From patchwork Thu Feb 2 03:30:19 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bin Liu X-Patchwork-Id: 93088 Delivered-To: patch@linaro.org Received: by 10.140.20.99 with SMTP id 90csp2721374qgi; Wed, 1 Feb 2017 19:30:49 -0800 (PST) X-Received: by 10.98.25.21 with SMTP id 21mr7953723pfz.46.1486006249480; Wed, 01 Feb 2017 19:30:49 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id m83si20959482pfa.102.2017.02.01.19.30.49; Wed, 01 Feb 2017 19:30:49 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-usb-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-usb-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-usb-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=ti.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751000AbdBBDar (ORCPT + 4 others); Wed, 1 Feb 2017 22:30:47 -0500 Received: from lelnx193.ext.ti.com ([198.47.27.77]:34049 "EHLO lelnx193.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750973AbdBBDaq (ORCPT ); Wed, 1 Feb 2017 22:30:46 -0500 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by lelnx193.ext.ti.com (8.15.1/8.15.1) with ESMTP id v123UjJe026696; Wed, 1 Feb 2017 21:30:45 -0600 Received: from DFLE72.ent.ti.com (dfle72.ent.ti.com [128.247.5.109]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id v123Ujhh009611; Wed, 1 Feb 2017 21:30:45 -0600 Received: from dflp33.itg.ti.com (10.64.6.16) by DFLE72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.3.294.0; Wed, 1 Feb 2017 21:30:45 -0600 Received: from dbdmail01.india.ti.com (dbdmail01.india.ti.com [172.24.162.206]) by dflp33.itg.ti.com (8.14.3/8.13.8) with ESMTP id v123UiK8022010; Wed, 1 Feb 2017 21:30:45 -0600 Received: from uda0271908.am.dhcp.ti.com (uda0271908.am.dhcp.ti.com [128.247.83.228]) by dbdmail01.india.ti.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id v123UTg0032465; Thu, 2 Feb 2017 09:00:42 +0530 From: Bin Liu To: Greg KH CC: Subject: [PATCH 08/17] usb: musb: Add a quirk to preserve the session during suspend Date: Wed, 1 Feb 2017 21:30:19 -0600 Message-ID: <1486006228-10062-9-git-send-email-b-liu@ti.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1486006228-10062-1-git-send-email-b-liu@ti.com> References: <1486006228-10062-1-git-send-email-b-liu@ti.com> MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Alexandre Bailon On da8xx, VBUS is not maintained during suspend when musb is in host mode. On resume, all the connected devices will be disconnected and then will be enumerated again. This happens because MUSB_DEVCTL is cleared during suspend. Add a quirk to not clear MUSB_DEVCTL and then preserve the session during a suspend. Signed-off-by: Alexandre Bailon Signed-off-by: Bin Liu --- drivers/usb/musb/musb_core.c | 3 ++- drivers/usb/musb/musb_core.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index b1f082f42112..27887189fd14 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -2659,7 +2659,8 @@ static int musb_suspend(struct device *dev) musb_platform_disable(musb); musb_disable_interrupts(musb); - musb_writeb(musb->mregs, MUSB_DEVCTL, 0); + if (!(musb->io.quirks & MUSB_PRESERVE_SESSION)) + musb_writeb(musb->mregs, MUSB_DEVCTL, 0); WARN_ON(!list_empty(&musb->pending_list)); spin_lock_irqsave(&musb->lock, flags); diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h index ade902ea1221..ab0c858af9d3 100644 --- a/drivers/usb/musb/musb_core.h +++ b/drivers/usb/musb/musb_core.h @@ -172,6 +172,7 @@ enum musb_g_ep0_state { */ struct musb_platform_ops { +#define MUSB_PRESERVE_SESSION BIT(7) #define MUSB_DMA_UX500 BIT(6) #define MUSB_DMA_CPPI41 BIT(5) #define MUSB_DMA_CPPI BIT(4)