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=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 A906FC433EB for ; Mon, 27 Jul 2020 14:08:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 847772073E for ; Mon, 27 Jul 2020 14:08:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595858927; bh=bkASIU+tcHNYr4Je/uAYwATeDov4hpolKUnT+rpI18o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FlpyCryHL1JefP7k20vsscxOYxg1Xtqo64KIk3VzZFCgZvncmOXuLSFsLyKl6F317 BSxMjK0mS+6tGzi/zixH3uFDt8rdjdExX2cUPeOBWHCKpWPSHWdGNZ6ieARDc1AQtR eI1FTbyJG5S7o9hXavrRtFkELiPAeFrS0phswZPo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729082AbgG0OIn (ORCPT ); Mon, 27 Jul 2020 10:08:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:58294 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729472AbgG0OIm (ORCPT ); Mon, 27 Jul 2020 10:08:42 -0400 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 973732083E; Mon, 27 Jul 2020 14:08:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595858922; bh=bkASIU+tcHNYr4Je/uAYwATeDov4hpolKUnT+rpI18o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fXdG92NdjLEur3fUcO8BtQ7iO+bBu5qkvwluBhMJQng4+yPTfbMwPq6JUGiWCeoe0 M1/GLxgmBbr7WK6cKiexBlS+0J/cAXESp7wDMOKZzz9Z5BQTL6wt/TEdRDICbGiLZT hxoP4pwvfThGjJyyZ7PdIvP6oSpEn0hY7zuD43FA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Matthew Howell , Sasha Levin Subject: [PATCH 4.14 32/64] serial: exar: Fix GPIO configuration for Sealevel cards based on XR17V35X Date: Mon, 27 Jul 2020 16:04:11 +0200 Message-Id: <20200727134912.750933479@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200727134911.020675249@linuxfoundation.org> References: <20200727134911.020675249@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Matthew Howell [ Upstream commit 5fdbe136ae19ab751daaa4d08d9a42f3e30d17f9 ] Sealevel XR17V35X based devices are inoperable on kernel versions 4.11 and above due to a change in the GPIO preconfiguration introduced in commit 7dea8165f1d. This patch fixes this by preconfiguring the GPIO on Sealevel cards to the value (0x00) used prior to commit 7dea8165f1d With GPIOs preconfigured as per commit 7dea8165f1d all ports on Sealevel XR17V35X based devices become stuck in high impedance mode, regardless of dip-switch or software configuration. This causes the device to become effectively unusable. This patch (in various forms) has been distributed to our customers and no issues related to it have been reported. Fixes: 7dea8165f1d6 ("serial: exar: Preconfigure xr17v35x MPIOs as output") Signed-off-by: Matthew Howell Link: https://lore.kernel.org/r/alpine.DEB.2.21.2007221605270.13247@tstest-VirtualBox Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/8250/8250_exar.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c index 899f36b59af79..ed81128bb42e0 100644 --- a/drivers/tty/serial/8250/8250_exar.c +++ b/drivers/tty/serial/8250/8250_exar.c @@ -229,7 +229,17 @@ static void setup_gpio(struct pci_dev *pcidev, u8 __iomem *p) * devices will export them as GPIOs, so we pre-configure them safely * as inputs. */ - u8 dir = pcidev->vendor == PCI_VENDOR_ID_EXAR ? 0xff : 0x00; + + u8 dir = 0x00; + + if ((pcidev->vendor == PCI_VENDOR_ID_EXAR) && + (pcidev->subsystem_vendor != PCI_VENDOR_ID_SEALEVEL)) { + // Configure GPIO as inputs for Commtech adapters + dir = 0xff; + } else { + // Configure GPIO as outputs for SeaLevel adapters + dir = 0x00; + } writeb(0x00, p + UART_EXAR_MPIOINT_7_0); writeb(0x00, p + UART_EXAR_MPIOLVL_7_0); -- 2.25.1