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ARM: tegra: dma: not required to move requestor when stopping. 

It is not require to move the requestor of dma to INVALID
option before stopping dma.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Laxman Dewangan 2012-01-24 13:40:49 +05:30 committed by Olof Johansson
parent 76c2f6e513
commit 8bc4f556bd
1 changed files with 0 additions and 8 deletions
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8
arch/arm/mach-tegra/dma.c
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@ -52,8 +52,6 @@
#define CSR_ONCE (1<<27)
#define CSR_FLOW (1<<21)
#define CSR_REQ_SEL_SHIFT 16
#define CSR_REQ_SEL_MASK (0x1F<<CSR_REQ_SEL_SHIFT)
#define CSR_REQ_SEL_INVALID (31<<CSR_REQ_SEL_SHIFT)
#define CSR_WCOUNT_SHIFT 2
#define CSR_WCOUNT_MASK 0xFFFC
@ -183,18 +181,12 @@ static void tegra_dma_stop(struct tegra_dma_channel *ch)
static int tegra_dma_cancel(struct tegra_dma_channel *ch)
{
u32 csr;
unsigned long irq_flags;
spin_lock_irqsave(&ch->lock, irq_flags);
while (!list_empty(&ch->list))
list_del(ch->list.next);
csr = readl(ch->addr + APB_DMA_CHAN_CSR);
csr &= ~CSR_REQ_SEL_MASK;
csr |= CSR_REQ_SEL_INVALID;
writel(csr, ch->addr + APB_DMA_CHAN_CSR);
tegra_dma_stop(ch);
spin_unlock_irqrestore(&ch->lock, irq_flags);