From nobody Thu Apr 9 14:58:04 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 3E485C433FE for ; Tue, 8 Nov 2022 12:20:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234183AbiKHMUd (ORCPT ); Tue, 8 Nov 2022 07:20:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39474 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234147AbiKHMUW (ORCPT ); Tue, 8 Nov 2022 07:20:22 -0500 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9905E13F1A; Tue, 8 Nov 2022 04:20:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1667910021; x=1699446021; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=U3IZ849nN3cT/APl5Y2asdOcNM93x6vO1SV0zIv20QY=; b=Qax7mrGSGeYBpn/CaFXYJltw4Gg3DtYwjToKeGya+YPxMhmJHacscoXZ BPqplRx+rL3FjUxQequuozACbBayotfztyi+zjgCpvkQ6noqF2UQ7XBru IAZNjM5Y1s82Q2lD0qsKDMoy0suudY620MVzSi34TPlg4W7uXXehEV9Gc v8yOUUZoc9SjtggPOk+URBtnWnZTU1avRoUtMcHkjm5Mh5MK/cezvy2ei SiQDNkPmwS+AR+0zsjeXAR1tOFDgzUc+uKRT7quX9ItnNq70/co0h63lb h1RJKreLCZsuw5v89xIHyAYAAdWAjTftc1f9J4aW4LIxrVMQ4XZml0leP Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10524"; a="374951461" X-IronPort-AV: E=Sophos;i="5.96,147,1665471600"; d="scan'208";a="374951461" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Nov 2022 04:20:21 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10524"; a="741932222" X-IronPort-AV: E=Sophos;i="5.96,147,1665471600"; d="scan'208";a="741932222" Received: from ppkrause-mobl.ger.corp.intel.com (HELO ijarvine-MOBL2.ger.corp.intel.com) ([10.249.44.73]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Nov 2022 04:20:17 -0800 From: =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= To: linux-serial@vger.kernel.org, Greg Kroah-Hartman , Jiri Slaby , Andy Shevchenko , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , linux-kernel@vger.kernel.org Cc: Gilles BULOZ , stable@vger.kernel.org, Wentong Wu Subject: [PATCH v2 3/4] serial: 8250_lpss: Use 16B DMA burst with Elkhart Lake Date: Tue, 8 Nov 2022 14:19:51 +0200 Message-Id: <20221108121952.5497-4-ilpo.jarvinen@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221108121952.5497-1-ilpo.jarvinen@linux.intel.com> References: <20221108121952.5497-1-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. The fix was initially developed by Srikanth Thokala and Aman Kumar. This together with the previous config change is the cleaned up version of the original fix. 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 Signed-off-by: Ilpo J=C3=A4rvinen --- 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 7d9cddbfef40..0e43bdfb7459 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