[PATCH] drivers: of: of_reserved_mem: fixup the CMA alignment not to affect dma-coherent

From: Jaewon Kim
Date: Mon May 16 2016 - 06:06:47 EST


There was an alignment mismatch issue for CMA and it was fixed by
commit 1cc8e3458b51 ("drivers: of: of_reserved_mem: fixup the alignment with CMA setup").
However the way of the commit considers not only dma-contiguous(CMA) but also
dma-coherent which has no that requirement.

This patch checks more to distinguish dma-contiguous(CMA) from dma-coherent.

Signed-off-by: Jaewon <jaewon31.kim@xxxxxxxxxxx>
---
drivers/of/of_reserved_mem.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index ed01c01..45b873e 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -127,7 +127,10 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
}

/* Need adjust the alignment to satisfy the CMA requirement */
- if (IS_ENABLED(CONFIG_CMA) && of_flat_dt_is_compatible(node, "shared-dma-pool"))
+ if (IS_ENABLED(CONFIG_CMA)
+ && of_flat_dt_is_compatible(node, "shared-dma-pool")
+ && of_get_flat_dt_prop(node, "reusable", NULL)
+ && !of_get_flat_dt_prop(node, "no-map", NULL)) {
align = max(align, (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));

prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);