From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12D58C07E9A for ; Wed, 14 Jul 2021 08:26:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F00F4613B0 for ; Wed, 14 Jul 2021 08:26:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238496AbhGNI3k (ORCPT ); Wed, 14 Jul 2021 04:29:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:37930 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238478AbhGNI3i (ORCPT ); Wed, 14 Jul 2021 04:29:38 -0400 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-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 List-ID: X-Mailing-List: devicetree@vger.kernel.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: Hervé Codina Applied, thanks.