linux-kernel - Re: [PATCH net-next v3 11/19] net: ravb: Move DBAT configuration to the driver's ndo

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Date: Sat, 6 Jan 2024 23:34:45 +0300
From: Sergey Shtylyov <s.shtylyov@....ru>
To: Claudiu <claudiu.beznea@...on.dev>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<richardcochran@...il.com>, <p.zabel@...gutronix.de>,
	<yoshihiro.shimoda.uh@...esas.com>, <wsa+renesas@...g-engineering.com>
CC: <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <geert+renesas@...der.be>, Claudiu Beznea
	<claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH net-next v3 11/19] net: ravb: Move DBAT configuration to
 the driver's ndo_open API

On 1/5/24 11:23 AM, Claudiu wrote:

> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> DBAT setup was done in the driver's probe API. As some IP variants switch
> to reset mode (and thus registers content is lost) when setting clocks
> (due to module standby functionality) to be able to implement runtime PM
> move the DBAT configuration in the driver's ndo_open API.
> 
> This commit prepares the code for the addition of runtime PM.
> 
> Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
[...]

> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 946abd7606ca..dbc26c3e95ec 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -1826,6 +1826,7 @@ static int ravb_open(struct net_device *ndev)
>  		napi_enable(&priv->napi[RAVB_NC]);
>  
>  	ravb_set_delay_mode(ndev);
> +	ravb_write(ndev, priv->desc_bat_dma, DBAT);

   Please do consider moving this to ravb_dmac_init(), at least in
the future...

>  
>  	/* Device init */
>  	error = ravb_dmac_init(ndev);

MBR, Sergey