From patchwork Mon May 19 13:39:36 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: George Cherian X-Patchwork-Id: 4202571 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id A3F8FBEEAB for ; Mon, 19 May 2014 13:42:13 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B4D1A202A1 for ; Mon, 19 May 2014 13:42:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E6E6420251 for ; Mon, 19 May 2014 13:42:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932188AbaESNls (ORCPT ); Mon, 19 May 2014 09:41:48 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:39563 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932166AbaESNll (ORCPT ); Mon, 19 May 2014 09:41:41 -0400 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id s4JDfe4V003922; Mon, 19 May 2014 08:41:40 -0500 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 s4JDfeRa016438; Mon, 19 May 2014 08:41:40 -0500 Received: from dflp32.itg.ti.com (10.64.6.15) by DFLE72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.3.174.1; Mon, 19 May 2014 08:41:40 -0500 Received: from george-pc.apr.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id s4JDf8Y9028427; Mon, 19 May 2014 08:41:38 -0500 From: George Cherian To: , , CC: , , , , George Cherian Subject: [PATCH v4 6/6] usb: musb: dsps: Enable sw babble control for newer silicon Date: Mon, 19 May 2014 19:09:36 +0530 Message-ID: <1400506776-2816-7-git-send-email-george.cherian@ti.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1400506776-2816-1-git-send-email-george.cherian@ti.com> References: <1400506776-2816-1-git-send-email-george.cherian@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 Find whether we are running on newer silicon. The babble control register reads 0x4 by default in newer silicon as opposed to 0 in old versions of AM335x. Based on this enable the sw babble control logic. Signed-off-by: George Cherian --- drivers/usb/musb/musb_dsps.c | 37 +++++++++++++++++++++++++++++++------ 1 file changed, 31 insertions(+), 6 deletions(-) diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c index eb1985a..8daccb2 100644 --- a/drivers/usb/musb/musb_dsps.c +++ b/drivers/usb/musb/musb_dsps.c @@ -136,6 +136,7 @@ struct dsps_glue { const struct dsps_musb_wrapper *wrp; /* wrapper register offsets */ struct timer_list timer; /* otg_workaround timer */ unsigned long last_timer; /* last timer data for each instance */ + bool sw_babble_enabled; struct dsps_context context; struct debugfs_regset32 regset; @@ -469,6 +470,19 @@ static int dsps_musb_init(struct musb *musb) val &= ~(1 << wrp->otg_disable); dsps_writel(musb->ctrl_base, wrp->phy_utmi, val); + /* + * Check whether the dsps version has babble control enabled. + * In latest silicon revision the babble control logic is enabled. + * If MUSB_BABBLE_CTL returns 0x4 then we have the babble control + * logic enabled. + */ + val = dsps_readb(musb->mregs, MUSB_BABBLE_CTL); + if (val == MUSB_BABBLE_RCV_DISABLE) { + glue->sw_babble_enabled = true; + val |= MUSB_BABBLE_SW_SESSION_CTRL; + dsps_writeb(musb->mregs, MUSB_BABBLE_CTL, val); + } + ret = dsps_musb_dbg_init(musb, glue); if (ret) return ret; @@ -591,14 +605,25 @@ static int dsps_musb_reset(struct musb *musb) struct device *dev = musb->controller; struct dsps_glue *glue = dev_get_drvdata(dev->parent); const struct dsps_musb_wrapper *wrp = glue->wrp; + int session_restart = 0; - dsps_writel(musb->ctrl_base, wrp->control, (1 << wrp->reset)); - usleep_range(100, 200); - usb_phy_shutdown(musb->xceiv); - usleep_range(100, 200); - usb_phy_init(musb->xceiv); + if (glue->sw_babble_enabled) + session_restart = sw_babble_control(musb); + /* + * In case of new silicon version babble condition can be recovered + * without resetting the MUSB. But for older silicon versions, MUSB + * reset is needed + */ + if (session_restart || !glue->sw_babble_enabled) { + dsps_writel(musb->ctrl_base, wrp->control, (1 << wrp->reset)); + usleep_range(100, 200); + usb_phy_shutdown(musb->xceiv); + usleep_range(100, 200); + usb_phy_init(musb->xceiv); + session_restart = 1; + } - return 0; + return !session_restart; } static struct musb_platform_ops dsps_ops = {