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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/