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authorSantosh Shilimkar2008-12-10 17:36:53 -0800
committerTony Lindgren2008-12-10 17:36:53 -0800
commita50f18c70049a73bd663ff889ef10d1097fd53f9 (patch)
treef0d420bdeea7517a9157a4b84c920d6917b60898 /arch
parentb1c056d20caa6fdd3481b348567f1f91e98aaa4b (diff)
ARM: OMAP3: DMA: Fix for sDMA Errata 1.113
SDMA channel is not disabled after transaction error. So explicitly disable it. Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked By : Nishant kamat <nskamat@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/plat-omap/dma.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index 50f8b4ad9a09..3df374055796 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -1848,9 +1848,22 @@ 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);