From: Christoph Hellwig hch@lst.de
[ Upstream commit 9739ab7eda459f0669ec9807e0d9be5020bab88c ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/include/asm/page.h | 7 +++++++ arch/powerpc/mm/mem.c | 3 ++- arch/powerpc/platforms/powermac/Kconfig | 1 + 3 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index ed870468ef6f..d408711d09fb 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -330,6 +330,13 @@ 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 */ diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index f6787f90e158..b98ce400a889 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -255,7 +255,8 @@ void __init paging_init(void) (long int)((top_of_ram - total_ram) >> 20));
#ifdef CONFIG_ZONE_DMA - max_zone_pfns[ZONE_DMA] = min(max_low_pfn, 0x7fffffffUL >> PAGE_SHIFT); + max_zone_pfns[ZONE_DMA] = min(max_low_pfn, + ((1UL << ARCH_ZONE_DMA_BITS) - 1) >> PAGE_SHIFT); #endif max_zone_pfns[ZONE_NORMAL] = max_low_pfn; #ifdef CONFIG_HIGHMEM diff --git a/arch/powerpc/platforms/powermac/Kconfig b/arch/powerpc/platforms/powermac/Kconfig index f834a19ed772..c02d8c503b29 100644 --- a/arch/powerpc/platforms/powermac/Kconfig +++ b/arch/powerpc/platforms/powermac/Kconfig @@ -7,6 +7,7 @@ config PPC_PMAC select PPC_INDIRECT_PCI if PPC32 select PPC_MPC106 if PPC32 select PPC_NATIVE + select ZONE_DMA if PPC32 default y
config PPC_PMAC64