Title: [6516] branches/2009R1/arch/blackfin/include/asm/dma.h: Make sure the descriptor buffers in the core are drained
- Revision
- 6516
- Author
- sonicz
- Date
- 2009-05-31 03:18:03 -0500 (Sun, 31 May 2009)
Log Message
Make sure the descriptor buffers in the core are drained
Modified Paths
Diff
Modified: branches/2009R1/arch/blackfin/include/asm/dma.h (6515 => 6516)
--- branches/2009R1/arch/blackfin/include/asm/dma.h 2009-05-31 08:07:25 UTC (rev 6515)
+++ branches/2009R1/arch/blackfin/include/asm/dma.h 2009-05-31 08:18:03 UTC (rev 6516)
@@ -206,10 +206,17 @@
static inline void set_dma_sg(unsigned int channel, struct dmasg *sg, int ndsize)
{
+ /* The descriptor buffers may be located in core internal SRAM.
+ * Make sure the descriptor buffers in the core are drained
+ * so that the DMA descriptors are completely written before
+ * the DMA engine goes to fetch them.
+ */
+ SSYNC();
+
+ dma_ch[channel].regs->next_desc_ptr = sg;
dma_ch[channel].regs->cfg =
(dma_ch[channel].regs->cfg & ~(0xf << 8)) |
((ndsize & 0xf) << 8);
- dma_ch[channel].regs->next_desc_ptr = sg;
}
static inline int dma_channel_active(unsigned int channel)
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