linux-kernel - Re: [PATCH net] phy: dp83869: fix interrupts issue when using with an optical fiber sfp. to correctly clear the interrupts both status registers must be read.

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Message-ID: <20250726200538.GO1367887@horms.kernel.org>
Date: Sat, 26 Jul 2025 21:05:38 +0100
From: Simon Horman <horms@...nel.org>
To: chalianis1@...il.com
Cc: andrew@...n.ch, hkallweit1@...il.com, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, linux@...linux.org.uk,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH net] phy: dp83869: fix interrupts issue when using with
 an optical fiber sfp. to correctly clear the interrupts both status
 registers must be read.

On Fri, Jul 25, 2025 at 08:10:34PM -0400, chalianis1@...il.com wrote:
> From: Anis Chali <chalianis1@...il.com>
> 
> from datasheet of dp83869hm
> 7.3.6 Interrupt
> The DP83869HM can be configured to generate an interrupt when changes of internal status occur. The interrupt
> allows a MAC to act upon the status in the PHY without polling the PHY registers. The interrupt source can be
> selected through the interrupt registers, MICR (12h) and FIBER_INT_EN (C18h). The interrupt status can be
> read from ISR (13h) and FIBER_INT_STTS (C19h) registers. Some interrupts are enabled by default and can
> be disabled through register access. Both the interrupt status registers must be read in order to clear pending
> interrupts. Until the pending interrupts are cleared, new interrupts may not be routed to the interrupt pin.
> 
> Fixes: 01db923e8377 ("net: phy: dp83869: Add TI dp83869 phy")
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Anis Chali <chalianis1@...il.com>
> ---
>  drivers/net/phy/dp83869.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/net/phy/dp83869.c b/drivers/net/phy/dp83869.c
> index a62cd838a9ea..1e8c20f387b8 100644
> --- a/drivers/net/phy/dp83869.c
> +++ b/drivers/net/phy/dp83869.c
> @@ -41,6 +41,7 @@
>  #define DP83869_IO_MUX_CFG	0x0170
>  #define DP83869_OP_MODE		0x01df
>  #define DP83869_FX_CTRL		0x0c00
> +#define DP83869_FX_INT_STS		0x0c19
>  
>  #define DP83869_SW_RESET	BIT(15)
>  #define DP83869_SW_RESTART	BIT(14)
> @@ -195,6 +196,12 @@ static int dp83869_ack_interrupt(struct phy_device *phydev)
>  	if (err < 0)
>  		return err;
>  
> +	if (linkmode_test_bit(ETHTOOL_LINK_MODE_FIBRE_BIT, phydev->supported)) {
> +		err = phy_read_mmd(phydev, DP83869_DEVADDR, DP83869_FX_INT_STS);
> +		if (err < 0)
> +			return err;		

Hi Anis,

Its invisible, of course, but the line above has trailing whitespace.

Flagged by checkpatch.

> +	}
> +
>  	return 0;
>  }
>  
> -- 
> 2.49.0
> 
>