netdev - Re: [PATCH net-next v5 4/5] net: phy: mediatek: Extend 1G TX/RX link pulse time

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Date: Mon, 3 Jun 2024 11:51:07 +0000
From: SkyLake Huang (黃啟澤)
	<SkyLake.Huang@...iatek.com>
To: "linux@...linux.org.uk" <linux@...linux.org.uk>
CC: "andrew@...n.ch" <andrew@...n.ch>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>, "kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>, "edumazet@...gle.com"
	<edumazet@...gle.com>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "dqfext@...il.com" <dqfext@...il.com>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	Steven Liu (劉人豪) <steven.liu@...iatek.com>,
	"davem@...emloft.net" <davem@...emloft.net>, "hkallweit1@...il.com"
	<hkallweit1@...il.com>, "angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>, "daniel@...rotopia.org"
	<daniel@...rotopia.org>
Subject: Re: [PATCH net-next v5 4/5] net: phy: mediatek: Extend 1G TX/RX link
 pulse time

On Mon, 2024-06-03 at 09:06 +0100, Russell King (Oracle) wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  On Mon, Jun 03, 2024 at 03:15:36AM +0000, SkyLake Huang (黃啟澤) wrote:
> > On Thu, 2024-05-30 at 17:10 +0100, Russell King (Oracle) wrote:
> > >   
> > > External email : Please do not click links or open attachments
> until
> > > you have verified the sender or the content.
> > >  On Thu, May 30, 2024 at 04:01:08PM +0000, SkyLake Huang (黃啟澤)
> wrote:
> > > > I'm not going to handle timeout case here. If we can't detect
> > > > MTK_PHY_FINAL_SPEED_1000 in 1 second, let it go and we'll
> detect it
> > > > next round.
> > > 
> > > With this waiting up to one second for MTK_PHY_FINAL_SPEED_1000
> to be
> > > set...
> > > 
> > > > > > +int mtk_gphy_cl22_read_status(struct phy_device *phydev)
> > > > > > +{
> > > > > > +int ret;
> > > > > > +
> > > > > > +ret = genphy_read_status(phydev);
> > > > > > +if (ret)
> > > > > > +return ret;
> > > > > > +
> > > > > > +if (phydev->autoneg == AUTONEG_ENABLE && !phydev-
> > > > > >autoneg_complete) {
> > > 
> > > Are you sure you want this condition like this? When the link is
> > > down,
> > > and 1G speeds are being advertised, it means that you'll call
> > > extend_an_new_lp_cnt_limit(). If MTK_PHY_FINAL_SPEED_1000 doesn't
> get
> > > set, that'll take one second each and every time we poll the PHY
> for
> > > its status - which will be done while holding phydev->lock.
> > > 
> > > This doesn't sound very good.
> > > 
> > > -- 
> > > RMK's Patch system: 
> https://www.armlinux.org.uk/developer/patches/
> > > FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
> > 
> > I add another condition to make sure we enter
> > extend_an_new_lp_cnt_limit() only in first few seconds when we plug
> in
> > cable.
> > 
> > It will look like this:
> > ===============================================================
> > #define MTK_PHY_AUX_CTRL_AND_STATUS0x14
> > #define   MTK_PHY_LP_DETECTED_MASKGENMASK(7, 6)
> > 
> > if (phydev->autoneg == AUTONEG_ENABLE && !phydev->autoneg_complete) 
> {
> > phy_select_page(phydev, MTK_PHY_PAGE_EXTENDED_1);
> > ret = __phy_read(phydev, MTK_PHY_AUX_CTRL_AND_STATUS);
> > phy_restore_page(phydev, MTK_PHY_PAGE_STANDARD, 0);
> 
> We provide a helper for this:
> 
> ret = phy_read_paged(phydev, MTK_PHY_PAGE_EXTENDED_1,
>      MTK_PHY_AUX_CTRL_AND_STATUS);
> 
> but please check "ret" for errors.
> 
> -- 
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

OK, I'll fix this in v6.

Sky