From nobody Fri Dec 19 08:05:52 2025 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 D2A54C352A1 for ; Tue, 6 Dec 2022 11:58:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234300AbiLFL6W (ORCPT ); Tue, 6 Dec 2022 06:58:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235163AbiLFL5q (ORCPT ); Tue, 6 Dec 2022 06:57:46 -0500 Received: from mail-ej1-x62d.google.com (mail-ej1-x62d.google.com [IPv6:2a00:1450:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 75C7B6596 for ; Tue, 6 Dec 2022 03:57:43 -0800 (PST) Received: by mail-ej1-x62d.google.com with SMTP id kw15so2151749ejc.10 for ; Tue, 06 Dec 2022 03:57:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=83PP3edth58TA8zB8E6Zh9GJd+Ky/ClAFIA3P8EFVEY=; b=ZmTzsvSEnQugnHmiOGpzBOFBYadRAHO8P94h8wRpc1ocO2mItjUJ8G2A2g1bg+aTxK qq/xGf0lhP9cuieUkkAAwVo1YGNexSDz4Y7524SetLJMGRPR1vqCD9LToU/YragnTqwa +GH5ZUrt2jJne1PAd0Fkh4L2kx0h4QnHM2ZrZm2OLzt++l2OaOCJuUW8L11kUwA4ZG9e fZoJl+oM0J7F+8P6/EMwvwIv6X5Dwo1HiRybxLpPB9V/LdijGr7UwhjZLgsY+VKngPWH WKWI72MG8U6NadKKD2SMTaZDziV4kUvYNJKZFIRxopvc4W9XvQDQB6YfamHcH+QVPuIj B3Gg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=83PP3edth58TA8zB8E6Zh9GJd+Ky/ClAFIA3P8EFVEY=; b=xCEUgAqdDzjrSuFiw1cV47DizEIWML3yTHbmYjUUO5jfKZ2bx6cixNqNL1FRrADyhT NncWpDXt8IHwXP+XwCBCbUlmkQl8ouxGZlyBwNc1XhelG221rm25quFplJG9vkwHi3Yo sYvf850Vlalx76OX/TITcum6vJ6VUbLApWbs4JL3obUf2Bt5lZrgfWcgCSlP1UpcEmPO ZbEBRgziRl4HRatCoYTSIeoHScZAchPSaDBNWQfkmpHu+c86ok3xT2Wnk8RrV0n3qKT2 xcfYtKl761IU7veDKTHC3qhU/gyit0tyFik+Fd83UxyCqYOH+r2OsyPjkFRCOeSaW6HA FCcw== X-Gm-Message-State: ANoB5plBbl9iO8zQd8BEY3F/J3Jx/vxwm1LWE3oa77tJ1Mxx6b34mLe0 hwwwCPqrKgOhUTtGpU88yDpaag== X-Google-Smtp-Source: AA0mqf56KMKwHGEPqLdvA1xeKZO3WSzbx+Hrig6h2oxmyp3nkUwQmFWl3nop/IYAJYnzUEu2T7QIew== X-Received: by 2002:a17:906:2851:b0:78d:88c7:c1bf with SMTP id s17-20020a170906285100b0078d88c7c1bfmr57231518ejc.299.1670327861708; Tue, 06 Dec 2022 03:57:41 -0800 (PST) Received: from blmsp.fritz.box ([2001:4091:a245:805c:8713:84e4:2a9e:cbe8]) by smtp.gmail.com with ESMTPSA id ky20-20020a170907779400b007c0ac4e6b6esm6472076ejc.143.2022.12.06.03.57.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Dec 2022 03:57:41 -0800 (PST) From: Markus Schneider-Pargmann To: Chandrasekar Ramakrishnan , Marc Kleine-Budde , Wolfgang Grandegger Cc: linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Markus Schneider-Pargmann Subject: [PATCH v2 07/11] can: m_can: Batch acknowledge rx fifo Date: Tue, 6 Dec 2022 12:57:24 +0100 Message-Id: <20221206115728.1056014-8-msp@baylibre.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221206115728.1056014-1-msp@baylibre.com> References: <20221206115728.1056014-1-msp@baylibre.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Instead of acknowledging every item of the fifo, only acknowledge the last item read. This behavior is documented in the datasheet. The new getindex will be the acknowledged item + 1. Signed-off-by: Markus Schneider-Pargmann --- drivers/net/can/m_can/m_can.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 5572a6b3b94c..56f07f2023dd 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -529,9 +529,6 @@ static int m_can_read_fifo(struct net_device *dev, u32 = fgi) } stats->rx_packets++; =20 - /* acknowledge rx fifo 0 */ - m_can_write(cdev, M_CAN_RXF0A, fgi); - timestamp =3D FIELD_GET(RX_BUF_RXTS_MASK, fifo_header.dlc) << 16; =20 m_can_receive_skb(cdev, skb, timestamp); @@ -552,8 +549,9 @@ static int m_can_do_rx_poll(struct net_device *dev, int= quota) u32 rxfs; u32 rx_count; u32 fgi; + int ack_fgi =3D -1; int i; - int err; + int err =3D 0; =20 rxfs =3D m_can_read(cdev, M_CAN_RXF0S); if (!(rxfs & RXFS_FFL_MASK)) { @@ -567,13 +565,20 @@ static int m_can_do_rx_poll(struct net_device *dev, i= nt quota) for (i =3D 0; i < rx_count && quota > 0; ++i) { err =3D m_can_read_fifo(dev, fgi); if (err) - return err; + break; =20 quota--; pkts++; + ack_fgi =3D fgi; fgi =3D (++fgi >=3D cdev->mcfg[MRAM_RXF0].num ? 0 : fgi); } =20 + if (ack_fgi !=3D -1) + m_can_write(cdev, M_CAN_RXF0A, ack_fgi); + + if (err) + return err; + return pkts; } =20 --=20 2.38.1