drm/tegra: Acquire a reference to the IOVA cache

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The IOVA API uses a memory cache to allocate IOVA nodes from. To make
sure that this cache is available, obtain a reference to it and release
the reference when the cache is no longer needed.

On 64-bit ARM this is hidden by the fact that the DMA mapping API gets
that reference and never releases it. On 32-bit ARM, however, the DMA
mapping API doesn't do that, so allocation of IOVA nodes fails.

Fixes: ad92601521 ("drm/tegra: Add Tegra DRM allocation API")
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

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Thierry Reding 2018-04-23 08:57:45 +02:00

parent 5f43ac8d80

commit 24cfdc1ac7

1 changed files with 9 additions and 1 deletions

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drivers/gpu/drm/tegra/drm.c

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