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

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Message-ID: <fa7951e1-4a98-8488-d724-3eda9b97e376@gmail.com>
Date:   Wed, 30 Dec 2020 10:12:03 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     DENG Qingfang <dqfext@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Landen Chao <Landen.Chao@...iatek.com>,
        Marc Zyngier <maz@...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, netdev <netdev@...r.kernel.org>,
        Weijie Gao <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

On 30.12.2020 10:07, DENG Qingfang wrote:
> Hi Heiner,
> Thanks for your reply.
> 
> On Wed, Dec 30, 2020 at 3:39 PM Heiner Kallweit <hkallweit1@...il.com> wrote:
>> I don't think that's the best option.
> 
> I'm well aware of that.
> 
>> You may want to add a PHY driver for your chip. Supposedly it
>> supports at least PHY suspend/resume. You can use the RTL8366RB
>> PHY driver as template.
> 
> There's no MediaTek PHY driver yet. Do we really need a new one just
> for the interrupts?
> 
Not only for the interrupts. The genphy driver e.g. doesn't support
PHY suspend/resume. And the PHY driver needs basically no code,
just set the proper callbacks.

>>> +     dev_info_ratelimited(priv->dev, "interrupt status: 0x%08x\n", val);
>>> +     dev_info_ratelimited(priv->dev, "interrupt enable: 0x%08x\n", mt7530_read(priv, MT7530_SYS_INT_EN));
>>> +
>> This is debug code to be removed in the final version?
> 
> Yes.
> 
>>> +     for (phy = 0; phy < MT7530_NUM_PHYS; phy++) {
>>> +             if (val & BIT(phy)) {
>>> +                     unsigned int child_irq;
>>> +
>>> +                     child_irq = irq_find_mapping(priv->irq_domain, phy);
>>> +                     handle_nested_irq(child_irq);
>>> +                     handled = true;
>>> +             }
>>> +     }
>>> +
>>> +     return handled ? IRQ_HANDLED : IRQ_NONE;
>>
>> IRQ_RETVAL() could be used here.
> 
> Good to know :)
> 
>>
>>> +}
>>> +
>>> +static void mt7530_irq_mask(struct irq_data *d)
>>> +{
>>> +     struct mt7530_priv *priv = irq_data_get_irq_chip_data(d);
>>> +
>>> +     priv->irq_enable &= ~BIT(d->hwirq);
>>
>> Here you don't actually do something. HW doesn't support masking
>> interrupt generation for a port?
> 
> priv->irq_enable will be written to MT7530_SYS_INT_EN in
> mt7530_irq_bus_sync_unlock. You can think of it as an inverted mask.
>