linux-kernel - Re: [PATCH resend] dma: pl330: Fix cyclic transfers

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Message-ID: <20130722092236.GB18642@intel.com>
Date:	Mon, 22 Jul 2013 14:52:36 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Dan Williams <djbw@...com>,
	Jassi Brar <jaswinder.singh@...aro.org>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH resend] dma: pl330: Fix cyclic transfers

On Tue, Jul 16, 2013 at 04:13:23PM +0200, Lars-Peter Clausen wrote:
> Allocate a descriptor for each period of a cyclic transfer, not just the first.
> Also since the callback needs to be called for each finished period make sure to
> initialize the callback and callback_param fields of each descriptor in a cyclic
> transfer.

 
>  	switch (direction) {
>  	case DMA_MEM_TO_DEV:
> -		desc->rqcfg.src_inc = 1;
> -		desc->rqcfg.dst_inc = 0;
> -		desc->req.rqtype = MEMTODEV;
> -		src = dma_addr;
> -		dst = pch->fifo_addr;
> -		break;
>  	case DMA_DEV_TO_MEM:
> -		desc->rqcfg.src_inc = 0;
> -		desc->rqcfg.dst_inc = 1;
> -		desc->req.rqtype = DEVTOMEM;
> -		src = pch->fifo_addr;
> -		dst = dma_addr;
>  		break;
>  	default:
>  		dev_err(pch->dmac->pif.dev, "%s:%d Invalid dma direction\n",
shouldnt the whole switch be removed and for error check you should use
is_slave_direction()

~Vinod
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