From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757247AbbCCUgM (ORCPT ); Tue, 3 Mar 2015 15:36:12 -0500 Received: from mail-pa0-f52.google.com ([209.85.220.52]:36080 "EHLO mail-pa0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755528AbbCCUgK (ORCPT ); Tue, 3 Mar 2015 15:36:10 -0500 From: Kevin Hilman To: Javier Martinez Canillas Cc: Kukjin Kim , Olof Johansson , Marek Szyprowski , Krzysztof Kozlowski , Andreas Faerber , linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, tyler.baker@linaro.org Subject: Re: [PATCH 1/1] ARM: exynos_defconfig: Disable IOMMU support In-Reply-To: <1424173109-30347-1-git-send-email-javier.martinez@collabora.co.uk> (Javier Martinez Canillas's message of "Tue, 17 Feb 2015 12:38:29 +0100") References: <1424173109-30347-1-git-send-email-javier.martinez@collabora.co.uk> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) Date: Tue, 03 Mar 2015 12:36:08 -0800 Message-ID: <7hioehu8cn.fsf@linaro.org> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Javier Martinez Canillas writes: > Enabling Exynos DRM IOMMU support for Exynos is currently broken and > causes a BUG on exynos-iommu driver. This was not an issue since the > options was disabled in exynos_defconfig but after commit 8dcc14f82f06 > ("drm/exynos: IOMMU support should not be selectable by user"), it is > selected if EXYNOS_IOMMU is enabled which is in exynos_defconfig. > > So a kernel built using exynos_defconfig after the mentioned commit > fails to boot [0]. Disable IOMMU support in Exynos defconfig until > things get sorted out. So some other exynos boards started failing in next-20150303[1], and appear are DRM failures. Interestingly, (re)enabling CONFIG_EXYNOS_IOMMU for these cause things to work again. Even more intersting, with IOMMU enabled, peach-pi is I'm starting to think it's the DRM driver that needs to be disabled until it actually gets some testing, rathre than disabling IOMMU. Kevin [1] http://kernelci.org/boot/?next-20150303&fail