ENGR00181680-1 No audio when play 3 streams after 3~10 seconds sometimes

sdma: bd is bufferable dma buffer, interrupt handler can not get correct
      data after sdma script updated. Which will cause there is no interrupt
      after failed period number times in the interrupt handler.
This is a workaround.

Signed-off-by: b02247 <b02247@freescale.com>

2 files changed, 30 insertions, 0 deletions

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 635c940cd060..5eaa7a2f4240 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -173,6 +173,19 @@ static inline void dma_free_noncoherent(struct device *dev, size_t size,
 }
 
 /**
+ * dma_alloc_noncached - allocate consistent memory for DMA
+ * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
+ * @size: required memory size
+ * @handle: bus-specific DMA address
+ *
+ * Allocate some uncached, unbuffered memory for a device for
+ * performing DMA.  This function allocates pages, and will
+ * return the CPU-viewed address, and sets @handle to be the
+ * device-viewed address.
+ */
+extern void *dma_alloc_noncached(struct device *, size_t, dma_addr_t *, gfp_t);
+
+/**
  * dma_alloc_coherent - allocate consistent memory for DMA
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
  * @size: required memory size
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 0f0baddf4eb9..feb83cb5e993 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -333,6 +333,23 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
  * virtual and bus address for that space.
  */
 void *
+dma_alloc_noncached(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
+{
+	void *memory;
+
+	if (dma_alloc_from_coherent(dev, size, handle, &memory))
+		return memory;
+
+	return __dma_alloc(dev, size, handle, gfp,
+			   pgprot_noncached(pgprot_kernel));
+}
+EXPORT_SYMBOL(dma_alloc_noncached);
+
+/*
+ * Allocate DMA-coherent memory space and return both the kernel remapped
+ * virtual and bus address for that space.
+ */
+void *
 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
 {
 	void *memory;