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=-6.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_NEOMUTT 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 081DDC43441 for ; Fri, 16 Nov 2018 10:53:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B3642208A3 for ; Fri, 16 Nov 2018 10:53:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linaro.org header.i=@linaro.org header.b="HRKqXA5T" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B3642208A3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727769AbeKPVFL (ORCPT ); Fri, 16 Nov 2018 16:05:11 -0500 Received: from mail-pl1-f195.google.com ([209.85.214.195]:41548 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727490AbeKPVFL (ORCPT ); Fri, 16 Nov 2018 16:05:11 -0500 Received: by mail-pl1-f195.google.com with SMTP id u6so120091plm.8 for ; Fri, 16 Nov 2018 02:53:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=Ub0jFUuuOXY4BS8hjw1KlbGzgantkBulGj3poKRf0ys=; b=HRKqXA5TvZc5kW2FKbWKBFikuMMpg4tEFBVHEY7EWmPAkdfXtbWagcU6/s539Vbmpa HZ95tFgKPh8Rz7CqCCLNmGfB+rrKmyxG5183QLpm5DbM/05CyM/4M3zqW3RL5KTAcij+ DOT1drtR6k/NR1fsIJ85kh8uXpeloVCi7ZdhI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=Ub0jFUuuOXY4BS8hjw1KlbGzgantkBulGj3poKRf0ys=; b=j1u9sl5CiL1Czauj1jg50sONZdzG8R/t31JiW6cwlGiBvZoYs7vjWzNUcQoFiIjyZV SH8+iVh2ojGKS2Mha9kOsrgW++zFOV82XNqSrkUWDcsNO+bDs9Ma8dLromCRknI2iTwg uYal8TSNrcDDQ/6qemu9PisdgamRamfD11LqhXnY4GcSsoKJu3uGapuWiUcsm/S3dsAO WsffCdwQCLAEo+kP5IPVZAqpfgvzH9qAoUPVDOExVyMcvjpHykcCs6VCKrt+Hk6NJisE XFXKEdoBcFPfE8bGthPaC8WrWfLQwGPeso6IPUvoOqxjdD94rFu8Li2fNrHre7rO4Hy3 yCOw== X-Gm-Message-State: AGRZ1gJMZsmkA7qnK65yLi+4TPwhNsQjjhAQdYY9yjSPifbj+rilbt4Y W/gVjOE0pBUjxvxejOHabiKN5w== X-Google-Smtp-Source: AJdET5c0BcGQk3STSkZJDaKg+Cn96E3MyK0MCnzRjfl+dTuwMYFF9NHZAu/hlRXOFdV66qsiOKteEQ== X-Received: by 2002:a17:902:8a88:: with SMTP id p8-v6mr10059772plo.94.1542365601696; Fri, 16 Nov 2018 02:53:21 -0800 (PST) Received: from localhost ([122.172.88.116]) by smtp.gmail.com with ESMTPSA id n23-v6sm52345775pfg.84.2018.11.16.02.53.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 16 Nov 2018 02:53:20 -0800 (PST) Date: Fri, 16 Nov 2018 16:23:17 +0530 From: Viresh Kumar To: Sai Prakash Ranjan Cc: Viresh Kumar , srinivas.kandagatla@linaro.org, Stephen Boyd , Michael Turquette , Steven Rostedt , Rob Herring , Joel Fernandes , Rajendra Nayak , Greg Kroah-Hartman , Vivek Gautam , Sibi Sankar , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org Subject: Re: [PATCH] boot_constraint: Add constraints for earlycon on dragonboard 410c Message-ID: <20181116105317.5zpbzhgt5cnssuki@vireshk-i7> References: <20181116104607.26671-1-saiprakash.ranjan@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181116104607.26671-1-saiprakash.ranjan@codeaurora.org> User-Agent: NeoMutt/20180323-120-3dd1ac Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 16-11-18, 16:16, Sai Prakash Ranjan wrote: > iface clock is shared with other drivers, which may reconfigure > this before the serial driver comes up. This may lead to > crashes like the one