netdev - Re: [PATCH net-next v2 11/21] net: ravb: Move DBAT configuration to the driver's ndo

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Date: Fri, 15 Dec 2023 00:03:59 +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>,
	<geert+renesas@...der.be>
CC: <netdev@...r.kernel.org>, <linux-renesas-soc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Claudiu Beznea
	<claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH net-next v2 11/21] net: ravb: Move DBAT configuration to
 the driver's ndo_open API

On 12/14/23 2:45 PM, 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.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>

[...]
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 04eaa1967651..6b8ca08be35e 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -1822,6 +1822,7 @@ 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);
>  
>  	/* Device init */
>  	error = ravb_dmac_init(ndev);
> @@ -2841,7 +2842,6 @@ static int ravb_probe(struct platform_device *pdev)
>  	}
>  	for (q = RAVB_BE; q < DBAT_ENTRY_NUM; q++)
>  		priv->desc_bat[q].die_dt = DT_EOS;
> -	ravb_write(ndev, priv->desc_bat_dma, DBAT);
>  
>  	/* Initialise HW timestamp list */
>  	INIT_LIST_HEAD(&priv->ts_skb_list);
> 

  How about also removing the DBAT write from ravb_resume()?

MBR, Sergey