On Thu, Oct 10, 2019 at 09:49:12AM +0100, Russell King - ARM Linux admin wrote:
Hi Greg,
On 5th October, Christian Zigotzky chzigotzky@xenosoft.de reported a problem with this on PowerPC (at a guess, it looks like there's a PowerPC user of this where the DT does not mark the device as dma-coherent, but the hardware requires it to be DMA coherent.)
However, despite sending a reply to him within minutes of his email arriving, I've heard nothing since, so there's been no progress on working out what is really going on.
Given that the reporter hasn't responded to my reply, I'm not sure what we should be doing with this... maybe the reporter has solved his problem, maybe he was using an incorrect DT, we just don't know.
Let's just leave this in, and if this did cause a problem, whatever fix is made will be sent to Linus and we can then take that fix into stable as well.
thanks,
greg k-h