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Re: [PATCH] dmaengine: omap-dma: Add support for memcpy

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  Re: [PATCH] dmaengine: omap-dma: Add support for memcpy Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2015-09-08 13:30 +0200
    Re: [PATCH] dmaengine: omap-dma: Add support for memcpy Peter Ujfalusi <peter.ujfalusi@ti.com> - 2015-09-08 14:30 +0200

#1220707 — Re: [PATCH] dmaengine: omap-dma: Add support for memcpy

Hi Peter,

Thank you for the patch.

While trying to port the omap_vout driver to the DMA engine API I noticed that 
the driver makes use of double-indexed transfers, which are not supported by 
the omap-dma driver. I haven't checked in details what would be required, but 
the interleaved API might be a good candidate for this. Do you have any plan 
to add support for double-indexed transfers to the omap-dma driver ?

On Wednesday 22 April 2015 10:34:29 Peter Ujfalusi wrote:
> The sDMA controller is capable of performing memory copy operation. It need
> to be configured to software triggered mode and without HW synchronization.
> The sDMA can copy data which is aligned to 8, 16 or 32 bits.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> ---
>  drivers/dma/omap-dma.c | 51 +++++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 49 insertions(+), 2 deletions(-)

-- 
Regards,

Laurent Pinchart

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#1220736

Laurent,

On 09/08/2015 02:24 PM, Laurent Pinchart wrote:
> Hi Peter,
> 
> Thank you for the patch.
> 
> While trying to port the omap_vout driver to the DMA engine API I noticed that 
> the driver makes use of double-indexed transfers, which are not supported by 
> the omap-dma driver. I haven't checked in details what would be required, but 
> the interleaved API might be a good candidate for this. Do you have any plan 
> to add support for double-indexed transfers to the omap-dma driver ?

If double-indexed transfer support is needed by drivers still using the
legacy/direct sDMA API, then I don't think we have other options..
So far I have not looked at that part and where it would fit.
I'll try to find time to look at this. I hope not in the distant future ;)

> On Wednesday 22 April 2015 10:34:29 Peter Ujfalusi wrote:
>> The sDMA controller is capable of performing memory copy operation. It need
>> to be configured to software triggered mode and without HW synchronization.
>> The sDMA can copy data which is aligned to 8, 16 or 32 bits.
>>
>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
>> ---
>>  drivers/dma/omap-dma.c | 51 +++++++++++++++++++++++++++++++++++++++++++++--
>>  1 file changed, 49 insertions(+), 2 deletions(-)
> 

-- 
Péter
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