drm/exynos: g2d: wait for engine to finish

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While the engine works on a runqueue node it does memory access to
the buffers associated with that node.
Make sure that the engine is idle when g2d_close() and/or
g2d_remove() are called, i.e. buffer associated with the process (for
g2d_close()), or all buffers (for g2d_remove()) can be safely be
unmapped.

We have to take into account that the engine might be in an undefined
state, i.e. it hangs and doesn't become idle. In this case, we issue
a hardware reset to return the hardware and the driver context into a
proper state.

Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

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Tobias Jakobi 2016-09-27 17:50:09 +02:00 • committed by Inki Dae

parent 5332737432

commit 134a0fe984

1 changed files with 77 additions and 7 deletions

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drivers/gpu/drm/exynos/exynos_drm_g2d.c

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