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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 8337DC433DF for ; Thu, 30 Jul 2020 08:59:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A854206E6 for ; Thu, 30 Jul 2020 08:59:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728904AbgG3I7f (ORCPT ); Thu, 30 Jul 2020 04:59:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60772 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726287AbgG3I7e (ORCPT ); Thu, 30 Jul 2020 04:59:34 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 90F71C061794 for ; Thu, 30 Jul 2020 01:59:34 -0700 (PDT) Received: from pty.hi.pengutronix.de ([2001:67c:670:100:1d::c5]) by metis.ext.pengutronix.de with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1k14PQ-0002tp-I6; Thu, 30 Jul 2020 10:59:28 +0200 Received: from mfe by pty.hi.pengutronix.de with local (Exim 4.89) (envelope-from ) id 1k14PQ-0003bj-0G; Thu, 30 Jul 2020 10:59:28 +0200 Date: Thu, 30 Jul 2020 10:59:27 +0200 From: Marco Felsch To: Dmitry Torokhov Cc: Horia =?utf-8?Q?Geant=C4=83?= , Herbert Xu , "David S. Miller" , Rob Herring , Shawn Guo , =?iso-8859-1?Q?Andr=E9?= Draszik , Robin Gong , Anson Huang , Fabio Estevam , Aymen Sghaier , Adam Ford , linux-input@vger.kernel.org, linux-crypto@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, NXP Linux Team Subject: Re: [PATCH v3 3/3] Input: snvs_pwrkey - only IRQ_HANDLED for our own events Message-ID: <20200730085927.ro3c2ptiixi2ikyf@pengutronix.de> References: <20200723074314.3304-1-horia.geanta@nxp.com> <20200723074314.3304-4-horia.geanta@nxp.com> <20200729075513.ckjnhfv3dxuesvsi@pengutronix.de> <20200730060601.GE1665100@dtor-ws> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20200730060601.GE1665100@dtor-ws> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-IRC: #ptxdist @freenode X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-Uptime: 10:56:41 up 258 days, 15 min, 251 users, load average: 0.05, 0.08, 0.08 User-Agent: NeoMutt/20170113 (1.7.2) X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::c5 X-SA-Exim-Mail-From: mfe@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-input@vger.kernel.org Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Hi Dmitry, On 20-07-29 23:06, Dmitry Torokhov wrote: > Hi Marco, > > On Wed, Jul 29, 2020 at 09:55:13AM +0200, Marco Felsch wrote: > > Hi, > > > > On 20-07-23 10:43, Horia Geantă wrote: > > > From: André Draszik > > > > > > The snvs_pwrkey shares the SNVS LPSR status register with the snvs_rtc. > > > > > > This driver here should only return IRQ_HANDLED if the status register > > > indicates that the event we're handling in the irq handler was genuinely > > > intended for this driver. Otheriwse the interrupt subsystem will > > > assume the interrupt was handled successfully even though it wasn't > > > at all. > > > > After checking the RM and the imx6qdl.dtsi I'm not very sure that this > > is right since the snvs-powerkey has a seperate irq-line. So we can be > > sure that this irq is for us. If this is the case we don't need to check > > the SNVS_LPSR_REG instead we only need to clear it. > > Wouldn't we want to know if for some reason we get spurious interrupts? We could check the bit at the very begin of the IRQ and return early but according the RM this should never happen. Anyway you're right HW is never bug free. Regards, Marco > Thanks. > > -- > Dmitry