powerpc: enable a 30-bit ZONE_DMA for 32-bit pmac

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With the strict dma mask checking introduced with the switch to
the generic DMA direct code common wifi chips on 32-bit powerbooks
stopped working.  Add a 30-bit ZONE_DMA to the 32-bit pmac builds
to allow them to reliably allocate dma coherent memory.

Fixes: 65a21b71f9 ("powerpc/dma: remove dma_nommu_dma_supported")
Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

...

This commit is contained in:

Christoph Hellwig 2019-06-13 10:24:46 +02:00 • committed by Michael Ellerman

parent 84b028243e

commit 9739ab7eda

3 changed files with 10 additions and 1 deletions

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7

arch/powerpc/include/asm/page.h

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3

arch/powerpc/mm/mem.c

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1

arch/powerpc/platforms/powermac/Kconfig

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