[PATCH v2 10/14] arm: dma-mapping: Invoke dma offset func if needed

[Jim Quinlan]

Just like dma_pfn_offset, another offset is added to the dma/phys
translation if there happen to be multiple regions that have different
mapping offsets.

Signed-off-by: Jim Quinlan <james.quin...@broadcom.com>
---
 arch/arm/include/asm/dma-mapping.h | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/arm/include/asm/dma-mapping.h 
b/arch/arm/include/asm/dma-mapping.h
index bdd80ddbca34..811389b4fb29 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -35,8 +35,12 @@ static inline const struct dma_map_ops 
*get_arch_dma_ops(struct bus_type *bus)
 #ifndef __arch_pfn_to_dma
 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
 {
-       if (dev)
+       if (dev) {
+               /* This should compile out if !CONFIG_DMA_PFN_OFFSET_MAP */
+               pfn -= dma_pfn_offset_from_phys_addr(dev, PFN_PHYS(pfn));
+
                pfn -= dev->dma_pfn_offset;
+       }
        return (dma_addr_t)__pfn_to_bus(pfn);
 }
 
@@ -44,9 +48,12 @@ static inline unsigned long dma_to_pfn(struct device *dev, 
dma_addr_t addr)
 {
        unsigned long pfn = __bus_to_pfn(addr);
 
-       if (dev)
-               pfn += dev->dma_pfn_offset;
+       if (dev) {
+               /* This should compile out if !CONFIG_DMA_PFN_OFFSET_MAP */
+               pfn += dma_pfn_offset_from_dma_addr(dev, addr);
 
+               pfn += dev->dma_pfn_offset;
+       }
        return pfn;
 }
 
-- 
2.17.1