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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 3100BC3F2D2 for ; Tue, 3 Mar 2020 02:51:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 080C6246D9 for ; Tue, 3 Mar 2020 02:51:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583203861; bh=sOAGFuQmdWeLvsjXjqeTg71nvzmjKCDHQHCRceyd3eA=; h=From:To:Cc:Subject:Date:List-ID:From; b=LxMHIEBdkky6H7On42pfN2oyPr09A+zF+xIOjt+RDxJwBEpG0YMsXlaAqDatPwyAY Nyx0tclvOURf/OQ7CwmQINfWmdj4LgXD+PNG1g2/6Kk+njUlMKDR9XTfUegNx5+rX7 fvviEl7xw+Pvtlb6i25XDagY4TCRco3/Nxj3Ptww= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729208AbgCCCuf (ORCPT ); Mon, 2 Mar 2020 21:50:35 -0500 Received: from mail.kernel.org ([198.145.29.99]:47222 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729152AbgCCCuX (ORCPT ); Mon, 2 Mar 2020 21:50:23 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 48827246E7; Tue, 3 Mar 2020 02:50:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583203823; bh=sOAGFuQmdWeLvsjXjqeTg71nvzmjKCDHQHCRceyd3eA=; h=From:To:Cc:Subject:Date:From; b=jz0ckZ9vLUlabOubgMhvIFGtOn5QIGAIs1KwDesnACf/NBQolSisQIIwL/DnRuvWE O7BkPBzZPA8B05ksPxU17VkDWKLlOVk8+W4qzzgMWO7157LQxGWN7tDOfjtB/OfmRg 5V62PMS8gtvocm/5t1+Zy0dqaTejcakBvoW8bbPU= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Daniel Golle , Chuanhong Guo , Greg Kroah-Hartman , Sasha Levin , linux-serial@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 01/11] serial: ar933x_uart: set UART_CS_{RX,TX}_READY_ORIDE Date: Mon, 2 Mar 2020 21:50:11 -0500 Message-Id: <20200303025021.10754-1-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Daniel Golle [ Upstream commit 87c5cbf71ecbb9e289d60a2df22eb686c70bf196 ] On AR934x this UART is usually not initialized by the bootloader as it is only used as a secondary serial port while the primary UART is a newly introduced NS16550-compatible. In order to make use of the ar933x-uart on AR934x without RTS/CTS hardware flow control, one needs to set the UART_CS_{RX,TX}_READY_ORIDE bits as other than on AR933x where this UART is used as primary/console, the bootloader on AR934x typically doesn't set those bits. Setting them explicitely on AR933x should not do any harm, so just set them unconditionally. Tested-by: Chuanhong Guo Signed-off-by: Daniel Golle Link: https://lore.kernel.org/r/20200207095335.GA179836@makrotopia.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/ar933x_uart.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c index 1519d2ca7705f..40194791cde0b 100644 --- a/drivers/tty/serial/ar933x_uart.c +++ b/drivers/tty/serial/ar933x_uart.c @@ -294,6 +294,10 @@ static void ar933x_uart_set_termios(struct uart_port *port, ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, AR933X_UART_CS_HOST_INT_EN); + /* enable RX and TX ready overide */ + ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, + AR933X_UART_CS_TX_READY_ORIDE | AR933X_UART_CS_RX_READY_ORIDE); + /* reenable the UART */ ar933x_uart_rmw(up, AR933X_UART_CS_REG, AR933X_UART_CS_IF_MODE_M << AR933X_UART_CS_IF_MODE_S, @@ -426,6 +430,10 @@ static int ar933x_uart_startup(struct uart_port *port) ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, AR933X_UART_CS_HOST_INT_EN); + /* enable RX and TX ready overide */ + ar933x_uart_rmw_set(up, AR933X_UART_CS_REG, + AR933X_UART_CS_TX_READY_ORIDE | AR933X_UART_CS_RX_READY_ORIDE); + /* Enable RX interrupts */ up->ier = AR933X_UART_INT_RX_VALID; ar933x_uart_write(up, AR933X_UART_INT_EN_REG, up->ier); -- 2.20.1