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From: viresh kumar <viresh.kumar-qxv4g6HH51o@public.gmane.org>
To: Linus Walleij <linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Armando VISCONTI <armando.visconti-qxv4g6HH51o@public.gmane.org>,
	"spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org"
	<spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
	"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	Shiraz HASHIM <shiraz.hashim-qxv4g6HH51o@public.gmane.org>
Subject: Re: [QUERY] amba/pl022: DMA channel allocation always fail.
Date: Mon, 16 May 2011 10:15:36 +0530	[thread overview]
Message-ID: <4DD0ABF0.3020707@st.com> (raw)
In-Reply-To: <BANLkTinMH9TpTTzqoMPS7JZUBRss3pScWg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On 05/13/2011 08:01 PM, Linus Walleij wrote:
> 2011/5/13 viresh kumar <viresh.kumar-qxv4g6HH51o@public.gmane.org>:
> 
>> amba/pl022 and my dma driver dw_dmac.c, both have registered init() routines
>> with subsys_initcall(). Now at bootup, spi boots up before DMA and so DMA
>> channels are never available at spi probe.
>>
>> What should be done to solve this issue?
> 
> If you check drivers/dma/ste_dma40.c you can see that our solution was to
> simply move the DMA engine to arch_initcall().
> 
> Which sort of makes sense for a DMA engine.
> 
> Does this work for dw_dmac.c?

Yes, it worked here too..

-- 
viresh

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WARNING: multiple messages have this Message-ID (diff)
From: viresh.kumar@st.com (viresh kumar)
To: linux-arm-kernel@lists.infradead.org
Subject: [QUERY] amba/pl022: DMA channel allocation always fail.
Date: Mon, 16 May 2011 10:15:36 +0530	[thread overview]
Message-ID: <4DD0ABF0.3020707@st.com> (raw)
In-Reply-To: <BANLkTinMH9TpTTzqoMPS7JZUBRss3pScWg@mail.gmail.com>

On 05/13/2011 08:01 PM, Linus Walleij wrote:
> 2011/5/13 viresh kumar <viresh.kumar@st.com>:
> 
>> amba/pl022 and my dma driver dw_dmac.c, both have registered init() routines
>> with subsys_initcall(). Now at bootup, spi boots up before DMA and so DMA
>> channels are never available at spi probe.
>>
>> What should be done to solve this issue?
> 
> If you check drivers/dma/ste_dma40.c you can see that our solution was to
> simply move the DMA engine to arch_initcall().
> 
> Which sort of makes sense for a DMA engine.
> 
> Does this work for dw_dmac.c?

Yes, it worked here too..

-- 
viresh

  parent reply	other threads:[~2011-05-16  4:45 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-13 12:01 [QUERY] amba/pl022: DMA channel allocation always fail viresh kumar
2011-05-13 12:01 ` viresh kumar
2011-05-13 14:31 ` Linus Walleij
2011-05-13 14:31   ` Linus Walleij
     [not found]   ` <BANLkTinMH9TpTTzqoMPS7JZUBRss3pScWg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-05-16  4:45     ` viresh kumar [this message]
2011-05-16  4:45       ` viresh kumar

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