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dmaengine: sirf: clear pending DMA interrupt when DMA terminates 

If DMA interrupt comes and is latched by IRQ controller during the
execution of dma_terminate_all(), dma_irq routine will be executed
after dma terminated, and it will cause kernel panic.
We clear DMA interrupts in dma_terminate_all() to avoid this useless
interrupt.

Signed-off-by: Yanchang Li <Yanchang.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Yanchang Li 2015-07-27 05:50:21 +00:00 committed by Vinod Koul
parent df48f3ff95
commit ac9bd0ef5d
1 changed files with 3 additions and 0 deletions
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3
drivers/dma/sirf-dma.c
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@ -455,6 +455,7 @@ static int sirfsoc_dma_terminate_all(struct dma_chan *chan)
switch (sdma->type) {
case SIRFSOC_DMA_VER_A7V1:
writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_INT_EN_CLR);
writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_CH_INT);
writel_relaxed((1 << cid) | 1 << (cid + 16),
sdma->base +
SIRFSOC_DMA_CH_LOOP_CTRL_CLR_ATLAS7);
@ -462,6 +463,8 @@ static int sirfsoc_dma_terminate_all(struct dma_chan *chan)
break;
case SIRFSOC_DMA_VER_A7V2:
writel_relaxed(0, sdma->base + SIRFSOC_DMA_INT_EN_ATLAS7);
writel_relaxed(SIRFSOC_DMA_INT_ALL_ATLAS7,
sdma->base + SIRFSOC_DMA_INT_ATLAS7);
writel_relaxed(0, sdma->base + SIRFSOC_DMA_LOOP_CTRL_ATLAS7);
writel_relaxed(0, sdma->base + SIRFSOC_DMA_VALID_ATLAS7);
break;