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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 E0207C12002 for ; Wed, 21 Jul 2021 16:25:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C38F46120E for ; Wed, 21 Jul 2021 16:25:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234164AbhGUPow (ORCPT ); Wed, 21 Jul 2021 11:44:52 -0400 Received: from mga01.intel.com ([192.55.52.88]:26287 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235313AbhGUPoB (ORCPT ); Wed, 21 Jul 2021 11:44:01 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10052"; a="233274550" X-IronPort-AV: E=Sophos;i="5.84,258,1620716400"; d="scan'208";a="233274550" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Jul 2021 09:24:30 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,258,1620716400"; d="scan'208";a="564789777" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga004.jf.intel.com with ESMTP; 21 Jul 2021 09:24:28 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id 7E303FF; Wed, 21 Jul 2021 19:24:56 +0300 (EEST) From: Andy Shevchenko To: Andy Shevchenko , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , Jiri Slaby Subject: [PATCH v1 1/1] serial: 8250_lpss: Enable DMA on Intel Elkhart Lake Date: Wed, 21 Jul 2021 19:24:52 +0300 Message-Id: <20210721162452.48764-1-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org PSE UARTs on Intel Elkhart Lake support DMA mode. Enable DMA on these ports. Signed-off-by: Andy Shevchenko --- drivers/tty/serial/8250/8250_lpss.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c index 4dee8a9e0c95..848d81e3838c 100644 --- a/drivers/tty/serial/8250/8250_lpss.c +++ b/drivers/tty/serial/8250/8250_lpss.c @@ -158,6 +158,16 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port) static int ehl_serial_setup(struct lpss8250 *lpss, struct uart_port *port) { + struct uart_8250_dma *dma = &lpss->data.dma; + struct uart_8250_port *up = up_to_u8250p(port); + + /* + * This simply makes the checks in the 8250_port to try the DMA + * channel request which in turn uses the magic of ACPI tables + * parsing (see drivers/dma/acpi-dma.c for the details) and + * matching with the registered General Purpose DMA controllers. + */ + up->dma = dma; return 0; } -- 2.30.2