On 6/14/19 2:15 PM, Aaro Koskinen wrote:
Hi,
On Fri, Jun 14, 2019 at 09:24:16AM +0200, Mathieu Malaterre wrote:
On Thu, Jun 13, 2019 at 10:27 AM Christoph Hellwig <h...@lst.de> wrote:
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.koski...@iki.fi>
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
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 b8286a2013b4..0d52f57fca04 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -319,6 +319,13 @@ struct vm_area_struct;
#endif /* __ASSEMBLY__ */
#include <asm/slice.h>
+/*
+ * Allow 30-bit DMA for very limited Broadcom wifi chips on many powerbooks.
nit: would it be possible to mention explicit reference to b43-legacy.
Using b43 on my macmini g4 never showed those symptoms (using
5.2.0-rc2+)
According to Wikipedia Mac mini G4 is limited to 1 GB RAM, so that's
why you don't see the issue.
He wouldn't see it with b43. Those cards have 32-bit DMA.
Larry
