linux-kernel - Re: [PATCH net-next V3] net: pcs: xpcs: Add 2500BASE-X case in get state for XPCS drivers

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Message-ID: <ghpmbmfjps24x7xvojk4gbkl55wjcuufd4v6mz6ws5htv35g2b@ugqsbet7t73p>
Date:   Fri, 27 Oct 2023 14:04:15 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
Cc:     Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        davem@...emloft.net, kuba@...nel.org, linux-kernel@...r.kernel.org,
        andrew@...n.ch, Jose.Abreu@...opsys.com,
        UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next V3] net: pcs: xpcs: Add 2500BASE-X case in get
 state for XPCS drivers

Cc += Russell

* It's a good practice to add all the reviewers to Cc in the new patch
* revisions.

On Fri, Oct 27, 2023 at 10:13:06AM +0530, Raju Lakkaraju wrote:
> Add DW_2500BASEX case in xpcs_get_state( ) to update speed, duplex and pause
> 
> Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>

With a nitpick below clarified, feel free to add:
Reviewed-by: Serge Semin <fancer.lancer@...il.com>

> ---
>  drivers/net/pcs/pcs-xpcs.c | 29 +++++++++++++++++++++++++++++
>  drivers/net/pcs/pcs-xpcs.h |  2 ++
>  2 files changed, 31 insertions(+)
> 
> diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
> index 4dbc21f604f2..31f0beba638a 100644
> --- a/drivers/net/pcs/pcs-xpcs.c
> +++ b/drivers/net/pcs/pcs-xpcs.c
> @@ -1090,6 +1090,28 @@ static int xpcs_get_state_c37_1000basex(struct dw_xpcs *xpcs,
>  	return 0;
>  }
>  
> +static int xpcs_get_state_2500basex(struct dw_xpcs *xpcs,
> +				    struct phylink_link_state *state)
> +{
> +	int ret;
> +
> +	ret = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_STS);
> +	if (ret < 0) {
> +		state->link = 0;
> +		return ret;
> +	}
> +
> +	state->link = !!(ret & DW_VR_MII_MMD_STS_LINK_STS);
> +	if (!state->link)
> +		return 0;
> +
> +	state->speed = SPEED_2500;

> +	state->pause |= MLO_PAUSE_TX | MLO_PAUSE_RX;

Why is it '|=' instead of just '='? Is it possible to have the 'pause'
field having some additional flags set which would be required to
preserve?

-Serge(y)

> +	state->duplex = DUPLEX_FULL;
> +
> +	return 0;
> +}
> +
>  static void xpcs_get_state(struct phylink_pcs *pcs,
>  			   struct phylink_link_state *state)
>  {
> @@ -1127,6 +1149,13 @@ static void xpcs_get_state(struct phylink_pcs *pcs,
>  			       ERR_PTR(ret));
>  		}
>  		break;
> +	case DW_2500BASEX:
> +		ret = xpcs_get_state_2500basex(xpcs, state);
> +		if (ret) {
> +			pr_err("xpcs_get_state_2500basex returned %pe\n",
> +			       ERR_PTR(ret));
> +		}
> +		break;
>  	default:
>  		return;
>  	}
> diff --git a/drivers/net/pcs/pcs-xpcs.h b/drivers/net/pcs/pcs-xpcs.h
> index 39a90417e535..96c36b32ca99 100644
> --- a/drivers/net/pcs/pcs-xpcs.h
> +++ b/drivers/net/pcs/pcs-xpcs.h
> @@ -55,6 +55,8 @@
>  /* Clause 37 Defines */
>  /* VR MII MMD registers offsets */
>  #define DW_VR_MII_MMD_CTRL		0x0000
> +#define DW_VR_MII_MMD_STS		0x0001
> +#define DW_VR_MII_MMD_STS_LINK_STS	BIT(2)
>  #define DW_VR_MII_DIG_CTRL1		0x8000
>  #define DW_VR_MII_AN_CTRL		0x8001
>  #define DW_VR_MII_AN_INTR_STS		0x8002
> -- 
> 2.34.1
>