netdev - Re: [PATCH net-next 06/18] ravb: Factorise ptp feature

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Date:   Fri, 23 Jul 2021 23:56:51 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Biju Das <biju.das.jz@...renesas.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Shtylyov <s.shtylyov@...russia.ru>,
        Adam Ford <aford173@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Yuusuke Ashizuka <ashiduka@...itsu.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH net-next 06/18] ravb: Factorise ptp feature

HEllo!

On 7/22/21 5:13 PM, Biju Das wrote:

> Gptp is active in CONFIG mode for R-Car Gen3, where as it is not

   It's gPTP, the manuals say. :-)

> active in CONFIG mode for R-Car Gen2. Add feature bits to handle
> both cases.

   I have no idea why this single diff requires 2 fetaure bits....

> RZ/G2L does not support ptp feature.

   Ah, that explains it. :-)
   It doesn't explain why we should bother with the 2nd bit in the same patch tho...

> Factorise ptp feature
> specific to R-Car.
> 
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
>  drivers/net/ethernet/renesas/ravb.h      |  1 +
>  drivers/net/ethernet/renesas/ravb_main.c | 81 ++++++++++++++++--------
>  2 files changed, 56 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
> index 0ed21262f26b..a474ed68db22 100644
> --- a/drivers/net/ethernet/renesas/ravb.h
> +++ b/drivers/net/ethernet/renesas/ravb.h
> @@ -998,6 +998,7 @@ struct ravb_drv_data {
>  	size_t skb_sz;
>  	u8 num_tx_desc;
>  	enum ravb_chip_id chip_id;
> +	u32 features;

   You didn't like bitfelds (in sh_eth) so much? :-)

[...]
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 84ebd6fef711..e966b76df32c 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -40,6 +40,14 @@
>  		 NETIF_MSG_RX_ERR | \
>  		 NETIF_MSG_TX_ERR)
>  
> +#define RAVB_PTP_CONFIG_ACTIVE		BIT(0)
> +#define RAVB_PTP_CONFIG_INACTIVE	BIT(1)

   If both bits are 0, it means GbEth?

> +
> +#define RAVB_PTP	(RAVB_PTP_CONFIG_ACTIVE | RAVB_PTP_CONFIG_INACTIVE)

   Hm?

> +
> +#define RAVB_RCAR_GEN3_FEATURES	RAVB_PTP_CONFIG_ACTIVE
> +#define RAVB_RCAR_GEN2_FEATURES	RAVB_PTP_CONFIG_INACTIVE

   Not sure whtehr these are necessary...

[...]
>  	}
>  
>  	/* gPTP interrupt status summary */
> -	if (iss & ISS_CGIS) {
> +	if ((info->features & RAVB_PTP) && (iss & ISS_CGIS)) {

   This is not a transparent change -- the fearture check came fromn nownere...

>  		ravb_ptp_interrupt(ndev);
>  		result = IRQ_HANDLED;
>  	}
[...]
> @@ -1275,7 +1286,8 @@ static int ravb_get_ts_info(struct net_device *ndev,
>  		(1 << HWTSTAMP_FILTER_NONE) |
>  		(1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) |
>  		(1 << HWTSTAMP_FILTER_ALL);
> -	info->phc_index = ptp_clock_index(priv->ptp.clock);
> +	if (data->features & RAVB_PTP)

   Again, not transparent...

> +		info->phc_index = ptp_clock_index(priv->ptp.clock);
>  
>  	return 0;
>  }
[...]
> @@ -1992,14 +2009,20 @@ static int ravb_set_gti(struct net_device *ndev)
>  static void ravb_set_config_mode(struct net_device *ndev)
>  {
>  	struct ravb_private *priv = netdev_priv(ndev);
> +	const struct ravb_drv_data *info = priv->info;
>  
> -	if (priv->chip_id == RCAR_GEN2) {
> +	switch (info->features & RAVB_PTP) {
> +	case RAVB_PTP_CONFIG_INACTIVE:
>  		ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG);
>  		/* Set CSEL value */
>  		ravb_modify(ndev, CCC, CCC_CSEL, CCC_CSEL_HPB);
> -	} else {
> +		break;
> +	case RAVB_PTP_CONFIG_ACTIVE:
>  		ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG |
>  			    CCC_GAC | CCC_CSEL_HPB);
> +		break;
> +	default:
> +		ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG);

   Not trasparent again...

[...]
> @@ -2182,13 +2205,15 @@ static int ravb_probe(struct platform_device *pdev)
>  	/* Set AVB config mode */
>  	ravb_set_config_mode(ndev);
>  
> -	/* Set GTI value */
> -	error = ravb_set_gti(ndev);
> -	if (error)
> -		goto out_disable_refclk;
> +	if (info->features & RAVB_PTP) {

   Not transparent enough yet again...

> +		/* Set GTI value */
> +		error = ravb_set_gti(ndev);
> +		if (error)
> +			goto out_disable_refclk;
>  
> -	/* Request GTI loading */
> -	ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI);
> +		/* Request GTI loading */
> +		ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI);
> +	}
>  
>  	if (priv->chip_id != RCAR_GEN2) {
>  		ravb_parse_delay_mode(np, ndev);
[...]
> @@ -2377,13 +2404,15 @@ static int __maybe_unused ravb_resume(struct device *dev)
>  	/* Set AVB config mode */
>  	ravb_set_config_mode(ndev);
>  
> -	/* Set GTI value */
> -	ret = ravb_set_gti(ndev);
> -	if (ret)
> -		return ret;
> +	if (info->features & RAVB_PTP) {

   Not transparent enough again...

> +		/* Set GTI value */
> +		ret = ravb_set_gti(ndev);
> +		if (ret)
> +			return ret;
>  
> -	/* Request GTI loading */
> -	ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI);
> +		/* Request GTI loading */
> +		ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI);
> +	}
>  
>  	if (priv->chip_id != RCAR_GEN2)
>  		ravb_set_delay_mode(ndev);
> 

MBR, Sergei