AM57x Best Way to Copy a DMA-BUF

phillip class

I have the AM57XX EVM with the Linux Processor SDK 2.0.2 from April 2016.

What is the best way to copy a DMA-BUF?

So far, it seems that using the VPE in the AM57XX with V4L2 and without and format conversion will copy it. I do not want to mmap the DMA-BUF file descriptor and memcpy to another.

Is there a different or better way? Thanks.

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Please post which SDK (Linux/Linux-RT/RTOS) you are using.

0 phillip class over 9 years ago in reply to Biser Gatchev-XID

Intellectual 635 points

I have updated the question. Thanks.

0 Yordan Kovachev over 9 years ago in reply to phillip class

TI__Guru**** 161600 points

Hi,

As stated in Documentation/dmaengine/provider there is a DMA_MEMCPY transaction type supported in the kernel. However you state that you do not want to use memcpy, so you could proceed with the method you use now:
"using the VPE in the AM57XX with V4L2 and without and format conversion will copy it"

Best Regards,
Yordan

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AM57x Best Way to Copy a DMA-BUF