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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21DC6C4167B for ; Wed, 21 Dec 2022 15:26:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234684AbiLUP01 (ORCPT ); Wed, 21 Dec 2022 10:26:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234641AbiLUP0B (ORCPT ); Wed, 21 Dec 2022 10:26:01 -0500 Received: from mail-ed1-x52b.google.com (mail-ed1-x52b.google.com [IPv6:2a00:1450:4864:20::52b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5028815829 for ; Wed, 21 Dec 2022 07:25:53 -0800 (PST) Received: by mail-ed1-x52b.google.com with SMTP id i15so22508944edf.2 for ; Wed, 21 Dec 2022 07:25:53 -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=l41KMmbZ167AwdM3fjtskgTgOQAD6k/gmKgP2JjeSuo=; b=4OB2I3tYmsRBUZNhYofMKCKmoNI6xPhNUXFV8al/t4QzEmrkbBStccpNMk7ol0te7O +rcqpFb1Ta0dUoXP73+whP8SeKRo0jgHLsXujiIXnvPSreMPugYWo8aLge1WxZss+M+u Bv7C5lu3//oWQ+rXwOZ0MSHUf4d9KoM73wUCwTzJzT+B1Hz/SJ6k19J//0dXJ32Bd5IP 3hlFPuTWTH6iiyVnVKYGMnTo/RkTifZNNRJveyvl23q6XqDay5QtiCV6yGyb1F7JaKMR So9ND/Km44lWkOLdDpblVkSACkAogzIf7jaJE3i0M8aUqBzqfsUXTaV9Vp8Ukg+6mAr1 Umcg== 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=l41KMmbZ167AwdM3fjtskgTgOQAD6k/gmKgP2JjeSuo=; b=1qjk3PUnfZqBJPzYshAWyVa4VK6G1PA0VqfmSoSleMRyqudPpdxILAW7drYvUq8Fib ABHXhis7AWbgtbn1GG9ndrvxGutThPAIISUJTKCmRZb0FdpJJcax4+iHlEUlbFQEZSay QS5Ub9S52o4F+6Ct99aVdk0qU2Vwih5pc5GPFTRrnyvPBjY4zCrcFupuDMpmPSfgR0SZ KslsNdAUfwLDMPuJGSXmq/CE93hBgn9FZrt33WLtt3oywTtFQxisnQko3MecYiHWgjM8 BiLiDJ93CGcGIKRbHqSgAchnJT6iCJGuLR4s87xYspwr+FNngRTDFaJ9FmHPWBk7/3Da YfZQ== X-Gm-Message-State: AFqh2krTA/9Rk/I8P2dl2sdcBcv2Ter6bNCbDCrit8n2I8giVhDspg+/ KIJ+VeI7sG1306WKV5q7L6il9A== X-Google-Smtp-Source: AMrXdXsNI6CVAxTDlHMb6s0lavRi40Yfp8rRvWUFHoe8RYEumH8HQ7BH2o2CWsoQtIR/fsKRcJNXOQ== X-Received: by 2002:a05:6402:7ca:b0:470:39d2:24c5 with SMTP id u10-20020a05640207ca00b0047039d224c5mr1869091edy.35.1671636352881; Wed, 21 Dec 2022 07:25:52 -0800 (PST) Received: from blmsp.fritz.box ([2001:4091:a245:805c:8713:84e4:2a9e:cbe8]) by smtp.gmail.com with ESMTPSA id n19-20020aa7c793000000b0045cf4f72b04sm7105428eds.94.2022.12.21.07.25.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Dec 2022 07:25:52 -0800 (PST) From: Markus Schneider-Pargmann To: Marc Kleine-Budde , Chandrasekar Ramakrishnan , Wolfgang Grandegger Cc: Vincent MAILHOL , linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Markus Schneider-Pargmann Subject: [PATCH 13/18] can: m_can: Cache tx putidx Date: Wed, 21 Dec 2022 16:25:32 +0100 Message-Id: <20221221152537.751564-14-msp@baylibre.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221221152537.751564-1-msp@baylibre.com> References: <20221221152537.751564-1-msp@baylibre.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-can@vger.kernel.org m_can_tx_handler is the only place where data is written to the tx fifo. We can calculate the putidx in the driver code here to avoid the dependency on the txfqs register. Signed-off-by: Markus Schneider-Pargmann --- drivers/net/can/m_can/m_can.c | 8 +++++++- drivers/net/can/m_can/m_can.h | 3 +++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index fc5a269f4930..5b882c2fec52 100644 --- a/drivers/net/can/m_can/m_can.c +++ b/drivers/net/can/m_can/m_can.c @@ -1452,6 +1452,10 @@ static void m_can_start(struct net_device *dev) cdev->can.state = CAN_STATE_ERROR_ACTIVE; m_can_enable_all_interrupts(cdev); + + if (cdev->version > 30) + cdev->tx_fifo_putidx = FIELD_GET(TXFQS_TFQPI_MASK, + m_can_read(cdev, M_CAN_TXFQS)); } static int m_can_set_mode(struct net_device *dev, enum can_mode mode) @@ -1740,7 +1744,7 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev) } /* get put index for frame */ - putidx = FIELD_GET(TXFQS_TFQPI_MASK, txfqs); + putidx = cdev->tx_fifo_putidx; /* Construct DLC Field, with CAN-FD configuration. * Use the put index of the fifo as the message marker, @@ -1773,6 +1777,8 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev) /* Enable TX FIFO element to start transfer */ m_can_write(cdev, M_CAN_TXBAR, (1 << putidx)); + cdev->tx_fifo_putidx = (++cdev->tx_fifo_putidx >= cdev->can.echo_skb_max ? + 0 : cdev->tx_fifo_putidx); /* stop network queue if fifo full */ if (m_can_tx_fifo_full(cdev) || diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h index 62631a613076..185289a3719c 100644 --- a/drivers/net/can/m_can/m_can.h +++ b/drivers/net/can/m_can/m_can.h @@ -102,6 +102,9 @@ struct m_can_classdev { u32 tx_max_coalesced_frames_irq; u32 tx_coalesce_usecs_irq; + // Store this internally to avoid fetch delays on peripheral chips + int tx_fifo_putidx; + struct mram_cfg mcfg[MRAM_CFG_NUM]; }; -- 2.38.1