below where GCC_BLSP1_AHB_CLK is same across > multiple drivers like bam dma. > > <0>[ 3.164471] Internal error: synchronous external abort: 96000010 [#1] PREEMPT SMP > <4>[ 3.164479] Modules linked in: > <4>[ 3.164495] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.19.0-rc8-00008-ge033b9909fff-dirty #175 > <4>[ 3.164501] Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT) > <4>[ 3.164508] pstate: 40000085 (nZcv daIf -PAN -UAO) > <4>[ 3.164514] pc : msm_read.isra.2+0x20/0x50 > <4>[ 3.164520] lr : msm_read.isra.2+0x1c/0x50 > <4>[ 3.164526] sp : ffff000008033a50 > <4>[ 3.164531] x29: ffff000008033a50 x28: ffff000009486018 > <4>[ 3.164548] x27: 0000000000000001 x26: ffff7dfffe7ff070 > <4>[ 3.164565] x25: 0000000000000034 x24: ffff000009486000 > <4>[ 3.164582] x23: 0000000000000000 x22: ffff00000978e190 > <4>[ 3.164599] x21: ffff0000095e8228 x20: 0000000000000034 > <4>[ 3.164616] x19: ffff7dfffe7ff008 x18: ffffffffffffffff > <4>[ 3.164632] x17: 0000000000000000 x16: 0000000000000000 > <4>[ 3.164649] x15: ffff0000094a96c8 x14: ffff00008978e6bf > <4>[ 3.164666] x13: ffff00000978e6cd x12: 0000000000000038 > <4>[ 3.164683] x11: ffff0000094c6000 x10: 0000000000000c24 > <4>[ 3.164699] x9 : ffff80003c89b400 x8 : ffff000008033970 > <4>[ 3.164716] x7 : ffff80000eb04100 x6 : 00000000000af304 > <4>[ 3.164732] x5 : 0000000000000c40 x4 : ffff80003c06f000 > <4>[ 3.164750] x3 : ffff80003c89b498 x2 : 0000000000000000 > <4>[ 3.164766] x1 : ffff80003ca68000 x0 : 0000000000000800 > <0>[ 3.164785] Process swapper/0 (pid: 1, stack limit = 0x(____ptrval____)) > <4>[ 3.164791] Call trace: > <4>[ 3.164797] msm_read.isra.2+0x20/0x50 > <4>[ 3.164804] msm_reset_dm_count+0x44/0x80 > <4>[ 3.164810] __msm_console_write+0x1c8/0x1d0 > <4>[ 3.164816] msm_serial_early_write_dm+0x3c/0x50 > <4>[ 3.164823] console_unlock.part.6+0x468/0x528 > <4>[ 3.164829] vprintk_emit+0x210/0x218 > <4>[ 3.164835] vprintk_default+0x48/0x58 > <4>[ 3.164841] vprintk_func+0xf0/0x1c0 > <4>[ 3.164847] printk+0x74/0x94 > <4>[ 3.164853] sci_init+0x24/0x3c > <4>[ 3.164859] do_one_initcall+0x54/0x248 > <4>[ 3.164866] kernel_init_freeable+0x210/0x378 > <4>[ 3.164872] kernel_init+0x18/0x118 > <4>[ 3.164878] ret_from_fork+0x10/0x1c > <0>[ 3.164884] Code: aa1e03e0 8b214273 97e616f7 d503201f (b9400260) > > Link: https://lore.kernel.org/lkml/1cae8f10-55f5-20ce-9105-30af6f88bd6e@codeaurora.org/ > Signed-off-by: Sai Prakash Ranjan > > --- > > This is purely dependent on boot constraint subsystem by Viresh. > > Link: https://lore.kernel.org/lkml/cover.1519380923.git.viresh.kumar@linaro.org/ > --- > drivers/soc/qcom/boot_constraint.c | 15 +++++++++++++++ > 1 file changed, 15 insertions(+) Nice to see that the new subsystem has fixed your issue as well and thanks for the patch. I am afraid though that this patch isn't going to get merged anywhere as the subsystem isn't merged yet as Greg wasn't too confident [1] about it. We are looking for more use-cases apart from earlycon and clcd. Thanks. -- viresh [1] lore.kernel.org/lkml/20180323150420.GA21152@kroah.com