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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 D7EDFC433E3 for ; Mon, 17 Aug 2020 15:56:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9FED12072E for ; Mon, 17 Aug 2020 15:56:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597679802; bh=CD3HPUADLYe44TSi72mJmigB4TKXwZYje3mQ+Tm1oJA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=zT1wBJN1J4uVS3ziWhC/wujDnIsMM02jXab+Z4T0VLMiLo9e9zMC/vRv9pH8+1tFE 4dsIg/Ef7C89+E+Zy6ZHues+jQUZHpFCCjMd42QAHCyG8RBU+A/HEy0OqiAd7s8sH+ whlyYMlCuZILdR1U/W+pBbQcv7cnIlcoYg+0Yx0E= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388081AbgHQP4d (ORCPT ); Mon, 17 Aug 2020 11:56:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:51940 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387495AbgHQPmF (ORCPT ); Mon, 17 Aug 2020 11:42:05 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3E68520760; Mon, 17 Aug 2020 15:42:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597678924; bh=CD3HPUADLYe44TSi72mJmigB4TKXwZYje3mQ+Tm1oJA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=v83lhnPY1j6HLNuyItSKz5YU5ixvLYt7sQmQjat2ehKC5P7hwEw6tBW2BNzde+eJP mcrHsGl5CUKa26scHToMZc+3vhzDVuLU9JGOg+2ip2DvgjE5JZy7ZOA44Mv9Z2eHQT FCUlBQFZRYjyikQS4xFWS8b5T1dbI4XTmOKM11Qw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Willy Wolff , Marek Szyprowski , Krzysztof Kozlowski , Sasha Levin Subject: [PATCH 5.7 037/393] ARM: dts: exynos: Disable frequency scaling for FSYS bus on Odroid XU3 family Date: Mon, 17 Aug 2020 17:11:27 +0200 Message-Id: <20200817143821.406953057@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200817143819.579311991@linuxfoundation.org> References: <20200817143819.579311991@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marek Szyprowski [ Upstream commit 9ff416cf45a08f28167b75045222c762a0347930 ] Commit 1019fe2c7280 ("ARM: dts: exynos: Adjust bus related OPPs to the values correct for Exynos5422 Odroids") changed the parameters of the OPPs for the FSYS bus. Besides the frequency adjustments, it also removed the 'shared-opp' property from the OPP table used for FSYS_APB and FSYS busses. This revealed that in fact the FSYS bus frequency scaling never worked. When one OPP table is marked as 'opp-shared', only the first bus which selects the OPP sets the rate of its clock. Then OPP core assumes that the other busses have been changed to that OPP and no change to their clock rates are needed. Thus when FSYS_APB bus, which was registered first, set the rate for its clock, the OPP core did not change the FSYS bus clock later. The mentioned commit removed that behavior, what introduced a regression on some Odroid XU3 boards. Frequency scaling of the FSYS bus causes instability of the USB host operation, what can be observed as network hangs. To restore old behavior, simply disable frequency scaling for the FSYS bus. Reported-by: Willy Wolff Fixes: 1019fe2c7280 ("ARM: dts: exynos: Adjust bus related OPPs to the values correct for Exynos5422 Odroids") Signed-off-by: Marek Szyprowski Signed-off-by: Krzysztof Kozlowski Signed-off-by: Sasha Levin --- arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 6 ------ 1 file changed, 6 deletions(-) diff --git a/arch/arm/boot/dts/exynos5422-odroid-core.dtsi b/arch/arm/boot/dts/exynos5422-odroid-core.dtsi index ab27ff8bc3dca..afe090578e8fa 100644 --- a/arch/arm/boot/dts/exynos5422-odroid-core.dtsi +++ b/arch/arm/boot/dts/exynos5422-odroid-core.dtsi @@ -411,12 +411,6 @@ &bus_fsys_apb { status = "okay"; }; -&bus_fsys { - operating-points-v2 = <&bus_fsys2_opp_table>; - devfreq = <&bus_wcore>; - status = "okay"; -}; - &bus_fsys2 { operating-points-v2 = <&bus_fsys2_opp_table>; devfreq = <&bus_wcore>; -- 2.25.1