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Wed, 14 Jul 2021 08:26:51 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m3aEB-00Cdnn-K8 for linux-arm-kernel@lists.infradead.org; Wed, 14 Jul 2021 08:26:48 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id B211B613AF; Wed, 14 Jul 2021 08:26:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1626251207; bh=etEuofD648HZ8+Qajl/tkZx7/aRwzO+o/d0lVwIk6pY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=joeWvwFalRc791zBVG4uATUst/eI5qgXrAKyNRrIlt6BX1tyB8+DOxWqBgkuAJCEa tnXo2SOEvZJmqVe8/icU4uQ544URv8579zGPUIRAZv5hpp4JP+ww0nzINRnpY6RBcN 2S4ttC65nPWuCjSxOwIH2ZgSlQEbaa+XQehZk6fG7TBbImtfHpm2zhMF8EkQ2+lPkd bQbFR7IqOvmqQ2CPIstQEc6dUtJ3CjMzxBqmS2FuYN3pat2+t+idVMauoNN+I8+mbB 12qGHeL9tUNRNsLwqDQM720l1jEIqN1KjBLVmvR3IYYm7RqOBVfrS8yfWyAq058Sq+ WmzbnBTycvAhg== Date: Wed, 14 Jul 2021 16:26:42 +0800 From: Shawn Guo To: Maxime Chevallier Cc: Russell King , Rob Herring , Andrew Lunn , 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-Disposition: inline In-Reply-To: <20210625121353.3698240-1-maxime.chevallier@bootlin.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210714_012647_719340_93856422 X-CRM114-Status: GOOD ( 12.68 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 > Tested-by: Herv=E9 Codina Applied, thanks. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel