From patchwork Wed Dec 9 13:03:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudiu Beznea X-Patchwork-Id: 11961311 X-Patchwork-Delegate: kuba@kernel.org 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=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 DB4F0C2BB48 for ; Wed, 9 Dec 2020 13:09:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A72CA233F8 for ; Wed, 9 Dec 2020 13:09:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732113AbgLINF7 (ORCPT ); Wed, 9 Dec 2020 08:05:59 -0500 Received: from esa.microchip.iphmx.com ([68.232.154.123]:25093 "EHLO esa.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732081AbgLINFp (ORCPT ); Wed, 9 Dec 2020 08:05:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1607519145; x=1639055145; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=IKugsm/d3kZD6lpm6POkBOpF9mUABeF8EZuTFUDQaUo=; b=2grcfEtXjkzZkY1ibhWRwGPFy3aHwqIhqLHa24wseeSXou9FYcRWq1Ss Iu9xk2qpC12C/bT7nDjUKN7gO+aioNGvXOrmv77lN8hEPDQa8Lyad0F2h gXho750f9yZgppwVygqB0CJxhgLWAXw6ObRamCnKWgZBFbEPT0qgyv3gj fuHl0Lq0/Z5w3VLNhP0AjrauylzUaLmP99jaz6S8jjp/kvODHTQI83feV WZLBz1eehWSv/2iaZfjdQo/yCLiqnjq6VSR3YWHUz86Ldrf8c/O7hWO2V pTRRvM+avrdYpXqp8FQUP4kTDTh+AOxgmqZlqblLyWHAirZbsdPrYbI+D Q==; IronPort-SDR: 3s+U0c5+Up6XvoxY8cbrMUJYa30W3vZ9MKVXokWp/6GxZEZP7LPDXynQOZB2916ox4j+dYajQa vWpxHlNmiwTGVC1CG395t7HUSXH9Q3/K85BUKI4bsVQbLjd0fVWJoJ5tU48gLCTSQ5AmrX+RvU FlvnO2OQkLhcxZI8rXsmKuusHXC9yLd5Q4AZJKuh/Ef8LMRrBlJRDGp602GoNUEjDj5W8QWz6I yjXRgYx7zcGl2hPJAt9mA1P3K7vm9D7XGfBST1QZZ8mQtKHlZPl5UY/hrJ1hmQa35XrF6WbP1g pNA= X-IronPort-AV: E=Sophos;i="5.78,405,1599548400"; d="scan'208";a="96475108" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa4.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 09 Dec 2020 06:04:05 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Wed, 9 Dec 2020 06:03:58 -0700 Received: from m18063-ThinkPad-T460p.microchip.com (10.10.115.15) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server id 15.1.1979.3 via Frontend Transport; Wed, 9 Dec 2020 06:03:53 -0700 From: Claudiu Beznea To: , , , , , , , , CC: , , , , , , Claudiu Beznea Subject: [PATCH v3 2/8] net: macb: add capability to not set the clock rate Date: Wed, 9 Dec 2020 15:03:33 +0200 Message-ID: <1607519019-19103-3-git-send-email-claudiu.beznea@microchip.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1607519019-19103-1-git-send-email-claudiu.beznea@microchip.com> References: <1607519019-19103-1-git-send-email-claudiu.beznea@microchip.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org SAMA7G5's ethernet IPs TX clock could be provided by its generic clock or by the external clock provided by the PHY. The internal IP logic divides properly this clock depending on the link speed. The patch adds a new capability so that macb_set_tx_clock() to not be called for IPs having this capability (the clock rate, in case of generic clock, is set at the boot time via device tree and the driver only enables it). Signed-off-by: Claudiu Beznea Reviewed-by: Andrew Lunn --- drivers/net/ethernet/cadence/macb.h | 1 + drivers/net/ethernet/cadence/macb_main.c | 18 +++++++++--------- 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h index 7daabffe4318..769694c7f86c 100644 --- a/drivers/net/ethernet/cadence/macb.h +++ b/drivers/net/ethernet/cadence/macb.h @@ -699,6 +699,7 @@ #define MACB_CAPS_GEM_HAS_PTP 0x00000040 #define MACB_CAPS_BD_RD_PREFETCH 0x00000080 #define MACB_CAPS_NEEDS_RSTONUBR 0x00000100 +#define MACB_CAPS_CLK_HW_CHG 0x04000000 #define MACB_CAPS_MACB_IS_EMAC 0x08000000 #define MACB_CAPS_FIFO_MODE 0x10000000 #define MACB_CAPS_GIGABIT_MODE_AVAILABLE 0x20000000 diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index 6d46153a7c4b..b23e986ac6dc 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -460,15 +460,14 @@ static void macb_init_buffers(struct macb *bp) /** * macb_set_tx_clk() - Set a clock to a new frequency - * @clk: Pointer to the clock to change + * @bp: pointer to struct macb * @speed: New frequency in Hz - * @dev: Pointer to the struct net_device */ -static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev) +static void macb_set_tx_clk(struct macb *bp, int speed) { long ferr, rate, rate_rounded; - if (!clk) + if (!bp->tx_clk || !(bp->caps & MACB_CAPS_CLK_HW_CHG)) return; switch (speed) { @@ -485,7 +484,7 @@ static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev) return; } - rate_rounded = clk_round_rate(clk, rate); + rate_rounded = clk_round_rate(bp->tx_clk, rate); if (rate_rounded < 0) return; @@ -495,11 +494,12 @@ static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev) ferr = abs(rate_rounded - rate); ferr = DIV_ROUND_UP(ferr, rate / 100000); if (ferr > 5) - netdev_warn(dev, "unable to generate target frequency: %ld Hz\n", + netdev_warn(bp->dev, + "unable to generate target frequency: %ld Hz\n", rate); - if (clk_set_rate(clk, rate_rounded)) - netdev_err(dev, "adjusting tx_clk failed.\n"); + if (clk_set_rate(bp->tx_clk, rate_rounded)) + netdev_err(bp->dev, "adjusting tx_clk failed.\n"); } static void macb_validate(struct phylink_config *config, @@ -751,7 +751,7 @@ static void macb_mac_link_up(struct phylink_config *config, if (rx_pause) ctrl |= MACB_BIT(PAE); - macb_set_tx_clk(bp->tx_clk, speed, ndev); + macb_set_tx_clk(bp, speed); /* Initialize rings & buffers as clearing MACB_BIT(TE) in link down * cleared the pipeline and control registers.