From patchwork Wed May 4 16:44:24 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 569703 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E448C433EF for ; Wed, 4 May 2022 17:09:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355374AbiEDRMy (ORCPT ); Wed, 4 May 2022 13:12:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356835AbiEDRJp (ORCPT ); Wed, 4 May 2022 13:09:45 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6845C39B9F; Wed, 4 May 2022 09:55:54 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id DDC80617D5; Wed, 4 May 2022 16:55:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35FF0C385AA; Wed, 4 May 2022 16:55:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1651683353; bh=C4EKP94MvTGCniLFfvtIL0jrQ+e0SnOl2t7SXMLH+m0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H1uNbwiMuUNt9e8zA1shUUoEA01FF9rTNNjfLLoXT57v8DFeNs13cg/i4W+29vSIH cyW7J6TQMyXmaixIx3G7nsTMzL72TKBD3h8YQyR4CJeYClkTDokt4YSerRp5JaTF7u tNEy76rfHUOydUgWjpiJPLFotvGABZRVo7Wchdt4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Thinh Nguyen Subject: [PATCH 5.17 026/225] usb: dwc3: core: Only handle soft-reset in DCTL Date: Wed, 4 May 2022 18:44:24 +0200 Message-Id: <20220504153112.653432169@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220504153110.096069935@linuxfoundation.org> References: <20220504153110.096069935@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Thinh Nguyen commit f4fd84ae0765a80494b28c43b756a95100351a94 upstream. Make sure not to set run_stop bit or link state change request while initiating soft-reset. Register read-modify-write operation may unintentionally start the controller before the initialization completes with its previous DCTL value, which can cause initialization failure. Fixes: f59dcab17629 ("usb: dwc3: core: improve reset sequence") Cc: Signed-off-by: Thinh Nguyen Link: https://lore.kernel.org/r/6aecbd78328f102003d40ccf18ceeebd411d3703.1650594792.git.Thinh.Nguyen@synopsys.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc3/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -276,7 +276,8 @@ static int dwc3_core_soft_reset(struct d reg = dwc3_readl(dwc->regs, DWC3_DCTL); reg |= DWC3_DCTL_CSFTRST; - dwc3_writel(dwc->regs, DWC3_DCTL, reg); + reg &= ~DWC3_DCTL_RUN_STOP; + dwc3_gadget_dctl_write_safe(dwc, reg); /* * For DWC_usb31 controller 1.90a and later, the DCTL.CSFRST bit