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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-10 16:36:38 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-10 16:36:38 +1000
commitb2f2e8fee3d62f621e795f25b2fc0f51bbdb4af9 (patch)
treeb32c0e3c4143781e81fffcdc02cdd38a1a5279d9
parentf4b9a988685da6386d7f9a72df3098bcc3270526 (diff)
downloadlinux-linaro-android-b2f2e8fee3d62f621e795f25b2fc0f51bbdb4af9.tar.gz
powerpc/dma: pci_set_dma_mask() shouldn't fail if mask fits in RAM
On an iMac G5, the b43 driver is failing to initialise because trying to set the dma mask to 30-bit fails. Even though there's only 512MiB of RAM in the machine anyway: https://bugzilla.redhat.com/show_bug.cgi?id=514787 We should probably let it succeed if the available RAM in the system doesn't exceed the requested limit. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/kernel/dma.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 20a60d661ba..ccf129d47d8 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -7,6 +7,7 @@
#include <linux/device.h>
#include <linux/dma-mapping.h>
+#include <linux/lmb.h>
#include <asm/bug.h>
#include <asm/abs_addr.h>
@@ -90,11 +91,10 @@ static void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sg,
static int dma_direct_dma_supported(struct device *dev, u64 mask)
{
#ifdef CONFIG_PPC64
- /* Could be improved to check for memory though it better be
- * done via some global so platforms can set the limit in case
+ /* Could be improved so platforms can set the limit in case
* they have limited DMA windows
*/
- return mask >= DMA_BIT_MASK(32);
+ return mask >= (lmb_end_of_DRAM() - 1);
#else
return 1;
#endif