From patchwork Wed Feb 10 23:02:49 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 8275351 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 1BDD59F8AA for ; Wed, 10 Feb 2016 23:03:16 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2F82420377 for ; Wed, 10 Feb 2016 23:03:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 42A842037E for ; Wed, 10 Feb 2016 23:03:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752575AbcBJXDM (ORCPT ); Wed, 10 Feb 2016 18:03:12 -0500 Received: from muru.com ([72.249.23.125]:33457 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751965AbcBJXDK (ORCPT ); Wed, 10 Feb 2016 18:03:10 -0500 Received: from muffinssi.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 6D95185A9; Wed, 10 Feb 2016 23:04:19 +0000 (UTC) From: Tony Lindgren To: linux-omap@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, Alan Stern , Kevin Hilman , Nishanth Menon , "Rafael J . Wysocki" , Ulf Hansson , Tero Kristo , Greg Kroah-Hartman , linux-i2c@vger.kernel.org, linux-mmc@vger.kernel.org, linux-serial@vger.kernel.org, linux-spi@vger.kernel.org, Mark Brown , Peter Hurley , Wolfram Sang Subject: [PATCH 6/7] ARM: OMAP2+: Improve omap_device error for driver writers Date: Wed, 10 Feb 2016 15:02:49 -0800 Message-Id: <1455145370-20301-7-git-send-email-tony@atomide.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1455145370-20301-1-git-send-email-tony@atomide.com> References: <1455145370-20301-1-git-send-email-tony@atomide.com> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Drivers using pm_runtime_use_autosuspend() may not get disabled after -EPROBE_DEFER. On the following device driver probe, hardware state is different from the PM runtime state causing omap_device to produce the following error: omap_device_enable() called from invalid state 1 And with omap_device and omap hardware being picky for PM, this will block any deeper idle states in hardware. Let's add a proper error message so driver writers can easily fix their drivers for PM. In general, the solution is to fix the drivers to follow the PM runtime documentation: 1. For sections of code that needs the device disabled, use pm_runtime_put_sync_suspend() if pm_runtime_set_autosuspend() has been set. 2. For driver exit code, use pm_runtime_dont_use_autosuspend() before pm_runtime_put_sync() if pm_runtime_use_autosuspend() has been set. Let's not return with 0 from _od_runtime_resume() as that will eventually lead into new drivers with broken PM runtime that will block deeper idle states on omaps. Cc: Alan Stern Cc: Kevin Hilman Cc: Nishanth Menon Cc: Rafael J. Wysocki Cc: Ulf Hansson Cc: Tero Kristo Signed-off-by: Tony Lindgren Acked-by: Kevin Hilman Acked-by: Ulf Hansson --- arch/arm/mach-omap2/omap_device.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c index 0437537..ebd8369 100644 --- a/arch/arm/mach-omap2/omap_device.c +++ b/arch/arm/mach-omap2/omap_device.c @@ -602,8 +602,10 @@ static int _od_runtime_resume(struct device *dev) int ret; ret = omap_device_enable(pdev); - if (ret) + if (ret) { + dev_err(dev, "use pm_runtime_put_sync_suspend() in driver?\n"); return ret; + } return pm_generic_runtime_resume(dev); }