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[109.252.193.85]) by smtp.googlemail.com with ESMTPSA id x19sm878929lfr.198.2021.04.02.07.41.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 02 Apr 2021 07:41:27 -0700 (PDT) Subject: Re: [PATCH v1 2/2] iommu/tegra-smmu: Revert workaround that was needed for Nyan Big Chromebook To: Nicolin Chen , guillaume.tucker@collabora.com Cc: Thierry Reding , Joerg Roedel , Jonathan Hunter , Krishna Reddy , Will Deacon , iommu@lists.linux-foundation.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210328233256.20494-1-digetx@gmail.com> <20210328233256.20494-2-digetx@gmail.com> <20210401085549.GA31146@Asurada-Nvidia> From: Dmitry Osipenko Message-ID: <50a7e4c7-0e72-534a-a317-366e455213c1@gmail.com> Date: Fri, 2 Apr 2021 17:40:55 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210401085549.GA31146@Asurada-Nvidia> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org 01.04.2021 11:55, Nicolin Chen пишет: > On Mon, Mar 29, 2021 at 02:32:56AM +0300, Dmitry Osipenko wrote: >> The previous commit fixes problem where display client was attaching too >> early to IOMMU during kernel boot in a multi-platform kernel configuration >> which enables CONFIG_ARM_DMA_USE_IOMMU=y. The workaround that helped to >> defer the IOMMU attachment for Nyan Big Chromebook isn't needed anymore, >> revert it. > > Sorry for the late reply. I have been busy with downstream tasks. > > I will give them a try by the end of the week. Yet, probably it'd > be better to include Guillaume also as he has the Nyan platform. > Indeed, thanks. Although, I'm pretty sure that it's the same issue which I reproduced on Nexus 7. Guillaume, could you please give a test to these patches on Nyan Big? There should be no EMEM errors in the kernel log with this patches. https://patchwork.ozlabs.org/project/linux-tegra/list/?series=236215