From: Vinod Koul <vinod.koul@intel.com>
To: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: linux-kernel@vger.kernel.org, linux-sh@vger.kernel.org,
Magnus Damm <magnus.damm@gmail.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
linux-mmc@vger.kernel.org, alsa-devel@alsa-project.org,
linux-serial@vger.kernel.org, Paul Mundt <lethal@linux-sh.org>
Subject: Re: [PATCH 1/7 v2] dmaengine: add a simple dma library
Date: Mon, 30 Jan 2012 14:02:26 +0530 [thread overview]
Message-ID: <1327912346.1527.13.camel@vkoul-udesk3> (raw)
In-Reply-To: <1327589784-4287-2-git-send-email-g.liakhovetski@gmx.de>
On Thu, 2012-01-26 at 15:56 +0100, Guennadi Liakhovetski wrote:
> This patch adds a library of functions, helping to implement dmaengine
> drivers for hardware, unable to handle scatter-gather lists natively.
> The first version of this driver only supports memcpy and slave DMA
> operation.
>
> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
> ---
>
> v2:
>
> 1. switch from using a tasklet to threaded IRQ, which allowed to
> 2. remove lock / unlock inline functions
> 3. remove __devinit, __devexit annotations
Sorry to join the discussion late, was on vacation, travel, long
weekend...
I don't still comprehend the need for a library on top of dmaengine
which gain is just a library between clients and dmacs. Surely we don't
want to write another abstraction on top of one provided?
If the question is to handle scatter-gather even if the hardware doesn't
have the capability, then why don't add that in dmaengine itself rather
than one more layer?
--
~Vinod
next prev parent reply other threads:[~2012-01-30 8:31 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-26 14:56 [PATCH 0/7 v2] extract a simple dmaengine library from shdma.c Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 1/7 v2] dmaengine: add a simple dma library Guennadi Liakhovetski
2012-01-26 17:34 ` [alsa-devel] " Sascha Hauer
2012-01-26 21:07 ` Guennadi Liakhovetski
2012-01-27 8:37 ` Shimoda, Yoshihiro
2012-01-27 8:48 ` Guennadi Liakhovetski
2012-01-31 11:03 ` Shimoda, Yoshihiro
2012-02-01 0:52 ` Guennadi Liakhovetski
2012-02-01 2:47 ` Shimoda, Yoshihiro
2012-02-02 22:19 ` Guennadi Liakhovetski
2012-02-03 8:47 ` Shimoda, Yoshihiro
2012-02-03 10:21 ` Guennadi Liakhovetski
2012-02-03 15:43 ` [PATCH/RFC] usb: fix renesas_usbhs to not schedule in atomic context Guennadi Liakhovetski
2012-02-05 14:54 ` Felipe Balbi
2012-02-06 10:11 ` Guennadi Liakhovetski
2012-02-06 10:31 ` Felipe Balbi
2012-02-06 8:52 ` Shimoda, Yoshihiro
2012-01-30 8:32 ` Vinod Koul [this message]
2012-01-30 9:34 ` [PATCH 1/7 v2] dmaengine: add a simple dma library Guennadi Liakhovetski
2012-01-31 6:41 ` Vinod Koul
2012-01-31 8:59 ` Guennadi Liakhovetski
2012-02-01 5:38 ` Vinod Koul
2012-02-03 16:38 ` Guennadi Liakhovetski
2012-02-06 2:54 ` Vinod Koul
2012-02-06 9:53 ` Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 2/7 v2] dma: shdma: prepare for simple DMA conversion Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 3/7 v2] mmc: sh_mmcif: remove unneeded struct sh_mmcif_dma, prepare for simple DMA Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 4/7 v2] mmc: sh_mobile_sdhi: prepare for conversion to " Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 5/7 v2] serial: sh-sci: " Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 6/7 v2] ASoC: SIU: " Guennadi Liakhovetski
2012-02-06 2:33 ` Vinod Koul
2012-02-06 9:11 ` Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 7/7 v2] dma: shdma: convert to the simple DMA library Guennadi Liakhovetski
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