linux-kernel - Re: [PATCH] dma: mmp-tdma: refine dma disable and dma-pos update

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Message-ID: <CABQgh9FnVWVow1qeM0Cvf8BODgMMP4A9ty4LK8KGzmWPu3iwFA@mail.gmail.com>
Date:	Fri, 6 Feb 2015 13:19:17 +0800
From:	Zhangfei Gao <zhangfei.gao@...aro.org>
To:	Qiao Zhou <zhouqiao@...vell.com>
Cc:	"Williams, Dan J" <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dma: mmp-tdma: refine dma disable and dma-pos update

On 5 February 2015 at 20:54, Qiao Zhou <zhouqiao@...vell.com> wrote:
> Below are the refinements.
> 1. Set DMA abort bit when disabling dma channel. This will clear
> the remaining data in dma FIFO, to fix channel-swap issue.
> 2. Read DMA HW pointer when updating DMA status. Previously dma
> position is calculated by adding one period size in dma interrupt.
> This is inaccurate/insufficient for some high-quality audio APP.
> Since interrupt bottom half handler has variable schedule delay,
> it causes big error when calculating sample delay. Read the actual
> HW pointer and feedback can improve the accuracy.
> 3. Do some minor code clean.
>
> Signed-off-by: Qiao Zhou <zhouqiao@...vell.com>

Acked-by: Zhangfei Gao <zhangfei.gao@...aro.org>

Thanks
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