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From: Andrew Lunn <andrew@lunn.ch>
To: Conor.Dooley@microchip.com
Cc: palmer@rivosinc.com, apatel@ventanamicro.com,
	netdev@vger.kernel.org, Nicolas.Ferre@microchip.com,
	Claudiu.Beznea@microchip.com, linux@armlinux.org.uk,
	hkallweit1@gmail.com, linux-riscv@lists.infradead.org
Subject: Re: riscv defconfig CONFIG_PM/macb/generic PHY regression in v5.18-rc1
Date: Tue, 5 Apr 2022 16:56:00 +0200	[thread overview]
Message-ID: <YkxYgDnWNxeXou3F@lunn.ch> (raw)
In-Reply-To: <9f4b057d-1985-5fd3-65c0-f944161c7792@microchip.com>

> Is this some sort of lack of support for CONFIG_PM=y in my clock driver,
> that's leading to the PHY getting stuck in reset?
> Or an interaction between CONFIG_PM=y & the macb/generic phy drivers?

What clock is driving the PHY? Sometimes the SoC outputs a clock to
the PHY, and the PHY will not work without it. Sometimes it is the
other way around, the PHY outputs a clock to SoC, so this might not be
your issue.

Maybe PM is turning the clock off because nothing is using it?

      Andrew

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WARNING: multiple messages have this Message-ID (diff)
From: Andrew Lunn <andrew@lunn.ch>
To: Conor.Dooley@microchip.com
Cc: palmer@rivosinc.com, apatel@ventanamicro.com,
	netdev@vger.kernel.org, Nicolas.Ferre@microchip.com,
	Claudiu.Beznea@microchip.com, linux@armlinux.org.uk,
	hkallweit1@gmail.com, linux-riscv@lists.infradead.org
Subject: Re: riscv defconfig CONFIG_PM/macb/generic PHY regression in v5.18-rc1
Date: Tue, 5 Apr 2022 16:56:00 +0200	[thread overview]
Message-ID: <YkxYgDnWNxeXou3F@lunn.ch> (raw)
In-Reply-To: <9f4b057d-1985-5fd3-65c0-f944161c7792@microchip.com>

> Is this some sort of lack of support for CONFIG_PM=y in my clock driver,
> that's leading to the PHY getting stuck in reset?
> Or an interaction between CONFIG_PM=y & the macb/generic phy drivers?

What clock is driving the PHY? Sometimes the SoC outputs a clock to
the PHY, and the PHY will not work without it. Sometimes it is the
other way around, the PHY outputs a clock to SoC, so this might not be
your issue.

Maybe PM is turning the clock off because nothing is using it?

      Andrew

  parent reply	other threads:[~2022-04-05 14:56 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-05 13:05 riscv defconfig CONFIG_PM/macb/generic PHY regression in v5.18-rc1 Conor.Dooley
2022-04-05 13:05 ` Conor.Dooley
2022-04-05 13:25 ` Andrew Lunn
2022-04-05 13:25   ` Andrew Lunn
2022-04-05 14:18   ` Conor.Dooley
2022-04-05 14:18     ` Conor.Dooley
2022-04-05 14:41     ` Conor.Dooley
2022-04-05 14:41       ` Conor.Dooley
2022-04-05 14:49     ` Andrew Lunn
2022-04-05 14:49       ` Andrew Lunn
2022-04-05 14:56 ` Andrew Lunn [this message]
2022-04-05 14:56   ` Andrew Lunn
2022-04-05 15:04 ` Andrew Lunn
2022-04-05 15:04   ` Andrew Lunn
2022-04-05 16:25   ` Conor Dooley
2022-04-05 16:25     ` Conor Dooley
2022-04-06  8:36   ` Conor.Dooley
2022-04-06  8:36     ` Conor.Dooley
2022-04-07 14:30     ` Conor.Dooley
2022-04-07 14:30       ` Conor.Dooley
2022-04-05 15:53 ` Russell King (Oracle)
2022-04-05 15:53   ` Russell King (Oracle)
2022-04-05 16:56   ` Palmer Dabbelt
2022-04-05 16:56     ` Palmer Dabbelt
2022-04-05 17:23     ` Conor Dooley
2022-04-05 17:23       ` Conor Dooley
2022-04-05 18:06       ` Andrew Lunn
2022-04-05 18:06         ` Andrew Lunn
2022-04-05 18:35         ` Conor Dooley
2022-04-05 18:35           ` Conor Dooley
2022-04-05 16:58   ` Conor Dooley
2022-04-05 16:58     ` Conor Dooley
2022-04-05 18:55     ` Russell King (Oracle)
2022-04-05 18:55       ` Russell King (Oracle)

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