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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 2B73DC43332 for ; Wed, 23 Dec 2020 15:34:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 04EC823435 for ; Wed, 23 Dec 2020 15:34:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728452AbgLWPeJ (ORCPT ); Wed, 23 Dec 2020 10:34:09 -0500 Received: from mail.kernel.org ([198.145.29.99]:44942 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726558AbgLWPeG (ORCPT ); Wed, 23 Dec 2020 10:34:06 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 350FB2337F; Wed, 23 Dec 2020 15:33:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1608737586; bh=00Q9qhWdSO+2oz2mWhLCyHmpYgRrjVthSubvHaP/amE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=X/oodU3aWezrb8Z8sCNKBMuG5pFTKetdVrb67MioN8AIxuvDQRzrS7W56vuFaHo4x /diGwtWIQXZid1wUN2XvIMfrlfI2AMcxCsH0M6IvpJMI6TSqvl75HIBa9OS/UXJmqG gzAYKCQCD1xxgkF8fRUwrp76p7+ikK4B3r7mFy9Q= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Suzuki K Poulose , Sai Prakash Ranjan , Mathieu Poirier Subject: [PATCH 5.10 19/40] coresight: etm4x: Skip setting LPOVERRIDE bit for qcom, skip-power-up Date: Wed, 23 Dec 2020 16:33:20 +0100 Message-Id: <20201223150516.474876503@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201223150515.553836647@linuxfoundation.org> References: <20201223150515.553836647@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sai Prakash Ranjan commit ac0f82b1b4956e348a6b2de8104308144ffb6ef7 upstream. There is a bug on the systems supporting to skip power up (qcom,skip-power-up) where setting LPOVERRIDE bit(low-power state override behaviour) will result in CPU hangs/lockups even on the implementations which supports it. So skip setting the LPOVERRIDE bit for such platforms. Fixes: 02510a5aa78d ("coresight: etm4x: Add support to skip trace unit power up") Cc: stable@vger.kernel.org Reviewed-by: Suzuki K Poulose Signed-off-by: Sai Prakash Ranjan Signed-off-by: Mathieu Poirier Link: https://lore.kernel.org/r/20201127175256.1092685-2-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/coresight/coresight-etm4x-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -779,7 +779,7 @@ static void etm4_init_arch_data(void *in * LPOVERRIDE, bit[23] implementation supports * low-power state override */ - if (BMVAL(etmidr5, 23, 23)) + if (BMVAL(etmidr5, 23, 23) && (!drvdata->skip_power_up)) drvdata->lpoverride = true; else drvdata->lpoverride = false;