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From: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Jon Hunter <jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
	Nicolin Chen
	<nicoleotsuka-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	gnurou-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org,
	ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org
Subject: Re: [PATCH v2 0/2] Add memcpy support for tegra210-adma
Date: Tue, 6 Sep 2016 15:03:43 +0300	[thread overview]
Message-ID: <5db4d7db-b1f4-c6af-de56-e8bb13ebc465@gmail.com> (raw)
In-Reply-To: <319ca097-4b10-83b9-841c-52adccbb48ad-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

On 06.09.2016 14:33, Jon Hunter wrote:
> 
> On 03/09/16 01:32, Nicolin Chen wrote:
>> This series of patches add memcpy support for tegra210 ADMA engine.
> 
> Thanks. Any reason you choose this DMA and not the APB DMA? The APB DMA
> is more of a generic DMA and so for memcpy it would seem to be a good
> choice and it is available on all Tegras not just Tegra210.
> 

Just a small clarification:

If I'm not mistaken, APB DMA is mem-to-device, while AHB DMA is mem-to-mem. So,
you probably meant AHB and not the APB.

> Furthermore, from a power standpoint the ADMA is in the audio power
> domain and so using it for memcpy would mean the audio power domain is
> turned on. It may not be a big deal for some, but given the APB is in
> the CORE domain (always on when not in low-power) it seems like a better
> choice for power as well.
> 

-- 
Dmitry

WARNING: multiple messages have this Message-ID (diff)
From: Dmitry Osipenko <digetx@gmail.com>
To: Jon Hunter <jonathanh@nvidia.com>,
	Nicolin Chen <nicoleotsuka@gmail.com>,
	vinod.koul@intel.com
Cc: linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org,
	dmaengine@vger.kernel.org, gnurou@gmail.com,
	thierry.reding@gmail.com, swarren@wwwdotorg.org,
	ldewangan@nvidia.com
Subject: Re: [PATCH v2 0/2] Add memcpy support for tegra210-adma
Date: Tue, 6 Sep 2016 15:03:43 +0300	[thread overview]
Message-ID: <5db4d7db-b1f4-c6af-de56-e8bb13ebc465@gmail.com> (raw)
In-Reply-To: <319ca097-4b10-83b9-841c-52adccbb48ad@nvidia.com>

On 06.09.2016 14:33, Jon Hunter wrote:
> 
> On 03/09/16 01:32, Nicolin Chen wrote:
>> This series of patches add memcpy support for tegra210 ADMA engine.
> 
> Thanks. Any reason you choose this DMA and not the APB DMA? The APB DMA
> is more of a generic DMA and so for memcpy it would seem to be a good
> choice and it is available on all Tegras not just Tegra210.
> 

Just a small clarification:

If I'm not mistaken, APB DMA is mem-to-device, while AHB DMA is mem-to-mem. So,
you probably meant AHB and not the APB.

> Furthermore, from a power standpoint the ADMA is in the audio power
> domain and so using it for memcpy would mean the audio power domain is
> turned on. It may not be a big deal for some, but given the APB is in
> the CORE domain (always on when not in low-power) it seems like a better
> choice for power as well.
> 

-- 
Dmitry

  parent reply	other threads:[~2016-09-06 12:03 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-03  0:32 [PATCH v2 0/2] Add memcpy support for tegra210-adma Nicolin Chen
2016-09-03  0:32 ` [PATCH v2 1/2] dmaengine: tegra210-adma: Add pre-check for cyclic callback Nicolin Chen
     [not found] ` <cover.1472857934.git.nicoleotsuka-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-09-03  0:32   ` [PATCH v2 2/2] dmaengine: tegra210-adma: Add memcpy support Nicolin Chen
2016-09-03  0:32     ` Nicolin Chen
     [not found]     ` <738e0f1560436d613d9a7dab2fd540abea9503d3.1472857934.git.nicoleotsuka-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-09-06 11:52       ` Jon Hunter
2016-09-06 11:52         ` Jon Hunter
     [not found]         ` <f9850c0c-a4a9-4d5f-eaa9-c1fd39b72870-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-09-06 17:21           ` Nicolin Chen
2016-09-06 17:21             ` Nicolin Chen
2016-09-06 11:33   ` [PATCH v2 0/2] Add memcpy support for tegra210-adma Jon Hunter
2016-09-06 11:33     ` Jon Hunter
     [not found]     ` <319ca097-4b10-83b9-841c-52adccbb48ad-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-09-06 12:03       ` Dmitry Osipenko [this message]
2016-09-06 12:03         ` Dmitry Osipenko
2016-09-06 13:04         ` Jon Hunter
2016-09-06 13:04           ` Jon Hunter
     [not found]           ` <6f45ff6e-5fa7-7aca-154c-85cf235aa62f-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-09-06 13:46             ` Jon Hunter
2016-09-06 13:46               ` Jon Hunter
2016-09-06 14:27               ` Dmitry Osipenko

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