On Thu, Mar 07, 2019 at 01:55:19AM +0300, Dmitry Osipenko wrote: > 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 <stable@xxxxxxxxxxxxxxx> > Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx> > --- > drivers/gpu/drm/tegra/gem.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) Applied, thanks. Thierry
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