netdev - Re: [PATCH net-next v2 04/19] net: phy: at803x: implement generic .handle

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Date:   Wed, 4 Nov 2020 19:09:19 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Ioana Ciornei <ciorneiioana@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Ioana Ciornei <ioana.ciornei@....com>,
        Michael Walle <michael@...le.cc>
Subject: Re: [PATCH net-next v2 04/19] net: phy: at803x: implement generic
 .handle_interrupt() callback

On Sun, Nov 01, 2020 at 02:50:59PM +0200, Ioana Ciornei wrote:
> From: Ioana Ciornei <ioana.ciornei@....com>
> 
> In an attempt to actually support shared IRQs in phylib, we now move the
> responsibility of triggering the phylib state machine or just returning
> IRQ_NONE, based on the IRQ status register, to the PHY driver. Having
> 3 different IRQ handling callbacks (.handle_interrupt(),
> .did_interrupt() and .ack_interrupt() ) is confusing so let the PHY
> driver implement directly an IRQ handler like any other device driver.
> Make this driver follow the new convention.
> 
> Cc: Oleksij Rempel <o.rempel@...gutronix.de>
> Cc: Michael Walle <michael@...le.cc>
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>

Tested-by: Oleksij Rempel <o.rempel@...gutronix.de>

> ---
> Changes in v2:
>  - adjust .handle_interrupt() so that we only take into account the
>    enabled IRQs.
> 
>  drivers/net/phy/at803x.c | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> index ed601a7e46a0..c7f91934cf82 100644
> --- a/drivers/net/phy/at803x.c
> +++ b/drivers/net/phy/at803x.c
> @@ -628,6 +628,32 @@ static int at803x_config_intr(struct phy_device *phydev)
>  	return err;
>  }
>  
> +static irqreturn_t at803x_handle_interrupt(struct phy_device *phydev)
> +{
> +	int irq_status, int_enabled;
> +
> +	irq_status = phy_read(phydev, AT803X_INTR_STATUS);
> +	if (irq_status < 0) {
> +		phy_error(phydev);
> +		return IRQ_NONE;
> +	}
> +
> +	/* Read the current enabled interrupts */
> +	int_enabled = phy_read(phydev, AT803X_INTR_ENABLE);
> +	if (int_enabled < 0) {
> +		phy_error(phydev);
> +		return IRQ_NONE;
> +	}
> +
> +	/* See if this was one of our enabled interrupts */
> +	if (!(irq_status & int_enabled))
> +		return IRQ_NONE;
> +
> +	phy_trigger_machine(phydev);
> +
> +	return IRQ_HANDLED;
> +}
> +
>  static void at803x_link_change_notify(struct phy_device *phydev)
>  {
>  	/*
> @@ -1064,6 +1090,7 @@ static struct phy_driver at803x_driver[] = {
>  	.read_status		= at803x_read_status,
>  	.ack_interrupt		= at803x_ack_interrupt,
>  	.config_intr		= at803x_config_intr,
> +	.handle_interrupt	= at803x_handle_interrupt,
>  	.get_tunable		= at803x_get_tunable,
>  	.set_tunable		= at803x_set_tunable,
>  	.cable_test_start	= at803x_cable_test_start,
> @@ -1084,6 +1111,7 @@ static struct phy_driver at803x_driver[] = {
>  	/* PHY_BASIC_FEATURES */
>  	.ack_interrupt		= at803x_ack_interrupt,
>  	.config_intr		= at803x_config_intr,
> +	.handle_interrupt	= at803x_handle_interrupt,
>  }, {
>  	/* Qualcomm Atheros AR8031/AR8033 */
>  	PHY_ID_MATCH_EXACT(ATH8031_PHY_ID),
> @@ -1102,6 +1130,7 @@ static struct phy_driver at803x_driver[] = {
>  	.aneg_done		= at803x_aneg_done,
>  	.ack_interrupt		= &at803x_ack_interrupt,
>  	.config_intr		= &at803x_config_intr,
> +	.handle_interrupt	= at803x_handle_interrupt,
>  	.get_tunable		= at803x_get_tunable,
>  	.set_tunable		= at803x_set_tunable,
>  	.cable_test_start	= at803x_cable_test_start,
> @@ -1122,6 +1151,7 @@ static struct phy_driver at803x_driver[] = {
>  	/* PHY_BASIC_FEATURES */
>  	.ack_interrupt		= at803x_ack_interrupt,
>  	.config_intr		= at803x_config_intr,
> +	.handle_interrupt	= at803x_handle_interrupt,
>  	.cable_test_start	= at803x_cable_test_start,
>  	.cable_test_get_status	= at803x_cable_test_get_status,
>  }, {
> @@ -1134,6 +1164,7 @@ static struct phy_driver at803x_driver[] = {
>  	/* PHY_BASIC_FEATURES */
>  	.ack_interrupt		= &at803x_ack_interrupt,
>  	.config_intr		= &at803x_config_intr,
> +	.handle_interrupt	= at803x_handle_interrupt,
>  	.cable_test_start	= at803x_cable_test_start,
>  	.cable_test_get_status	= at803x_cable_test_get_status,
>  	.read_status		= at803x_read_status,
> -- 
> 2.28.0
> 
> 

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