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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 95873ECAAA1 for ; Mon, 24 Oct 2022 15:00:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232479AbiJXPAR (ORCPT ); Mon, 24 Oct 2022 11:00:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52842 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231149AbiJXO7g (ORCPT ); Mon, 24 Oct 2022 10:59:36 -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 D384C132249; Mon, 24 Oct 2022 06:37:00 -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 8CAEB61330; Mon, 24 Oct 2022 12:56:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B616C433C1; Mon, 24 Oct 2022 12:56:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666616178; bh=NF7v3Ni4t2EjxnCdZQDAN1XxUriaIun6viozetKWNXM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K+W5ffzWK4oQhVcHa5d0E6gCdBpzI5Xd8Rk6m4EbtzElpSCbYvwdb5iCFmSRrl2V0 3zLg62kmXm177BCjohC38OFeHta0OR+MMRxtrRRhS13VRNOupjowHe7RRISwPrNfp4 YVykW8fduhWEronXlC355GtwDqKG3dlCrDy/wnow= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Piyush Mehta , Sasha Levin Subject: [PATCH 5.15 499/530] usb: dwc3: core: Enable GUCTL1 bit 10 for fixing termination error after resume bug Date: Mon, 24 Oct 2022 13:34:03 +0200 Message-Id: <20221024113107.635661787@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221024113044.976326639@linuxfoundation.org> References: <20221024113044.976326639@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Piyush Mehta [ Upstream commit 63d7f9810a38102cdb8cad214fac98682081e1a7 ] When configured in HOST mode, after issuing U3/L2 exit controller fails to send proper CRC checksum in CRC5 field. Because of this behavior Transaction Error is generated, resulting in reset and re-enumeration of usb device attached. Enabling chicken bit 10 of GUCTL1 will correct this problem. When this bit is set to '1', the UTMI/ULPI opmode will be changed to "normal" along with HS terminations, term, and xcvr signals after EOR. This option is to support certain legacy UTMI/ULPI PHYs. Added "snps,resume-hs-terminations" quirk to resolved the above issue. Signed-off-by: Piyush Mehta Link: https://lore.kernel.org/r/20220920052235.194272-3-piyush.mehta@amd.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/dwc3/core.c | 17 +++++++++++++++++ drivers/usb/dwc3/core.h | 4 ++++ 2 files changed, 21 insertions(+) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index c32ca691bcc7..a2f3e56aba05 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1041,6 +1041,21 @@ static int dwc3_core_init(struct dwc3 *dwc) dwc3_writel(dwc->regs, DWC3_GUCTL2, reg); } + /* + * When configured in HOST mode, after issuing U3/L2 exit controller + * fails to send proper CRC checksum in CRC5 feild. Because of this + * behaviour Transaction Error is generated, resulting in reset and + * re-enumeration of usb device attached. All the termsel, xcvrsel, + * opmode becomes 0 during end of resume. Enabling bit 10 of GUCTL1 + * will correct this problem. This option is to support certain + * legacy ULPI PHYs. + */ + if (dwc->resume_hs_terminations) { + reg = dwc3_readl(dwc->regs, DWC3_GUCTL1); + reg |= DWC3_GUCTL1_RESUME_OPMODE_HS_HOST; + dwc3_writel(dwc->regs, DWC3_GUCTL1, reg); + } + if (!DWC3_VER_IS_PRIOR(DWC3, 250A)) { reg = dwc3_readl(dwc->regs, DWC3_GUCTL1); @@ -1383,6 +1398,8 @@ static void dwc3_get_properties(struct dwc3 *dwc) "snps,dis-del-phy-power-chg-quirk"); dwc->dis_tx_ipgap_linecheck_quirk = device_property_read_bool(dev, "snps,dis-tx-ipgap-linecheck-quirk"); + dwc->resume_hs_terminations = device_property_read_bool(dev, + "snps,resume-hs-terminations"); dwc->parkmode_disable_ss_quirk = device_property_read_bool(dev, "snps,parkmode-disable-ss-quirk"); diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 077d03a33388..e82e4cbe4ec7 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -260,6 +260,7 @@ #define DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS BIT(28) #define DWC3_GUCTL1_DEV_L1_EXIT_BY_HW BIT(24) #define DWC3_GUCTL1_PARKMODE_DISABLE_SS BIT(17) +#define DWC3_GUCTL1_RESUME_OPMODE_HS_HOST BIT(10) /* Global Status Register */ #define DWC3_GSTS_OTG_IP BIT(10) @@ -1072,6 +1073,8 @@ struct dwc3_scratchpad_array { * change quirk. * @dis_tx_ipgap_linecheck_quirk: set if we disable u2mac linestate * check during HS transmit. + * @resume-hs-terminations: Set if we enable quirk for fixing improper crc + * generation after resume from suspend. * @parkmode_disable_ss_quirk: set if we need to disable all SuperSpeed * instances in park mode. * @tx_de_emphasis_quirk: set if we enable Tx de-emphasis quirk @@ -1284,6 +1287,7 @@ struct dwc3 { unsigned dis_u2_freeclk_exists_quirk:1; unsigned dis_del_phy_power_chg_quirk:1; unsigned dis_tx_ipgap_linecheck_quirk:1; + unsigned resume_hs_terminations:1; unsigned parkmode_disable_ss_quirk:1; unsigned tx_de_emphasis_quirk:1; -- 2.35.1