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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 17C1BC28CC0 for ; Wed, 29 May 2019 23:46:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E331E2437F for ; Wed, 29 May 2019 23:46:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726476AbfE2Xq4 (ORCPT ); Wed, 29 May 2019 19:46:56 -0400 Received: from mail-out.m-online.net ([212.18.0.9]:43334 "EHLO mail-out.m-online.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726311AbfE2Xq4 (ORCPT ); Wed, 29 May 2019 19:46:56 -0400 Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 45DnRv2lkZz1rC8L; Thu, 30 May 2019 01:46:51 +0200 (CEST) Received: from localhost (dynscan1.mnet-online.de [192.168.6.70]) by mail.m-online.net (Postfix) with ESMTP id 45DnRv1t9Pz1qqkk; Thu, 30 May 2019 01:46:51 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.70]) (amavisd-new, port 10024) with ESMTP id lJcG-9eLyu4F; Thu, 30 May 2019 01:46:50 +0200 (CEST) X-Auth-Info: 2NN+P8TcA3XW05IQxlk3qfAYe0WHEv4Qcg2/gfGOEfo= Received: from [IPv6:::1] (unknown [195.140.253.167]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPSA; Thu, 30 May 2019 01:46:50 +0200 (CEST) Subject: Re: [PATCH V2] net: phy: tja11xx: Add IRQ support to the driver To: Andrew Lunn Cc: Heiner Kallweit , netdev@vger.kernel.org, Florian Fainelli , Guenter Roeck , Jean Delvare , linux-hwmon@vger.kernel.org References: <20190528192324.28862-1-marex@denx.de> <96793717-a55c-7844-f7c0-cc357c774a19@gmail.com> <4f33b529-6c3c-07ee-6177-2d332de514c6@denx.de> <20190528195806.GV18059@lunn.ch> <15906cc0-3d8f-7810-27ed-d64bdbcfa7e7@denx.de> <20190528212252.GW18059@lunn.ch> <20190529232930.GF18059@lunn.ch> From: Marek Vasut Openpgp: preference=signencrypt Autocrypt: addr=marex@denx.de; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190529232930.GF18059@lunn.ch> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-hwmon-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org On 5/30/19 1:29 AM, Andrew Lunn wrote: > On Tue, May 28, 2019 at 11:33:33PM +0200, Marek Vasut wrote: >> On 5/28/19 11:22 PM, Andrew Lunn wrote: >>>> The link detection on the TJA1100 (not TJA1101) seems unstable at best, >>>> so I better use all the interrupt sources to nudge the PHY subsystem and >>>> have it check the link change. >>> >>> Then it sounds like you should just ignore interrupts and stay will >>> polling for the TJA1100. >> >> Polling for the link status change is slow(er) than the IRQ driven >> operation, so I would much rather use the interrupts. > > I agree about the speed, but it seems like interrupts on this PHY are > not so reliable. Polling always works. But unfortunately, you cannot > have both interrupts and polling to fix up problems when interrupts > fail. Your call, do you think interrupts really do work? It works fine for me this way. And mind you, it's only the TJA1100 that's flaky, the TJA1101 is better. > If you say that tja1101 works as expected, then please just use the > link up/down bits for it. I still don't know which bits really trigger link status changes, so I'd like to play it safe and just trigger on all of them. -- Best regards, Marek Vasut