[PATCH] cma: increase CMA_ALIGNMENT upper limit to 12

[PATCH] cma: increase CMA_ALIGNMENT upper limit to 12

[Marc Carino]

Certain platforms contain peripherals which have contiguous
memory alignment requirements, necessitating the use of the alignment
argument when obtaining CMA memory. The current default maximum
CMA_ALIGNMENT of order 9 translates into a 1MB alignment on systems
with a 4K page size. To accommodate systems with peripherals with even
larger alignment requirements, increase the upper-bound of
CMA_ALIGNMENT from order 9 to order 12.

Marc Carino (1):
  cma: increase CMA_ALIGNMENT upper limit to 12

 drivers/base/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
1.9.1

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[PATCH] cma: increase CMA_ALIGNMENT upper limit to 12

[Marc Carino]

Some systems require a larger maximum PAGE_SIZE order for CMA
allocations. To accommodate such systems, increase the upper-bound of
the CMA_ALIGNMENT range to 12 (which ends up being 16MB on systems
with 4K pages).

Signed-off-by: Marc Carino <marc.ceeeee@gmail.com>
---
 drivers/base/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index 8fa8dea..0fb820c 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -253,7 +253,7 @@ endchoice
 
 config CMA_ALIGNMENT
 	int "Maximum PAGE_SIZE order of alignment for contiguous buffers"
-	range 4 9
+	range 4 12
 	default 8
 	help
 	  DMA mapping framework by default aligns all buffers to the smallest
-- 
1.9.1

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