On Wed, Jan 09, 2013 at 03:26:22PM +0530, Laxman Dewangan wrote:
> 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 <ldewan...@nvidia.com>
Applied thanks
--
~Vinod
> ---
> Vinod,
> This patch was sent before holiday and may be it is missed in you radar.
> You have already applied my other patches on dma which was sent later so
> resending this patch.
> Stephen wanted this to be part of stable branch also.
> This is against bug fixes and new feature added in K3.7 for cyclic transfer
> without
> interrupt.
>
> 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 efdfffa..bf58bb8 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
> --
> 1.7.1.1
>
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