diff options
| author | Laxman Dewangan <ldewangan@nvidia.com> | 2013-01-09 10:56:22 +0100 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2013-01-09 15:13:32 +0100 |
| commit | b9bb37f5486ba05d2b557dbf1aeb754fef618985 (patch) | |
| tree | 25abbffc56fbe2ebe2fc843f97d53f06aa08e54d | |
| parent | dmaengine: imx-dma: Disable use of hw_chain to fix sg_dma transfers. (diff) | |
| download | linux-b9bb37f5486ba05d2b557dbf1aeb754fef618985.tar.xz linux-b9bb37f5486ba05d2b557dbf1aeb754fef618985.zip | |
dma: tegra: implement flags parameters for cyclic transfer
The flag parameter is added in the cyclic transfer request.
Use the flag option of:
- DMA_PREP_INTERRUPT for enabling interrupt.
- DMA_CTRL_ACK for deciding whether ack is requred or not for
descriptor.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
| -rw-r--r-- | drivers/dma/tegra20-apb-dma.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index efdfffa13349..bf58bb8b0206 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -266,6 +266,7 @@ static struct tegra_dma_desc *tegra_dma_desc_get( if (async_tx_test_ack(&dma_desc->txd)) { list_del(&dma_desc->node); spin_unlock_irqrestore(&tdc->lock, flags); + dma_desc->txd.flags = 0; return dma_desc; } } @@ -1050,7 +1051,9 @@ struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic( TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT; ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32; - csr |= TEGRA_APBDMA_CSR_FLOW | TEGRA_APBDMA_CSR_IE_EOC; + csr |= TEGRA_APBDMA_CSR_FLOW; + if (flags & DMA_PREP_INTERRUPT) + csr |= TEGRA_APBDMA_CSR_IE_EOC; csr |= tdc->dma_sconfig.slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT; apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1; @@ -1095,7 +1098,8 @@ struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic( mem += len; } sg_req->last_sg = true; - dma_desc->txd.flags = 0; + if (flags & DMA_CTRL_ACK) + dma_desc->txd.flags = DMA_CTRL_ACK; /* * Make sure that mode should not be conflicting with currently |