linux-kernel - Re: [PATCH net-next 2/2] net: ethernet: ti: am65-cpsw: Enable USXGMII mode for J784S4 CPSW9G

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Date:   Fri, 31 Mar 2023 09:24:29 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Siddharth Vadapalli <s-vadapalli@...com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, rogerq@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        srk@...com
Subject: Re: [PATCH net-next 2/2] net: ethernet: ti: am65-cpsw: Enable
 USXGMII mode for J784S4 CPSW9G

On Fri, Mar 31, 2023 at 01:35:10PM +0530, Siddharth Vadapalli wrote:
> Hello Russell,
> 
> Thank you for reviewing the patch.
> 
> On 31/03/23 13:27, Russell King (Oracle) wrote:
> > On Fri, Mar 31, 2023 at 12:21:10PM +0530, Siddharth Vadapalli wrote:
> >> TI's J784S4 SoC supports USXGMII mode. Add USXGMII mode to the
> >> extra_modes member of the J784S4 SoC data. Additionally, configure the
> >> MAC Control register for supporting USXGMII mode. Also, for USXGMII
> >> mode, include MAC_5000FD in the "mac_capabilities" member of struct
> >> "phylink_config".
> > 
> > I don't think TI "get" phylink at all...
> > 
> >> diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> >> index 4b4d06199b45..ab33e6fe5b1a 100644
> >> --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> >> +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> >> @@ -1555,6 +1555,8 @@ static void am65_cpsw_nuss_mac_link_up(struct phylink_config *config, struct phy
> >>  		mac_control |= CPSW_SL_CTL_GIG;
> >>  	if (interface == PHY_INTERFACE_MODE_SGMII)
> >>  		mac_control |= CPSW_SL_CTL_EXT_EN;
> >> +	if (interface == PHY_INTERFACE_MODE_USXGMII)
> >> +		mac_control |= CPSW_SL_CTL_XGIG | CPSW_SL_CTL_XGMII_EN;
> > 
> > The configuration of the interface mode should *not* happen in
> > mac_link_up(), but should happen in e.g. mac_config().
> 
> I will move all the interface mode associated configurations to mac_config() in
> the v2 series.

Looking at the whole of mac_link_up(), could you please describe what
effect these bits are having:

	CPSW_SL_CTL_GIG
	CPSW_SL_CTL_EXT_EN
	CPSW_SL_CTL_IFCTL_A

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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