From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753976AbbJTK2V (ORCPT ); Tue, 20 Oct 2015 06:28:21 -0400 Received: from galahad.ideasonboard.com ([185.26.127.97]:38378 "EHLO galahad.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751380AbbJTK2S (ORCPT ); Tue, 20 Oct 2015 06:28:18 -0400 From: Laurent Pinchart To: Magnus Damm , Geert Uytterhoeven Cc: iommu@lists.linux-foundation.org, SH-Linux , joro , linux-kernel , Simon Horman Subject: Re: [PATCH] iommu/ipmmu-vmsa: Drop LPAE Kconfig dependency Date: Tue, 20 Oct 2015 13:28:17 +0300 Message-ID: <1853633.usacnlzPRA@avalon> User-Agent: KMail/4.14.8 (Linux/4.0.5-gentoo; KDE/4.14.8; x86_64; ; ) In-Reply-To: References: <20151019030253.6274.46547.sendpatchset@little-apple> <1739171.POGWkgX12k@avalon> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Magnus, On Tuesday 20 October 2015 17:54:59 Magnus Damm wrote: > On Mon, Oct 19, 2015 at 3:42 PM, Laurent Pinchart wrote: > > On Monday 19 October 2015 12:02:53 Magnus Damm wrote: > >> From: Magnus Damm > >> > >> Neither the ARM page table code enabled by IOMMU_IO_PGTABLE_LPAE > >> nor the IPMMU_VMSA driver actually depends on ARM_LPAE, so get > >> rid of the dependency. > >> > >> Tested with ipmmu-vmsa on r8a7794 ALT and a kernel config using: > >> # CONFIG_ARM_LPAE is not set > > > > The driver only supports the 40-bits page table format for now, hence the > > dependency on LPAE, but it indeed seems that the dependency is bogus. As > > long as the 8 MSBs of the translated address are all 0 I assume the > > output 40-bit address is usable on a 32-bit physical address system. > > > > How have you tested the patch ? > > Modetest with local IPMMUMX enablement on r8a7794 ALT. Then, Acked-by: Laurent Pinchart -- Regards, Laurent Pinchart