linux-kernel - Re: Registering IRQ for MT7530 internal PHYs

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Date:   Mon, 18 Jan 2021 21:27:57 +0800
From:   Landen Chao <landen.chao@...iatek.com>
To:     DENG Qingfang <dqfext@...il.com>
CC:     Andrew Lunn <andrew@...n.ch>, Marc Zyngier <maz@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Russell King <linux@...linux.org.uk>,
        Sean Wang <Sean.Wang@...iatek.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Vivien Didelot" <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Weijie Gao (高惟杰) 
        <Weijie.Gao@...iatek.com>, Chuanhong Guo <gch981213@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        René van Dorst <opensource@...rst.com>
Subject: Re: Registering IRQ for MT7530 internal PHYs

Hi Qingfang,
On Wed, 2021-01-06 at 16:54 +0800, DENG Qingfang wrote:
> Hi Andrew,
> 
> On Wed, Dec 30, 2020 at 11:23 PM Andrew Lunn <andrew@...n.ch> wrote:
> >
> > On Wed, Dec 30, 2020 at 09:42:09AM +0000, Marc Zyngier wrote:
> > > > +static irqreturn_t
> > > > +mt7530_irq(int irq, void *data)
> > > > +{
> > > > +   struct mt7530_priv *priv = data;
> > > > +   bool handled = false;
> > > > +   int phy;
> > > > +   u32 val;
> > > > +
> > > > +   val = mt7530_read(priv, MT7530_SYS_INT_STS);
> > > > +   mt7530_write(priv, MT7530_SYS_INT_STS, val);
> > >
> > > If that is an ack operation, it should be dealt with as such in
> > > an irqchip callback instead of being open-coded here.
> >
> > Hi Qingfang
> >
> > Does the PHY itself have interrupt control and status registers?
> 
> MT7531's internal PHY has an interrupt status register, but I don't
> know if the same applies to MT7530.
Interrupt status/mask registers of MT7530 internal PHY is the same as
MT7531. The switch interrupt status register MT7530_SYS_INT_STS[14:8]
reflects internal PHY interrupt status. MT7530_SYS_INT_STS[6:0] we used
before does not related to internal PHY "interrupt".

However, base on MT753x hardware behavior, after read-clear interrupt
status of internal phy, we still need to write-clear
MT7530_SYS_INT_STS[14:8] to clear switch interrupt.

Landen
> 
> >
> > My experience with the Marvell Switch and its embedded PHYs is that
> > the PHYs are just the same as the discrete PHYs. There are bits to
> > enable different interrupts, and there are status bits indicating what
> > event caused the interrupt. Clearing the interrupt in the PHY clears
> > the interrupt in the switch interrupt controller. So in the mv88e6xxx
> > interrupt code, you see i do a read of the switch interrupt controller
> > status register, but i don't write to it as you have done.
> >
> >        Andrew