From: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
SDMA channel is not disabled after transaction error. So explicitly disable it.
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Acked By : Nishant kamat <nskamat@xxxxxx>
---
Index: linux-omap-2.6/arch/arm/plat-omap/dma.c
===================================================================
--- linux-omap-2.6.orig/arch/arm/plat-omap/dma.c 2008-09-23 16:41:23.000000000 +0530
+++ linux-omap-2.6/arch/arm/plat-omap/dma.c 2008-09-25 14:54:00.162059260 +0530
@@ -1849,9 +1849,22 @@ static int omap2_dma_handle_ch(int ch)
printk(KERN_INFO
"DMA synchronization event drop occurred with device "
"%d\n", dma_chan[ch].dev_id);
- if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ))
+ if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
printk(KERN_INFO "DMA transaction error with device %d\n",
dma_chan[ch].dev_id);
+ if (cpu_class_is_omap2()) {
+ /* Errata: sDMA Channel is not disabled
+ * after a transaction error. So we explicitely
+ * disable the channel
+ */
+ u32 ccr;
+
+ ccr = dma_read(CCR(ch));
+ ccr &= ~OMAP_DMA_CCR_EN;
+ dma_write(ccr, CCR(ch));
+ dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
+ }
+ }
if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
printk(KERN_INFO "DMA secure error with device %d\n",
dma_chan[ch].dev_id);--
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