From patchwork Wed Apr 6 23:37:19 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suman Anna X-Patchwork-Id: 65221 Delivered-To: patch@linaro.org Received: by 10.112.199.169 with SMTP id jl9csp154474lbc; Wed, 6 Apr 2016 16:39:07 -0700 (PDT) X-Received: by 10.66.122.139 with SMTP id ls11mr105481pab.14.1459985946991; Wed, 06 Apr 2016 16:39:06 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id yo8si7485989pac.27.2016.04.06.16.39.06; Wed, 06 Apr 2016 16:39:06 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754935AbcDFXin (ORCPT + 29 others); Wed, 6 Apr 2016 19:38:43 -0400 Received: from comal.ext.ti.com ([198.47.26.152]:41845 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753481AbcDFXhq (ORCPT ); Wed, 6 Apr 2016 19:37:46 -0400 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id u36NbNPw026498; Wed, 6 Apr 2016 18:37:23 -0500 Received: from DLEE70.ent.ti.com (dlemailx.itg.ti.com [157.170.170.113]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id u36NbNQk016399; Wed, 6 Apr 2016 18:37:23 -0500 Received: from dflp32.itg.ti.com (10.64.6.15) by DLEE70.ent.ti.com (157.170.170.113) with Microsoft SMTP Server id 14.3.224.2; Wed, 6 Apr 2016 18:37:23 -0500 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id u36NbM67008549; Wed, 6 Apr 2016 18:37:22 -0500 Received: from localhost (irmo.am.dhcp.ti.com [128.247.83.68]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id u36NbM926348; Wed, 6 Apr 2016 18:37:22 -0500 (CDT) From: Suman Anna To: Jassi Brar CC: , , , Suman Anna Subject: [PATCH 3/4] mailbox/omap: check for any unread messages during suspend Date: Wed, 6 Apr 2016 18:37:19 -0500 Message-ID: <1459985840-1106-4-git-send-email-s-anna@ti.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1459985840-1106-1-git-send-email-s-anna@ti.com> References: <1459985840-1106-1-git-send-email-s-anna@ti.com> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The OMAP mailbox driver is used by clients to communicate with remote processors in general. The mailbox clients are expected to have stopped communicating with these remote processors during a system suspend. The OMAP mailbox fifos are expected to not have any messages as such. Add a check for any pending unprocessed messages in the suspend callback, to detect any communication protocol issues of the mailbox clients. The system suspend is aborted if any messages are found. Signed-off-by: Suman Anna --- drivers/mailbox/omap-mailbox.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) -- 2.7.4 diff --git a/drivers/mailbox/omap-mailbox.c b/drivers/mailbox/omap-mailbox.c index 1b90eb380d44..b61c6e8654b5 100644 --- a/drivers/mailbox/omap-mailbox.c +++ b/drivers/mailbox/omap-mailbox.c @@ -655,11 +655,19 @@ static const struct mbox_chan_ops omap_mbox_chan_ops = { static int omap_mbox_suspend(struct device *dev) { struct omap_mbox_device *mdev = dev_get_drvdata(dev); - u32 usr, reg; + u32 usr, fifo, reg; if (pm_runtime_status_suspended(dev)) return 0; + for (fifo = 0; fifo < mdev->num_fifos; fifo++) { + if (mbox_read_reg(mdev, MAILBOX_MSGSTATUS(fifo))) { + dev_err(mdev->dev, "fifo %d has unexpected unread messages\n", + fifo); + return -EBUSY; + } + } + for (usr = 0; usr < mdev->num_users; usr++) { reg = MAILBOX_IRQENABLE(mdev->intr_type, usr); mdev->irq_ctx[usr] = mbox_read_reg(mdev, reg);