From patchwork Thu Sep 3 15:04:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Satya Priya X-Patchwork-Id: 11753971 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AE6781575 for ; Thu, 3 Sep 2020 15:07:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A0E6C20722 for ; Thu, 3 Sep 2020 15:07:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729514AbgICPFu (ORCPT ); Thu, 3 Sep 2020 11:05:50 -0400 Received: from alexa-out.qualcomm.com ([129.46.98.28]:45300 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729357AbgICPFt (ORCPT ); Thu, 3 Sep 2020 11:05:49 -0400 Received: from ironmsg07-lv.qualcomm.com (HELO ironmsg07-lv.qulacomm.com) ([10.47.202.151]) by alexa-out.qualcomm.com with ESMTP; 03 Sep 2020 08:05:36 -0700 Received: from ironmsg02-blr.qualcomm.com ([10.86.208.131]) by ironmsg07-lv.qulacomm.com with ESMTP/TLS/AES256-SHA; 03 Sep 2020 08:05:34 -0700 Received: from c-skakit-linux.ap.qualcomm.com (HELO c-skakit-linux.qualcomm.com) ([10.242.51.242]) by ironmsg02-blr.qualcomm.com with ESMTP; 03 Sep 2020 20:35:05 +0530 Received: by c-skakit-linux.qualcomm.com (Postfix, from userid 2344709) id E50A244AB; Thu, 3 Sep 2020 20:35:04 +0530 (IST) From: satya priya To: Bjorn Andersson Cc: Matthias Kaehlcke , gregkh@linuxfoundation.org, Andy Gross , Rob Herring , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, akashast@codeaurora.org, rojay@codeaurora.org, msavaliy@qti.qualcomm.com, satya priya Subject: [PATCH V4 4/4] tty: serial: qcom_geni_serial: Fix the UART wakeup issue Date: Thu, 3 Sep 2020 20:34:58 +0530 Message-Id: <1599145498-20707-5-git-send-email-skakit@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1599145498-20707-1-git-send-email-skakit@codeaurora.org> References: <1599145498-20707-1-git-send-email-skakit@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org As a part of system suspend uart_port_suspend is called from the Serial driver, which calls set_mctrl passing mctrl as NULL. This makes RFR high(NOT_READY) during suspend. Due to this BT SoC is not able to send wakeup bytes to UART during suspend. Include if check for non-suspend case to keep RFR low during suspend. Signed-off-by: satya priya Acked-by: Greg Kroah-Hartman Reviewed-by: Akash Asthana --- Changes in V2: - This patch fixes the UART flow control issue during suspend. Newly added in V2. Changes in V3: - As per Matthias's comment removed the extra parentheses. Changes in V4: - No change. drivers/tty/serial/qcom_geni_serial.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 07b7b6b..2aad9d7 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -242,7 +242,7 @@ static void qcom_geni_serial_set_mctrl(struct uart_port *uport, if (mctrl & TIOCM_LOOP) port->loopback = RX_TX_CTS_RTS_SORTED; - if (!(mctrl & TIOCM_RTS)) + if (!(mctrl & TIOCM_RTS) && !uport->suspended) uart_manual_rfr = UART_MANUAL_RFR_EN | UART_RFR_NOT_READY; writel(uart_manual_rfr, uport->membase + SE_UART_MANUAL_RFR); }