Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Wed, 14 Jul 2021 16:26:42 +0800
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
Message-ID: <20210714082641.GL4419@dragon>
References: <20210625121353.3698240-1-maxime.chevallier@bootlin.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <20210625121353.3698240-1-maxime.chevallier@bootlin.com>
User-Agent: Mutt/1.9.4 (2018-02-28)
Precedence: bulk

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: Herv? Codina <herve.codina@bootlin.com>

Applied, thanks.