linux-kernel - Re: [PATCH] iommu/tegra-smmu: Fix mc errors on tegra124-nyan

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Message-ID: <ee0f40f4-dffe-2987-5d4b-c5896f27ec24@gmail.com>
Date:   Sat, 27 Feb 2021 12:59:17 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     joro@...tes.org, thierry.reding@...il.com, will@...nel.org,
        guillaume.tucker@...labora.com, vdumpa@...dia.com,
        jonathanh@...dia.com, linux-tegra@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/tegra-smmu: Fix mc errors on tegra124-nyan

25.02.2021 09:27, Nicolin Chen пишет:
...
>> The partially revert should be okay, but it's not clear to me what makes
>> difference for T124 since I don't see that problem on T30, which also
>> has active display at a boot time.
> 
> Hmm..do you see ->attach_dev() is called from host1x_client_iommu_attach
> or from of_dma_configure_id/arch_setup_dma_ops?
> 

I applied yours debug-patch, please see dmesg.txt attached to the email.
Seems probe-defer of the tegra-dc driver prevents the implicit
tegra_smmu_attach_dev, so it happens to work by accident.

View attachment "dmesg.txt" of type "text/plain" (76125 bytes)