Hi,

On 04/12/2016 10:33 PM, Sebastian Andrzej Siewior wrote:

On 04/11/2016 10:10 PM, Peter Hurley wrote:

quoted

On 04/11/2016 11:31 AM, Sebastian Andrzej Siewior wrote:

quoted

On 04/11/2016 07:53 PM, Peter Hurley wrote:

quoted

On 04/11/2016 01:18 AM, John Ogness wrote:

quoted

On 2016-04-05, Peter Hurley [off-list ref] wrote:

quoted

On 03/31/2016 01:41 AM, John Ogness wrote:

[...]

quoted

*am335x*

I am not sure if the limitations are based on the DMA engine or the

quoted

- requires write to tx fifo to trigger tx dma (ie. OMAP_DMA_TX_KICK
  workaround necessitating completely different tx dma completion handler)

This one for instance I don't see on BeagleBoard xM / omap36xx and
DRA7x. Both (not affected) use SDMA instead EDMA. It would be
interesting to see if DRA7x is affected once it uses EDMA.

8250 UART DMA works fine with EDMA as the DMA engine.
As per my testing, am335x + EDMA, am437x + EDMA, dra7xx + EDMA and
dra72x + EDMA require OMAP_DMA_TX_KICK quirk. However when using SDMA
OMAP_DMA_TX_KICK is not needed (I tested on dra7xx platform). So, it can
be concluded that when using EDMA with 8250 UART tx kick is needed.



-- 
Regards
Vignesh