drm/etnaviv: use a 32 bit mask as coherent DMA mask

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The STLB and the first command buffer (which is used to set up the TLBs)
has a 32 bit size restriction in hardware. There seems to be no way to
specify addresses larger than 32 bit. Keep it simple and restict the
addresses to the lower 4 GiB range for all coherent DMA memory
allocations.

Please note, that platform_device_alloc() will initialize dev->dma_mask
to point to pdev->platform_dma_mask, thus dma_set_mask() will work as
expected.

While at it, move the dma_mask setup code to the of_dma_configure() to
keep all the DMA setup code next to each other.

Suggested-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

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Michael Walle 2021-09-07 18:49:45 +02:00 • committed by Lucas Stach

parent 0ea057a9cb

commit f5be833dc8

1 changed files with 18 additions and 2 deletions

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drivers/gpu/drm/etnaviv/etnaviv_drv.c

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