netdev - RE: [PATCH 3/4] net: phy: aquantia: Poll for TX ready at PHY system side

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Message-ID:
 <BL3PR12MB64504E3A40CD6D8EAB7FF0C8C302A@BL3PR12MB6450.namprd12.prod.outlook.com>
Date: Mon, 24 Jul 2023 11:29:33 +0000
From: Revanth Kumar Uppala <ruppala@...dia.com>
To: Russell King <linux@...linux.org.uk>
CC: "andrew@...n.ch" <andrew@...n.ch>, "hkallweit1@...il.com"
	<hkallweit1@...il.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: RE: [PATCH 3/4] net: phy: aquantia: Poll for TX ready at PHY system
 side



> -----Original Message-----
> From: Russell King <linux@...linux.org.uk>
> Sent: Wednesday, June 28, 2023 7:04 PM
> To: Revanth Kumar Uppala <ruppala@...dia.com>
> Cc: andrew@...n.ch; hkallweit1@...il.com; netdev@...r.kernel.org; linux-
> tegra@...r.kernel.org
> Subject: Re: [PATCH 3/4] net: phy: aquantia: Poll for TX ready at PHY system side
> 
> External email: Use caution opening links or attachments
> 
> 
> On Wed, Jun 28, 2023 at 06:13:25PM +0530, Revanth Kumar Uppala wrote:
> > +     /* Lane bring-up failures are seen during interface up, as interface
> > +      * speed settings are configured while the PHY is still initializing.
> > +      * To resolve this, poll until PHY system side interface gets ready
> > +      * and the interface speed settings are configured.
> > +      */
> > +     ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_PHYXS,
> MDIO_PHYXS_VEND_IF_STATUS,
> > +                                     val, (val & MDIO_PHYXS_VEND_IF_STATUS_TX_READY),
> > +                                     20000, 2000000, false);
> 
> What does this actually mean when the condition succeeds? Does it mean that
> the system interface is now fully configured (but may or may not have link)?
Yes, your understanding is correct.
It means that the system interface is now fully configured and has the link.
> 
> If that's correct, then that's fine. If it doesn't succeed because the system
> interface doesn't have link, then that would be very bad, because _this_ function
> needs to return so the MAC side can then be configured to gain link with the PHY
> with the appropriate link parameters.
> 
> The comment doesn't make it clear which it is.
I will add the comment more clearly in V2 series.
> 
> Thanks.
> 
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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