From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
To: Laxman Dewangan <ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Cc: vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 2/2] dma: tegra: fix residual calculation for cyclic case
Date: Mon, 02 Jul 2012 10:02:51 -0600 [thread overview]
Message-ID: <4FF1C62B.5070005@wwwdotorg.org> (raw)
In-Reply-To: <1341217328-6676-1-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
On 07/02/2012 02:22 AM, Laxman Dewangan wrote:
> In cyclic mode of DMA, the byte transferred can be more
> than the requested size and in this case, calculating
> residuals based on the current position of DMA transfer to
> bytes requested i.e. bytes required to transfer to reach
> bytes requested from current DMA position.
>
> Signed-off-by: Laxman Dewangan <ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
This makes sense to me, although I wonder if details like this aren't
something that the dmaengine core should be handling.
Acked-by: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
WARNING: multiple messages have this Message-ID (diff)
From: Stephen Warren <swarren@wwwdotorg.org>
To: Laxman Dewangan <ldewangan@nvidia.com>
Cc: vinod.koul@intel.com, dan.j.williams@intel.com,
swarren@nvidia.com, linux-kernel@vger.kernel.org,
linux-tegra@vger.kernel.org
Subject: Re: [PATCH 2/2] dma: tegra: fix residual calculation for cyclic case
Date: Mon, 02 Jul 2012 10:02:51 -0600 [thread overview]
Message-ID: <4FF1C62B.5070005@wwwdotorg.org> (raw)
In-Reply-To: <1341217328-6676-1-git-send-email-ldewangan@nvidia.com>
On 07/02/2012 02:22 AM, Laxman Dewangan wrote:
> In cyclic mode of DMA, the byte transferred can be more
> than the requested size and in this case, calculating
> residuals based on the current position of DMA transfer to
> bytes requested i.e. bytes required to transfer to reach
> bytes requested from current DMA position.
>
> Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
This makes sense to me, although I wonder if details like this aren't
something that the dmaengine core should be handling.
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
next prev parent reply other threads:[~2012-07-02 16:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-02 8:22 [PATCH 2/2] dma: tegra: fix residual calculation for cyclic case Laxman Dewangan
2012-07-02 8:22 ` Laxman Dewangan
2012-07-02 8:22 ` [PATCH 1/2] dma: tegra: rename driver and compatible to match with dts Laxman Dewangan
2012-07-02 8:22 ` Laxman Dewangan
[not found] ` <1341217328-6676-2-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-07-02 16:01 ` Stephen Warren
2012-07-02 16:01 ` Stephen Warren
2012-07-13 3:21 ` Vinod Koul
2012-07-13 3:21 ` Vinod Koul
[not found] ` <1341217328-6676-1-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-07-02 16:02 ` Stephen Warren [this message]
2012-07-02 16:02 ` [PATCH 2/2] dma: tegra: fix residual calculation for cyclic case Stephen Warren
[not found] ` <4FF1C62B.5070005-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-07-13 3:15 ` Vinod Koul
2012-07-13 3:15 ` Vinod Koul
2012-07-13 5:39 ` Laxman Dewangan
2012-07-13 5:39 ` Laxman Dewangan
[not found] ` <4FFFB476.9050006-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-07-13 6:28 ` Vinod Koul
2012-07-13 6:28 ` Vinod Koul
2012-07-13 6:39 ` Laxman Dewangan
2012-07-13 6:39 ` Laxman Dewangan
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