From: Tony Lindgren <tony@atomide.com>
To: Venkatraman S <svenkatr@ti.com>
Cc: linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-mmc@vger.kernel.org,
Adrian Hunter <adrian.hunter@nokia.com>,
Madhusudhan Chikkature <madhu.cr@ti.com>
Subject: Re: [PATCH 03/03] omap hsmmc: adaptation of sdma descriptor autoloading feature
Date: Thu, 11 Mar 2010 10:39:44 -0800 [thread overview]
Message-ID: <20100311183944.GJ2900@atomide.com> (raw)
In-Reply-To: <618f0c911003110708s5015f2bftb443b9ea57cb6477@mail.gmail.com>
* Venkatraman S <svenkatr@ti.com> [100311 07:04]:
> Tony Lindgren wrote:
> >
> > Does the driver still work in PIO mode?
> >
> > We need to have the drivers capable to fail over to PIO mode
> > as the DMA channels can run out.
> >
>
> The driver doesn't have an automatic fallback to PIO,
> even without my patch. A error return from omap_request_dma is
> propogated all the way back to the transfer request.
> The decision to use_dma (the variable) is unaltered.
OK, that might explain some nasty surprises then..
With these patches, does the driver still work in PIO mode though?
> Infact, it would be easier to implement a runtime fallback after
> this patch is
> merged as I have separated out the capability and runtime selection.
> (dma_caps and dma_in_use).
Sounds good to me, thanks for looking into it.
Regards,
Tony
WARNING: multiple messages have this Message-ID (diff)
From: tony@atomide.com (Tony Lindgren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 03/03] omap hsmmc: adaptation of sdma descriptor autoloading feature
Date: Thu, 11 Mar 2010 10:39:44 -0800 [thread overview]
Message-ID: <20100311183944.GJ2900@atomide.com> (raw)
In-Reply-To: <618f0c911003110708s5015f2bftb443b9ea57cb6477@mail.gmail.com>
* Venkatraman S <svenkatr@ti.com> [100311 07:04]:
> Tony Lindgren wrote:
> >
> > Does the driver still work in PIO mode?
> >
> > We need to have the drivers capable to fail over to PIO mode
> > as the DMA channels can run out.
> >
>
> The driver doesn't have an automatic fallback to PIO,
> even without my patch. A error return from omap_request_dma is
> propogated all the way back to the transfer request.
> The decision to use_dma (the variable) is unaltered.
OK, that might explain some nasty surprises then..
With these patches, does the driver still work in PIO mode though?
> Infact, it would be easier to implement a runtime fallback after
> this patch is
> merged as I have separated out the capability and runtime selection.
> (dma_caps and dma_in_use).
Sounds good to me, thanks for looking into it.
Regards,
Tony
next prev parent reply other threads:[~2010-03-11 18:38 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-10 14:12 [PATCH 03/03] omap hsmmc: adaptation of sdma descriptor autoloading feature Venkatraman S
2010-03-10 14:12 ` Venkatraman S
2010-03-10 22:41 ` Tony Lindgren
2010-03-10 22:41 ` Tony Lindgren
2010-03-11 15:08 ` Venkatraman S
2010-03-11 15:08 ` Venkatraman S
2010-03-11 18:39 ` Tony Lindgren [this message]
2010-03-11 18:39 ` Tony Lindgren
2010-03-12 8:18 ` Venkatraman S
2010-03-12 8:18 ` Venkatraman S
-- strict thread matches above, loose matches on Subject: below --
2010-03-01 11:27 Venkatraman S
2010-03-01 11:27 ` Venkatraman S
2010-03-11 1:01 ` Madhusudhan
2010-03-11 1:01 ` Madhusudhan
2010-03-11 10:52 ` Venkatraman S
2010-03-11 10:52 ` Venkatraman S
2010-03-11 16:27 ` Madhusudhan
2010-03-11 16:27 ` Madhusudhan
2010-03-11 17:42 ` Venkatraman S
2010-03-11 17:42 ` Venkatraman S
2010-03-12 2:29 ` Madhusudhan
2010-03-12 2:29 ` Madhusudhan
2010-03-12 6:03 ` Venkatraman S
2010-03-12 6:03 ` Venkatraman S
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