power
>     - after approximately 60 seconds of sleep, power is restored
> Running some cycles, sometimes error logs like this appear:
>     kernel: ax88179_178a 2-9:1.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0001: -19
>     kernel: ax88179_178a 2-9:1.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0001: -19
>     ...
> These failed operation are happening during ax88179_reset execution, so
> the initialization could not be correct.
> 
> In order to avoid this, we need to increase the delay after reset and
> clock initial operations. By using these larger values, many cycles
> have been run and no failed operations appear.
> 
> Reported-by: Herb Wei <weihao.bj@...system.com>
> Tested-by: Herb Wei <weihao.bj@...system.com>
> Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>

We need at least a suitable Fixes tag

> ---
>  drivers/net/usb/ax88179_178a.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
> index aff39bf3161d..4ea0e155bb0d 100644
> --- a/drivers/net/usb/ax88179_178a.c
> +++ b/drivers/net/usb/ax88179_178a.c
> @@ -1583,11 +1583,11 @@ static int ax88179_reset(struct usbnet *dev)
>  
>  	*tmp16 = AX_PHYPWR_RSTCTL_IPRL;
>  	ax88179_write_cmd(dev, AX_ACCESS_MAC, AX_PHYPWR_RSTCTL, 2, 2, tmp16);
> -	msleep(200);
> +	msleep(500);

Do you know if there is some status register you can query for 'reset
completed'? or some official documentation you can quote for the above
delay?

Thanks!

Paolo