Re: [PATCH] dmaengine: tegra210-adma: fix transfer failure

[Sameer Pujar]

On 6/20/2019 10:13 PM, Jon Hunter wrote:
> On 20/06/2019 17:15, Sameer Pujar wrote:
> >  From Tegra186 onwards OUTSTANDING_REQUESTS field is added in channel
> > configuration register (bits 7:4). ADMA allows a maximum of 8 reads
> > to source and that many writes to target memory be outstanding at any
> > given point of time. If this field is not programmed, DMA transfers
> > fail to happen.
> BTW, I am not sure I follow the above. You say a max of 8 reads to the
> source, however, the field we are programming can have a value of up to
> 15. So does that mean this field should only be programmed with a max of 8?
Yes. As per spec. ADMA allows max value of 8.
> Thanks
> Jon