Em Wed, 28 Feb 2018 09:49:12 -0500 Devin Heitmueller <dheitmueller@xxxxxxxxxxxxxx> escreveu: > 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. Good to know! I guess then it is worth applying it. Btw, while here, I'm wandering if it should keep using URB_ISO_ASAP flag or not. On my tests, for DVB, it seems to be working both ways. Didn't test analog TV yet. Thanks, Mauro
