On Tue, Feb 27, 2018 at 12:42 PM, Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx> wrote: > While coherent memory is cheap on x86, it has problems on > arm. So, stop using it. > > Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx> > --- > > I wrote this patch in order to check if this would make things better > for ISOCH transfers on Raspberry Pi3. It didn't. Yet, keep using > coherent memory at USB drivers seem an overkill. > > So, I'm actually not sure if we should either go ahead and merge it > or not. > > Comments? Tests? For what it's worth, while I haven't tested this patch you're proposing, I've been running what is essentially the same change in a private tree for several years in order for the device to work better with several TI Davinci SOC platforms. Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com
