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 29E26C77B73 for ; Mon, 22 May 2023 19:37:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235014AbjEVTh2 (ORCPT ); Mon, 22 May 2023 15:37:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234980AbjEVThW (ORCPT ); Mon, 22 May 2023 15:37:22 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE4D31BC for ; Mon, 22 May 2023 12:37:09 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8B0DD629A5 for ; Mon, 22 May 2023 19:37:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 95D4CC433EF; Mon, 22 May 2023 19:37:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684784229; bh=xEG9VDstyVHAmm2BjboZPv1h847TxQkuNGGGg/uko/E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sm6qrGimeBPnJP8n3OLzMpjanxcdGPrJZCkXorBlFe/KeaFLhJsjGx1FSQTrijn+1 PxzV3hfMU1EahUlWtGG0XsZjcbhjiDyJg5Zq1OF9o0NvsOqlAIDzFIl2uW4rHgWiR2 Bml6mTwnbLazPtH+4Uj3szLbPzxXYBz3vg8MDr+o= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Marek Vasut , Harald Seiler , Francesco Dolcini , Jesse Brandeburg , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.3 013/364] net: stmmac: Initialize MAC_ONEUS_TIC_COUNTER register Date: Mon, 22 May 2023 20:05:18 +0100 Message-Id: <20230522190413.158569246@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230522190412.801391872@linuxfoundation.org> References: <20230522190412.801391872@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Marek Vasut [ Upstream commit 8efbdbfa99381a017dd2c0f6375a7d80a8118b74 ] Initialize MAC_ONEUS_TIC_COUNTER register with correct value derived from CSR clock, otherwise EEE is unstable on at least NXP i.MX8M Plus and Micrel KSZ9131RNX PHY, to the point where not even ARP request can be sent out. i.MX 8M Plus Applications Processor Reference Manual, Rev. 1, 06/2021 11.7.6.1.34 One-microsecond Reference Timer (MAC_ONEUS_TIC_COUNTER) defines this register as: " This register controls the generation of the Reference time (1 microsecond tic) for all the LPI timers. This timer has to be programmed by the software initially. ... The application must program this counter so that the number of clock cycles of CSR clock is 1us. (Subtract 1 from the value before programming). For example if the CSR clock is 100MHz then this field needs to be programmed to value 100 - 1 = 99 (which is 0x63). This is required to generate the 1US events that are used to update some of the EEE related counters. " The reset value is 0x63 on i.MX8M Plus, which means expected CSR clock are 100 MHz. However, the i.MX8M Plus "enet_qos_root_clk" are 266 MHz instead, which means the LPI timers reach their count much sooner on this platform. This is visible using a scope by monitoring e.g. exit from LPI mode on TX_CTL line from MAC to PHY. This should take 30us per STMMAC_DEFAULT_TWT_LS setting, during which the TX_CTL line transitions from tristate to low, and 30 us later from low to high. On i.MX8M Plus, this transition takes 11 us, which matches the 30us * 100/266 formula for misconfigured MAC_ONEUS_TIC_COUNTER register. Configure MAC_ONEUS_TIC_COUNTER based on CSR clock, so that the LPI timers have correct 1us reference. This then fixes EEE on i.MX8M Plus with Micrel KSZ9131RNX PHY. Fixes: 477286b53f55 ("stmmac: add GMAC4 core support") Signed-off-by: Marek Vasut Tested-by: Harald Seiler Reviewed-by: Francesco Dolcini Tested-by: Francesco Dolcini # Toradex Verdin iMX8MP Reviewed-by: Jesse Brandeburg Link: https://lore.kernel.org/r/20230506235845.246105-1-marex@denx.de Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/stmicro/stmmac/dwmac4.h | 1 + drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h index ccd49346d3b30..a70b0d8a622d6 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h @@ -181,6 +181,7 @@ enum power_event { #define GMAC4_LPI_CTRL_STATUS 0xd0 #define GMAC4_LPI_TIMER_CTRL 0xd4 #define GMAC4_LPI_ENTRY_TIMER 0xd8 +#define GMAC4_MAC_ONEUS_TIC_COUNTER 0xdc /* LPI control and status defines */ #define GMAC4_LPI_CTRL_STATUS_LPITCSE BIT(21) /* LPI Tx Clock Stop Enable */ diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c index 36251ec2589c9..24d6ec06732d9 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c @@ -25,6 +25,7 @@ static void dwmac4_core_init(struct mac_device_info *hw, struct stmmac_priv *priv = netdev_priv(dev); void __iomem *ioaddr = hw->pcsr; u32 value = readl(ioaddr + GMAC_CONFIG); + u32 clk_rate; value |= GMAC_CORE_INIT; @@ -47,6 +48,10 @@ static void dwmac4_core_init(struct mac_device_info *hw, writel(value, ioaddr + GMAC_CONFIG); + /* Configure LPI 1us counter to number of CSR clock ticks in 1us - 1 */ + clk_rate = clk_get_rate(priv->plat->stmmac_clk); + writel((clk_rate / 1000000) - 1, ioaddr + GMAC4_MAC_ONEUS_TIC_COUNTER); + /* Enable GMAC interrupts */ value = GMAC_INT_DEFAULT_ENABLE; -- 2.39.2