From patchwork Sat Oct 2 11:54:13 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ohad Ben Cohen X-Patchwork-Id: 226771 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id o92BvcCr020366 for ; Sat, 2 Oct 2010 11:57:43 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755328Ab0JBL5h (ORCPT ); Sat, 2 Oct 2010 07:57:37 -0400 Received: from mail-fx0-f46.google.com ([209.85.161.46]:48776 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754002Ab0JBL5g (ORCPT ); Sat, 2 Oct 2010 07:57:36 -0400 Received: by mail-fx0-f46.google.com with SMTP id 14so1071583fxm.19 for ; Sat, 02 Oct 2010 04:57:36 -0700 (PDT) Received: by 10.223.56.4 with SMTP id w4mr6486902fag.91.1286020655832; Sat, 02 Oct 2010 04:57:35 -0700 (PDT) Received: from localhost.localdomain (46-116-86-31.bb.netvision.net.il [46.116.86.31]) by mx.google.com with ESMTPS id j14sm1159450faa.23.2010.10.02.04.57.33 (version=TLSv1/SSLv3 cipher=RC4-MD5); Sat, 02 Oct 2010 04:57:35 -0700 (PDT) From: Ohad Ben-Cohen To: , Cc: Chris Ball , Nicolas Pitre , Luciano Coelho , Ohad Ben-Cohen Subject: [PATCH v2 09/11] sdio: support suspend/resume while runtime suspended Date: Sat, 2 Oct 2010 13:54:13 +0200 Message-Id: <1286020455-28946-10-git-send-email-ohad@wizery.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1286020455-28946-1-git-send-email-ohad@wizery.com> References: <1286020455-28946-1-git-send-email-ohad@wizery.com> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Sat, 02 Oct 2010 11:57:43 +0000 (UTC) diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c index 3637483..2716c7a 100644 --- a/drivers/mmc/core/sdio_bus.c +++ b/drivers/mmc/core/sdio_bus.c @@ -189,12 +189,41 @@ out: #ifdef CONFIG_PM_RUNTIME +static int sdio_bus_pm_prepare(struct device *dev) +{ + /* + * Resume an SDIO device which was suspended at run time at this + * point, in order to allow standard SDIO suspend/resume paths + * to keep working as usual. + * + * Ultimately, the SDIO driver itself will decide (in its + * suspend handler, or lack thereof) whether the card should be + * removed or kept, and if kept, at what power state. + * + * At this point, PM core have increased our use count, so it's + * safe to directly resume the device. After system is resumed + * again, PM core will drop back its runtime PM use count, and if + * needed device will be suspended again. + * + * The end result is guaranteed to be a power state that is + * coherent with the device's runtime PM use count. + * + * The return value of pm_runtime_resume is deliberately unchecked + * since there is little point in failing system suspend if a + * device can't be resumed. + */ + pm_runtime_resume(dev); + + return 0; +} + static const struct dev_pm_ops sdio_bus_pm_ops = { SET_RUNTIME_PM_OPS( pm_generic_runtime_suspend, pm_generic_runtime_resume, pm_generic_runtime_idle ) + .prepare = sdio_bus_pm_prepare, }; #define SDIO_PM_OPS_PTR (&sdio_bus_pm_ops)