linux-kernel - Re: [PATCH RESEND] dma: tegra: implement flags parameters for cyclic transfer

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Date:	Wed, 9 Jan 2013 05:30:53 -0800
From:	Vinod Koul <vinod.koul@...el.com>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	djbw@...com, linux-kernel@...r.kernel.org, swarren@...dia.com,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH RESEND] dma: tegra: implement flags parameters for
 cyclic transfer

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 <ldewangan@...dia.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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