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Date:   Wed, 3 Apr 2019 13:47:51 +0300
From:   Dmitry Osipenko <>
To:     Thierry Reding <>,
        Jonathan Hunter <>
Subject: Re: [PATCH v1] drm/tegra: gem: Fix CPU-cache maintenance for BO's
 allocated using get_pages()

07.03.2019 1:55, Dmitry Osipenko пишет:
> The allocated pages need to be invalidated in CPU caches. On ARM32 the
> DMA_BIDIRECTIONAL flag only ensures that data is written-back to DRAM and
> the data stays in CPU cache lines. While the DMA_FROM_DEVICE flag ensures
> that the corresponding CPU cache lines are getting invalidated and nothing
> more, that's exactly what is needed for a newly allocated pages.
> This fixes randomly failing rendercheck tests on Tegra30 using the
> Opentegra driver for tests that use small-sized pixmaps (10x10 and less,
> i.e. 1-2 memory pages) because apparently CPU reads out stale data from
> caches and/or that data is getting evicted to DRAM at the time of HW job
> execution.
> Cc: stable <>
> Signed-off-by: Dmitry Osipenko <>

Thierry, please don't forget about this patch.

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