From: Shawn Guo <shawnguo@kernel.org>
To: Maxime Chevallier <maxime.chevallier@bootlin.com>
Cc: Russell King <linux@armlinux.org.uk>,
Rob Herring <robh+dt@kernel.org>, Andrew Lunn <andrew@lunn.ch>,
thomas.petazzoni@bootlin.com, herve.codina@bootlin.com,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] ARM: dts: imx6qdl-sr-som: Increase the PHY reset duration to 10ms
Date: Wed, 14 Jul 2021 16:26:42 +0800 [thread overview]
Message-ID: <20210714082641.GL4419@dragon> (raw)
In-Reply-To: <20210625121353.3698240-1-maxime.chevallier@bootlin.com>
On Fri, Jun 25, 2021 at 02:13:53PM +0200, Maxime Chevallier wrote:
> The AR803x PHY used on this modules seems to require the reset line to
> be asserted for around 10ms in order to avoid rare cases where the PHY
> gets stuck in an incoherent state that prevents it to function
> correctly.
>
> The previous value of 2ms was found to be problematic on some setups,
> causing intermittent issues where the PHY would be unresponsive
> every once in a while on some sytems, with a low occurrence (it typically
> took around 30 consecutive reboots to encounter the issue).
>
> Bumping the delay to the 10ms makes the issue dissapear, with more than
> 2500 consecutive reboots performed without the issue showing-up.
>
> Fixes: 208d7baf8085 ("ARM: imx: initial SolidRun HummingBoard support")
> Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
> Tested-by: Hervé Codina <herve.codina@bootlin.com>
Applied, thanks.
prev parent reply other threads:[~2021-07-14 8:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-25 12:13 [PATCH v2] ARM: dts: imx6qdl-sr-som: Increase the PHY reset duration to 10ms Maxime Chevallier
2021-06-25 12:29 ` Russell King (Oracle)
2021-07-14 8:26 ` Shawn Guo [this message]
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