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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no 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 3EAEFC3402A for ; Mon, 17 Feb 2020 21:08:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1C0F620725 for ; Mon, 17 Feb 2020 21:08:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729903AbgBQVI5 (ORCPT ); Mon, 17 Feb 2020 16:08:57 -0500 Received: from bhuna.collabora.co.uk ([46.235.227.227]:44384 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728444AbgBQVI5 (ORCPT ); Mon, 17 Feb 2020 16:08:57 -0500 Received: from localhost (unknown [IPv6:2a01:e0a:2c:6930:5cf4:84a1:2763:fe0d]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: bbrezillon) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id A9460293C50; Mon, 17 Feb 2020 21:08:55 +0000 (GMT) Date: Mon, 17 Feb 2020 22:08:52 +0100 From: Boris Brezillon To: Dominik Brodowski Cc: narmstrong@baylibre.com, laurent.pinchart@ideasonboard.com, jernej.skrabec@siol.net, jonas@kwiboo.se, linux-kernel@vger.kernel.org Subject: Re: drm/bridge and lockup on boot Message-ID: <20200217220852.55cbac43@collabora.com> In-Reply-To: <20200217200942.GA2433@light.dominikbrodowski.net> References: <20200217200942.GA2433@light.dominikbrodowski.net> Organization: Collabora X-Mailer: Claws Mail 3.17.4 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 17 Feb 2020 21:09:42 +0100 Dominik Brodowski wrote: > On my old Dell XPS 13 laptop with > > 00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09) > 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09) (prog-if 00 [VGA controller]) > > booting 5.6-rc1 and -rc2 fails after the dmesg line > > fb0: switching to inteldrmfb from simple > > while the next lines should be something like (v5.5): > > Console: switching to colour dummy device 80x25 > i915 0000:00:02.0: vgaarb: deactivate vga console > [drm] ACPI BIOS requests an excessive sleep of 25000 ms, using 1500 ms instead > [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). > [drm] Driver supports precise vblank timestamp query. > i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem > > A git bisect lead to > > commit b86d895524ab ("drm/bridge: Add an ->atomic_check() hook") This commit has been reverted: you should ignore any failures between b86d895524ab ("drm/bridge: Add an ->atomic_check() hook") and 099126352303 ("Revert "drm/bridge: Add a drm_bridge_state object"). > > as the first bad commit, as unlikely as that sounds. f7619a58ef92 is good, > as is bf046007641a, and 3cacb2086e41 is definitely broken on my setup. > Any ideas? > > Oh, and this might be the same issue as reported here: > > https://lore.kernel.org/lkml/99fb887f-4a1b-6c15-64a6-9d089773cdd4@4net.rs/ > > though I do not see such a warning, but nothing new once the line "fb0: switching > to inteldrmfb from simple" is printed. > > Thanks, > Dominik