From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.6 required=3.0 tests=DATE_IN_PAST_06_12, DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2B8F5C17441 for ; Tue, 12 Nov 2019 05:34:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EE1612084F for ; Tue, 12 Nov 2019 05:34:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573536842; bh=sbnFXAjpbcwJnf2+mH5IsFebJvwzJN37XivvkMyt/50=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=IgnPkhOZnkiEq0xUxXk7kDeebcLmv2bg/E4qZLyvSlXsHFTKNoHe4DHaHqpl+IxSq RrVCQ3TqY2gN4F/rikFH2b3Tpg6vLZIBsxMyy0MRsRutA4hhdkLnjB+rsG+TNa2fbU TQkoJajFytgVle6tjb2hLo0A0d/6O8SUcey4J6L4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727083AbfKLFeB (ORCPT ); Tue, 12 Nov 2019 00:34:01 -0500 Received: from mail.kernel.org ([198.145.29.99]:60760 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725775AbfKLFeA (ORCPT ); Tue, 12 Nov 2019 00:34:00 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 879C12084F; Tue, 12 Nov 2019 05:33:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573536840; bh=sbnFXAjpbcwJnf2+mH5IsFebJvwzJN37XivvkMyt/50=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rrw9OoBoJJsfH217xuK/dIynZd/Lg3JslxJZPFFOu+cHhG9k+6kIM0nBggDw4x4G0 cRUqK3qLEBrT44fRfisxQOXG8+2cSiGBD+8JHqN6tT7EhpPwCfqnia3993/K2k8qKR Nw05FMp4nIvID6V0U5M+CJ/5OXz/Z+jJcBv5Xg44= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Roger Quadros , Felipe Balbi , Tony Lindgren Subject: [PATCH 4.14 061/105] ARM: dts: dra7: Disable USB metastability workaround for USB2 Date: Mon, 11 Nov 2019 19:28:31 +0100 Message-Id: <20191111181444.963730015@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191111181421.390326245@linuxfoundation.org> References: <20191111181421.390326245@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Roger Quadros commit b8c9c6fa2002b8fd4a9710f76f80f99c6046d48c upstream. The metastability workaround causes Erratic errors [1] on the HighSpeed USB PHY which can cause upto 2 seconds delay in enumerating to a USB host while in Gadget mode. Disable the Run/Stop metastability workaround to avoid this ill effect. We are aware that this opens up the opportunity for Run/Stop metastability, however this issue has never been observed in TI releases so we think that Run/Stop metastability is a lesser evil than the PHY Erratic errors. So disable it. [1] USB controller trace during gadget enumeration irq/90-dwc3-969 [000] d... 52.323145: dwc3_event: event (00000901): Erratic Error [U0] irq/90-dwc3-969 [000] d... 52.560646: dwc3_event: event (00000901): Erratic Error [U0] irq/90-dwc3-969 [000] d... 52.798144: dwc3_event: event (00000901): Erratic Error [U0] Signed-off-by: Roger Quadros Acked-by: Felipe Balbi Signed-off-by: Tony Lindgren Signed-off-by: Greg Kroah-Hartman --- arch/arm/boot/dts/dra7.dtsi | 1 + 1 file changed, 1 insertion(+) --- a/arch/arm/boot/dts/dra7.dtsi +++ b/arch/arm/boot/dts/dra7.dtsi @@ -1540,6 +1540,7 @@ dr_mode = "otg"; snps,dis_u3_susphy_quirk; snps,dis_u2_susphy_quirk; + snps,dis_metastability_quirk; }; };