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,URIBL_BLOCKED,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 B4C89C17443 for ; Sun, 10 Nov 2019 03:16:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D31E20854 for ; Sun, 10 Nov 2019 03:16:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573355814; bh=oO0gUUG/vj63i5VoHzt41VVsBO2NgniuaSJlilhfdaM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Fer16t5VMMcypwt4m2FXndCjRT5tNTiYfxlZPYTocRrWgEba/P5XwPvjPiPvHZBd4 xArrApx8dLCYZJryNMFGsuTCjUYdkeHdT+qsqwY1PAvW3cYkzWrqgZtBQR3D24RcwT 3jFRv/y+YToVWSB7CApWpqKMFtRVqysW2ZWX5XQc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726988AbfKJCkj (ORCPT ); Sat, 9 Nov 2019 21:40:39 -0500 Received: from mail.kernel.org ([198.145.29.99]:33360 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726879AbfKJCk2 (ORCPT ); Sat, 9 Nov 2019 21:40:28 -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 74149214E0; Sun, 10 Nov 2019 02:40:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573353627; bh=oO0gUUG/vj63i5VoHzt41VVsBO2NgniuaSJlilhfdaM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XEWhsSV9NiosNOrZLv/YenTHS8tzauTd4M4a4pK+wGJuD37DU7Qpsv7yUIWa/leqr dqUhUzZx4tf5l/uVcxKgLoTtTDUw2X1kZWTH2I5AUBEufqo++uJzhi3h55YVfR9sDI 7vcw/Ldc1D6tE+/bIk3W3kJn41qbpbEvBgPPURVw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Marek Szyprowski , Krzysztof Kozlowski , Greg Kroah-Hartman , Sasha Levin , linux-serial@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 011/191] serial: samsung: Enable baud clock for UART reset procedure in resume Date: Sat, 9 Nov 2019 21:37:13 -0500 Message-Id: <20191110024013.29782-11-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191110024013.29782-1-sashal@kernel.org> References: <20191110024013.29782-1-sashal@kernel.org> 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: Marek Szyprowski [ Upstream commit 1ff3652bc7111df26b5807037f624be294cf69d5 ] Ensure that the baud clock is also enabled for UART register writes in driver resume. On Exynos5433 SoC this is needed to avoid external abort issue. Signed-off-by: Marek Szyprowski Reviewed-by: Krzysztof Kozlowski Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/samsung.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index c6058b52d5d59..2a49b6d876b87 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1944,7 +1944,11 @@ static int s3c24xx_serial_resume(struct device *dev) if (port) { clk_prepare_enable(ourport->clk); + if (!IS_ERR(ourport->baudclk)) + clk_prepare_enable(ourport->baudclk); s3c24xx_serial_resetport(port, s3c24xx_port_to_cfg(port)); + if (!IS_ERR(ourport->baudclk)) + clk_disable_unprepare(ourport->baudclk); clk_disable_unprepare(ourport->clk); uart_resume_port(&s3c24xx_uart_drv, port); @@ -1967,7 +1971,11 @@ static int s3c24xx_serial_resume_noirq(struct device *dev) if (rx_enabled(port)) uintm &= ~S3C64XX_UINTM_RXD_MSK; clk_prepare_enable(ourport->clk); + if (!IS_ERR(ourport->baudclk)) + clk_prepare_enable(ourport->baudclk); wr_regl(port, S3C64XX_UINTM, uintm); + if (!IS_ERR(ourport->baudclk)) + clk_disable_unprepare(ourport->baudclk); clk_disable_unprepare(ourport->clk); } } -- 2.20.1