From patchwork Thu Sep 22 11:18:59 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 9345067 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id F3B7B60757 for ; Thu, 22 Sep 2016 11:21:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E565C2A9AF for ; Thu, 22 Sep 2016 11:21:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D81532A9CB; Thu, 22 Sep 2016 11:21:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 6B78E2A9AF for ; Thu, 22 Sep 2016 11:21:19 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bn22b-0000VJ-L0; Thu, 22 Sep 2016 11:19:45 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bn22J-0000He-1G for linux-arm-kernel@lists.infradead.org; Thu, 22 Sep 2016 11:19:28 +0000 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 01E723BEAD; Thu, 22 Sep 2016 11:19:06 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-112-20.ams2.redhat.com [10.36.112.20]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u8MBJ25n028509; Thu, 22 Sep 2016 07:19:03 -0400 From: Hans de Goede To: Bin Liu , Greg Kroah-Hartman , Kishon Vijay Abraham I Subject: [PATCH v2 1/3] phy_sun4i_usb: set_mode: Allow using set_mode to force end the current session Date: Thu, 22 Sep 2016 14:18:59 +0300 Message-Id: <20160922111901.15337-1-hdegoede@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Thu, 22 Sep 2016 11:19:06 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160922_041927_167020_D45BE69C X-CRM114-Status: GOOD ( 13.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Hans de Goede , Maxime Ripard , linux-usb@vger.kernel.org, Chen-Yu Tsai , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The sunxi musb has a bug where sometimes it will generate a babble error on device disconnect instead of a disconnect irq. When this happens the musb-controller switches from host mode to device mode (it clears MUSB_DEVCTL_SESSION and sets MUSB_DEVCTL_BDEVICE) and gets stuck in this state. Clearing this requires reporting Vbus low for 200 or more ms, but on some devices Vbus is simply always high (host-only mode, no Vbus control). This commit modifies sun4i_usb_phy_set_mode so that it will force end the current session when called with the current mode, before this commit calling set_mode with the current mode was a nop since id_det would stay the same resulting in the detect_work not doing anything. This allows the sunxi-musb glue to use sun4i_usb_phy_set_mode to force end the current session without changing the mode, to fixup the stuck state after a babble error. Signed-off-by: Hans de Goede --- Changes in v2: -New patch in v2 of this series replacing the "phy-sun4i-usb: Add sun4i_usb_phy_force_session_end() function" from v1 --- drivers/phy/phy-sun4i-usb.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c index 43c0d98..d76538c 100644 --- a/drivers/phy/phy-sun4i-usb.c +++ b/drivers/phy/phy-sun4i-usb.c @@ -437,25 +437,32 @@ static int sun4i_usb_phy_set_mode(struct phy *_phy, enum phy_mode mode) { struct sun4i_usb_phy *phy = phy_get_drvdata(_phy); struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy); + enum usb_dr_mode new_mode; if (phy->index != 0) return -EINVAL; switch (mode) { case PHY_MODE_USB_HOST: - data->dr_mode = USB_DR_MODE_HOST; + new_mode = USB_DR_MODE_HOST; break; case PHY_MODE_USB_DEVICE: - data->dr_mode = USB_DR_MODE_PERIPHERAL; + new_mode = USB_DR_MODE_PERIPHERAL; break; case PHY_MODE_USB_OTG: - data->dr_mode = USB_DR_MODE_OTG; + new_mode = USB_DR_MODE_OTG; break; default: return -EINVAL; } - dev_info(&_phy->dev, "Changing dr_mode to %d\n", (int)data->dr_mode); + if (new_mode != data->dr_mode) { + dev_info(&_phy->dev, "Changing dr_mode to %d\n", + (int)data->dr_mode); + data->dr_mode = new_mode; + } + + data->id_det = -1; /* Force reprocessing of id */ data->force_session_end = true; queue_delayed_work(system_wq, &data->detect, 0);