From patchwork Wed May 12 14:43:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 438348 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 95F5DC43462 for ; Wed, 12 May 2021 16:02:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 62BD161E33 for ; Wed, 12 May 2021 16:02:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236934AbhELQDD (ORCPT ); Wed, 12 May 2021 12:03:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:36238 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238204AbhELP5b (ORCPT ); Wed, 12 May 2021 11:57:31 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 189CD61940; Wed, 12 May 2021 15:30:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620833451; bh=z9QGBy61X1phM4yeWZEWvHLvKj6abIseK7g1QICcySQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Zr7AMOD1gyTGXcof1JkScnSJfzk+4AxPRyXhmuNM0v3b/9LciSPBt5fjSKLWrbhsA JINzhx3HUU96Qs03xrXvd/GwVs0HZ9MdSpd/zoYrc04kr+manc4Ig2v4D3BaujSk6I F6C53q5ctO8+NqB8i2JZJeKLE0oX0qp7zZ0nNK1c= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Erwan Le Ray , Sasha Levin Subject: [PATCH 5.11 156/601] serial: stm32: fix FIFO flush in startup and set_termios Date: Wed, 12 May 2021 16:43:53 +0200 Message-Id: <20210512144832.964803511@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144827.811958675@linuxfoundation.org> References: <20210512144827.811958675@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Erwan Le Ray [ Upstream commit 315e2d8a125ad77a1bc28f621162713f3e7aef48 ] Fifo flush set USART_RQR register by calling stm32_usart_set_bits routine (Read/Modify/Write). USART_RQR register is a write only register. So, read before write isn't correct / relevant to flush the FIFOs. Replace stm32_usart_set_bits call by writel_relaxed. Fixes: 84872dc448fe ("serial: stm32: add RX and TX FIFO flush") Signed-off-by: Erwan Le Ray Link: https://lore.kernel.org/r/20210304162308.8984-11-erwan.leray@foss.st.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/stm32-usart.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index a6295897c537..6788fb3af6cb 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -656,7 +656,7 @@ static int stm32_usart_startup(struct uart_port *port) /* RX FIFO Flush */ if (ofs->rqr != UNDEF_REG) - stm32_usart_set_bits(port, ofs->rqr, USART_RQR_RXFRQ); + writel_relaxed(USART_RQR_RXFRQ, port->membase + ofs->rqr); /* RX enabling */ val = stm32_port->cr1_irq | USART_CR1_RE | BIT(cfg->uart_enable_bit); @@ -760,8 +760,8 @@ static void stm32_usart_set_termios(struct uart_port *port, /* flush RX & TX FIFO */ if (ofs->rqr != UNDEF_REG) - stm32_usart_set_bits(port, ofs->rqr, - USART_RQR_TXFRQ | USART_RQR_RXFRQ); + writel_relaxed(USART_RQR_TXFRQ | USART_RQR_RXFRQ, + port->membase + ofs->rqr); cr1 = USART_CR1_TE | USART_CR1_RE; if (stm32_port->fifoen)