diff options
| author | Christoph Hellwig <hch@lst.de> | 2019-06-13 10:24:46 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-06-19 22:31:20 +1000 |
| commit | 9739ab7eda459f0669ec9807e0d9be5020bab88c (patch) | |
| tree | 8c47ef74097699cd4dd4d53bebf10a8ccbb7610d /arch/powerpc/include/asm/page.h | |
| parent | 84b028243ef07a3f65c1857343ada2b1022f8bed (diff) | |
| download | lwn-9739ab7eda459f0669ec9807e0d9be5020bab88c.tar.gz lwn-9739ab7eda459f0669ec9807e0d9be5020bab88c.zip | |
powerpc: enable a 30-bit ZONE_DMA for 32-bit pmac
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: 65a21b71f948 ("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>
Diffstat (limited to 'arch/powerpc/include/asm/page.h')
| -rw-r--r-- | arch/powerpc/include/asm/page.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index dbc8c0679480..3d013e4696e9 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -323,6 +323,13 @@ struct vm_area_struct; #endif /* __ASSEMBLY__ */ #include <asm/slice.h> +/* + * Allow 30-bit DMA for very limited Broadcom wifi chips on many powerbooks. + */ +#ifdef CONFIG_PPC32 +#define ARCH_ZONE_DMA_BITS 30 +#else #define ARCH_ZONE_DMA_BITS 31 +#endif #endif /* _ASM_POWERPC_PAGE_H */ |