Subject: [PATCH 03/03] omap hsmmc: adaptation of sdma descriptor autoloading feature

From: [email-masked] (Tony Lindgren)
Date: Thu, 11 Mar 2010 10:39:44 -0800

* Venkatraman S <[email-masked]> [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