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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 718E3C3F370 for ; Thu, 27 Feb 2020 14:21:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 49ED724688 for ; Thu, 27 Feb 2020 14:21:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582813282; bh=4i914oy72634ngbPTasVtJ9HokkeB25gdGfM/Zoz6Oo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SAVaKgUwBM90af6ZNZ3SVZBAHMnon4PZvQNKxVU8l2v7/kX3FlXToHkqzPkoyZrqk EkoY3LdwcSlpq6vl5GrZzAVGOAUBQr8dMENffftYwR2Vss97xbUnupMVVS2VVTDp0o WJb/4xe4Se1XUb4JnZWyVY/Rh3l2tMSPm88f+eRE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389856AbgB0OVV (ORCPT ); Thu, 27 Feb 2020 09:21:21 -0500 Received: from mail.kernel.org ([198.145.29.99]:57332 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389631AbgB0ORC (ORCPT ); Thu, 27 Feb 2020 09:17:02 -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 45B352468F; Thu, 27 Feb 2020 14:17:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582813021; bh=4i914oy72634ngbPTasVtJ9HokkeB25gdGfM/Zoz6Oo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hW2EYL637uSftS7gaoeLygNik62A8qP7oCo5POnYJbmJ6DbK5tOyw05yb+HkAohfO ysGkuCACCKNNgkQS1HON4rkTun/Lz2spal+3T01fzXw4pOoR5xuxAkPjsyU8xNlmmA FANqNEexIJtLWvQ6wGJ6ABwi6gz07PtKQ9FzsTtk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, satya priya Subject: [PATCH 5.5 067/150] tty: serial: qcom_geni_serial: Fix RX cancel command failure Date: Thu, 27 Feb 2020 14:36:44 +0100 Message-Id: <20200227132242.865884014@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200227132232.815448360@linuxfoundation.org> References: <20200227132232.815448360@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: satya priya commit 679aac5ead2f18d223554a52b543e1195e181811 upstream. RX cancel command fails when BT is switched on and off multiple times. To handle this, poll for the cancel bit in SE_GENI_S_IRQ_STATUS register instead of SE_GENI_S_CMD_CTRL_REG. As per the HPG update, handle the RX last bit after cancel command and flush out the RX FIFO buffer. Signed-off-by: satya priya Cc: stable Link: https://lore.kernel.org/r/1581415982-8793-1-git-send-email-skakit@codeaurora.org Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/qcom_geni_serial.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -128,6 +128,7 @@ static int handle_rx_console(struct uart static int handle_rx_uart(struct uart_port *uport, u32 bytes, bool drop); static unsigned int qcom_geni_serial_tx_empty(struct uart_port *port); static void qcom_geni_serial_stop_rx(struct uart_port *uport); +static void qcom_geni_serial_handle_rx(struct uart_port *uport, bool drop); static const unsigned long root_freq[] = {7372800, 14745600, 19200000, 29491200, 32000000, 48000000, 64000000, 80000000, @@ -618,7 +619,7 @@ static void qcom_geni_serial_stop_rx(str u32 irq_en; u32 status; struct qcom_geni_serial_port *port = to_dev_port(uport, uport); - u32 irq_clear = S_CMD_DONE_EN; + u32 s_irq_status; irq_en = readl(uport->membase + SE_GENI_S_IRQ_EN); irq_en &= ~(S_RX_FIFO_WATERMARK_EN | S_RX_FIFO_LAST_EN); @@ -634,10 +635,19 @@ static void qcom_geni_serial_stop_rx(str return; geni_se_cancel_s_cmd(&port->se); - qcom_geni_serial_poll_bit(uport, SE_GENI_S_CMD_CTRL_REG, - S_GENI_CMD_CANCEL, false); + qcom_geni_serial_poll_bit(uport, SE_GENI_S_IRQ_STATUS, + S_CMD_CANCEL_EN, true); + /* + * If timeout occurs secondary engine remains active + * and Abort sequence is executed. + */ + s_irq_status = readl(uport->membase + SE_GENI_S_IRQ_STATUS); + /* Flush the Rx buffer */ + if (s_irq_status & S_RX_FIFO_LAST_EN) + qcom_geni_serial_handle_rx(uport, true); + writel(s_irq_status, uport->membase + SE_GENI_S_IRQ_CLEAR); + status = readl(uport->membase + SE_GENI_STATUS); - writel(irq_clear, uport->membase + SE_GENI_S_IRQ_CLEAR); if (status & S_GENI_CMD_ACTIVE) qcom_geni_serial_abort_rx(uport); }