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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 CAD82C3A5A0 for ; Mon, 20 Apr 2020 15:08:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B0C4720775 for ; Mon, 20 Apr 2020 15:08:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729555AbgDTPIH (ORCPT ); Mon, 20 Apr 2020 11:08:07 -0400 Received: from muru.com ([72.249.23.125]:50448 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726748AbgDTPIG (ORCPT ); Mon, 20 Apr 2020 11:08:06 -0400 Received: from atomide.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTPS id 3385F8027; Mon, 20 Apr 2020 15:08:53 +0000 (UTC) Date: Mon, 20 Apr 2020 08:08:02 -0700 From: Tony Lindgren To: "H. Nikolaus Schaller" Cc: Andreas Kemnade , Evgeniy Polyakov , Greg Kroah-Hartman , Linux Kernel Mailing List , linux-omap , Adam Ford , "Andrew F . Davis" , Vignesh R Subject: Re: [PATCHv3] w1: omap-hdq: Simplify driver with PM runtime autosuspend Message-ID: <20200420150802.GR37466@atomide.com> References: <20191217004048.46298-1-tony@atomide.com> <7B8C7DD9-095B-48FC-9642-695D07B79E97@goldelico.com> <20200416184638.GI37466@atomide.com> <3197C3F0-DEB9-4221-AFBD-4F2A08C84C4C@goldelico.com> <20200417164340.3d9043d1@aktux> <6430AF54-849E-456B-8DB0-B4478BBDB78D@goldelico.com> <20200417150721.GL37466@atomide.com> <8E062482-5D5D-4837-9980-D6C708DD24D4@goldelico.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8E062482-5D5D-4837-9980-D6C708DD24D4@goldelico.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * H. Nikolaus Schaller [200417 21:04]: > To me it looks as if reading hqd too quickly after omap_hdq_runtime_resume() > may be part of the problem, although it is 0.4 seconds between [ 18.355163] > and [ 18.745269]. So I am not sure about my interpretation. > > A different attempt for interpretation may be that trying to read the > slave triggers omap_hdq_runtime_resume() just before doing the > first hdq_read_byte(). Hmm so I wonder if adding msleep(100) at the end of omap_hdq_runtime_resume() might help? Regards, Tony