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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 60959C28CBC for ; Thu, 30 Apr 2020 14:02:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3C716206D9 for ; Thu, 30 Apr 2020 14:02:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588255330; bh=N5kQtHnfbZR6ujyLKKZvN4ndgmsr8nvsHRD5vWXj018=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hLMA3KnhP9cCNjSnFRyCI3oDGZxmhdSKuzhm+HIHkgtNOvvstDz1CTM4XS+gC9rdk +mBMlVZ/v3JFTBhmbPnGjz8j1q3/Y4spenlPRGsOOs8yHusGB1u55+uECJJgxyHg4m 9ryYRChAtZ3iHPAZT8XTBOsdRPEETbrIrSUdnB7A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729027AbgD3OCI (ORCPT ); Thu, 30 Apr 2020 10:02:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:35666 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728791AbgD3Nxp (ORCPT ); Thu, 30 Apr 2020 09:53:45 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6466120870; Thu, 30 Apr 2020 13:53:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588254825; bh=N5kQtHnfbZR6ujyLKKZvN4ndgmsr8nvsHRD5vWXj018=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mGGgt0LUy/zx/qH7p5GUk2rUpBmOZOYEcELpNBiylLhgNJtM4FfKCZMKXGaxWslJI zFI3v7viglhlI6WTydIi/8CJ3hWIda2qAEd1CoExoSliDOSk1dKy9Alq01Ffsr0wDm G/Q6hzAc2EwAFnAVyxEareT5SOvTyFyF1ja2L15M= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Julien Beraud , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 17/30] net: stmmac: Fix sub-second increment Date: Thu, 30 Apr 2020 09:53:12 -0400 Message-Id: <20200430135325.20762-17-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200430135325.20762-1-sashal@kernel.org> References: <20200430135325.20762-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Julien Beraud [ Upstream commit 91a2559c1dc5b0f7e1256d42b1508935e8eabfbf ] In fine adjustement mode, which is the current default, the sub-second increment register is the number of nanoseconds that will be added to the clock when the accumulator overflows. At each clock cycle, the value of the addend register is added to the accumulator. Currently, we use 20ns = 1e09ns / 50MHz as this value whatever the frequency of the ptp clock actually is. The adjustment is then done on the addend register, only incrementing every X clock cycles X being the ratio between 50MHz and ptp_clock_rate (addend = 2^32 * 50MHz/ptp_clock_rate). This causes the following issues : - In case the frequency of the ptp clock is inferior or equal to 50MHz, the addend value calculation will overflow and the default addend value will be set to 0, causing the clock to not work at all. (For instance, for ptp_clock_rate = 50MHz, addend = 2^32). - The resolution of the timestamping clock is limited to 20ns while it is not needed, thus limiting the accuracy of the timestamping to 20ns. Fix this by setting sub-second increment to 2e09ns / ptp_clock_rate. It will allow to reach the minimum possible frequency for ptp_clk_ref, which is 5MHz for GMII 1000Mps Full-Duplex by setting the sub-second-increment to a higher value. For instance, for 25MHz, it gives ssinc = 80ns and default_addend = 2^31. It will also allow to use a lower value for sub-second-increment, thus improving the timestamping accuracy with frequencies higher than 100MHz, for instance, for 200MHz, ssinc = 10ns and default_addend = 2^31. v1->v2: - Remove modifications to the calculation of default addend, which broke compatibility with clock frequencies for which 2000000000 / ptp_clk_freq is not an integer. - Modify description according to discussions. Signed-off-by: Julien Beraud Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- .../net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c index 7423262ce5907..e1fbd7c81bfa9 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c @@ -36,12 +36,16 @@ static void config_sub_second_increment(void __iomem *ioaddr, unsigned long data; u32 reg_value; - /* For GMAC3.x, 4.x versions, convert the ptp_clock to nano second - * formula = (1/ptp_clock) * 1000000000 - * where ptp_clock is 50MHz if fine method is used to update system + /* For GMAC3.x, 4.x versions, in "fine adjustement mode" set sub-second + * increment to twice the number of nanoseconds of a clock cycle. + * The calculation of the default_addend value by the caller will set it + * to mid-range = 2^31 when the remainder of this division is zero, + * which will make the accumulator overflow once every 2 ptp_clock + * cycles, adding twice the number of nanoseconds of a clock cycle : + * 2000000000ULL / ptp_clock. */ if (value & PTP_TCR_TSCFUPDT) - data = (1000000000ULL / 50000000); + data = (2000000000ULL / ptp_clock); else data = (1000000000ULL / ptp_clock); -- 2.20.1