From: Dmitry Osipenko <digetx@gmail.com>
To: Nicolin Chen <nicoleotsuka@gmail.com>,
joro@8bytes.org, thierry.reding@gmail.com, will@kernel.org,
guillaume.tucker@collabora.com
Cc: vdumpa@nvidia.com, jonathanh@nvidia.com,
linux-tegra@vger.kernel.org, iommu@lists.linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] iommu/tegra-smmu: Fix mc errors on tegra124-nyan
Date: Sat, 20 Feb 2021 08:16:22 +0300 [thread overview]
Message-ID: <9d6445c0-9574-1650-e327-32b11716f87e@gmail.com> (raw)
In-Reply-To: <20210218220702.1962-1-nicoleotsuka@gmail.com>
19.02.2021 01:07, Nicolin Chen пишет:
> Commit 25938c73cd79 ("iommu/tegra-smmu: Rework tegra_smmu_probe_device()")
> removed certain hack in the tegra_smmu_probe() by relying on IOMMU core to
> of_xlate SMMU's SID per device, so as to get rid of tegra_smmu_find() and
> tegra_smmu_configure() that are typically done in the IOMMU core also.
>
> This approach works for both existing devices that have DT nodes and other
> devices (like PCI device) that don't exist in DT, on Tegra210 and Tegra3
> upon testing. However, Page Fault errors are reported on tegra124-Nyan:
>
> tegra-mc 70019000.memory-controller: display0a: read @0xfe056b40:
> EMEM address decode error (SMMU translation error [--S])
> tegra-mc 70019000.memory-controller: display0a: read @0xfe056b40:
> Page fault (SMMU translation error [--S])
>
> After debugging, I found that the mentioned commit changed some function
> callback sequence of tegra-smmu's, resulting in enabling SMMU for display
> client before display driver gets initialized. I couldn't reproduce exact
> same issue on Tegra210 as Tegra124 (arm-32) differs at arch-level code.
Hello Nicolin,
Could you please explain in a more details what exactly makes the
difference for the callback sequence?
next prev parent reply other threads:[~2021-02-20 5:17 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-18 22:07 [PATCH] iommu/tegra-smmu: Fix mc errors on tegra124-nyan Nicolin Chen
2021-02-20 5:16 ` Dmitry Osipenko [this message]
2021-02-23 2:13 ` Nicolin Chen
2021-02-23 5:10 ` Dmitry Osipenko
2021-02-25 6:27 ` Nicolin Chen
2021-02-27 9:59 ` Dmitry Osipenko
2021-03-02 23:08 ` Nicolin Chen
2021-03-03 9:47 ` Dmitry Osipenko
2021-03-28 15:25 ` Dmitry Osipenko
2021-03-28 15:36 ` Dmitry Osipenko
2021-02-22 13:15 ` Guillaume Tucker
2021-03-03 18:26 ` Thierry Reding
2021-03-04 12:21 ` Joerg Roedel
2021-03-10 19:13 ` Dmitry Osipenko
2021-03-10 20:22 ` Dmitry Osipenko
2021-03-10 22:17 ` Nicolin Chen
2021-03-11 12:06 ` Dmitry Osipenko
2021-03-12 1:09 ` Nicolin Chen
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