From nobody Thu Apr 9 14:57:49 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC0F4C433FE for ; Mon, 7 Nov 2022 11:07:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231679AbiKGLHq (ORCPT ); Mon, 7 Nov 2022 06:07:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59984 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231356AbiKGLHc (ORCPT ); Mon, 7 Nov 2022 06:07:32 -0500 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7256218364; Mon, 7 Nov 2022 03:07:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1667819251; x=1699355251; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=gbTRCkxxLdOZW1y6aGgrb7XRmU8BTA5iNZdcQ5OXGmE=; b=TKH12svCttUpMooVWeFxd0W2LsXEOWYvyXaD0JViSkjlGlTvo4q/CgO0 kLPRU1255lpL/Kiqa7ZtfLvRNtX/yCwjHF5simTlPezMC9hmC25W9QF0h z+KDN7btn4j5mZnJ02w7AgftCYk+YJr/RHnhHil78tlUUXbGsOPQoEiOw efwkvLeX/se+ZwYSN7HN3TCkGvTHLOpETc2pKmYFHPsnQzuka21YLNHah QZiv72y2wEJlAIEJM8Y27as5KA4mQgmeog4/RyiqpVc6yR0hUeqsthT/x vZ4B0g57V1tsWq9zHYtGzb6M05z+w8OoIQzX+qxabG/5MJeYP0Q82jVZr A==; X-IronPort-AV: E=McAfee;i="6500,9779,10523"; a="290773035" X-IronPort-AV: E=Sophos;i="5.96,143,1665471600"; d="scan'208";a="290773035" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Nov 2022 03:07:29 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10523"; a="586932376" X-IronPort-AV: E=Sophos;i="5.96,143,1665471600"; d="scan'208";a="586932376" Received: from gschoede-mobl1.ger.corp.intel.com (HELO ijarvine-MOBL2.ger.corp.intel.com) ([10.252.46.211]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Nov 2022 03:07:26 -0800 From: =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= To: Andy Shevchenko , Greg Kroah-Hartman , Jiri Slaby , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= Cc: stable@vger.kernel.org, Wentong Wu , Srikanth Thokala , Aman Kumar Subject: [PATCH 3/4] serial: 8250_lpss: Use 16B DMA burst with Elkhart Lake Date: Mon, 7 Nov 2022 13:07:07 +0200 Message-Id: <20221107110708.58223-4-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221107110708.58223-1-ilpo.jarvinen@linux.intel.com> References: <20221107110708.58223-1-ilpo.jarvinen@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Configure DMA to use 16B burst size with Elkhart Lake. This makes the bus use more efficient and works around an issue which occurs with the previously used 1B. Fixes: 0a9410b981e9 ("serial: 8250_lpss: Enable DMA on Intel Elkhart Lake") Cc: # serial: 8250_lpss: Configure DMA also w/o DM= A filter Reported-by: Wentong Wu Co-developed-by: Srikanth Thokala Signed-off-by: Srikanth Thokala Co-developed-by: Aman Kumar Signed-off-by: Aman Kumar Signed-off-by: Ilpo J=C3=A4rvinen --- I know the list of Co-dev-bys & Sob seems a bit odd for a oneliner. The reason is that I cleaned up this from a more complex patch using the earlier change that I authored myself so only this oneliner remained in this patch. --- drivers/tty/serial/8250/8250_lpss.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/= 8250_lpss.c index ed281445a97d..e0b4e1446eac 100644 --- a/drivers/tty/serial/8250/8250_lpss.c +++ b/drivers/tty/serial/8250/8250_lpss.c @@ -174,6 +174,8 @@ static int ehl_serial_setup(struct lpss8250 *lpss, stru= ct uart_port *port) */ up->dma =3D dma; =20 + lpss->dma_maxburst =3D 16; + port->set_termios =3D dw8250_do_set_termios; =20 return 0; --=20 2.30.2