On Tue, Jan 17, 2017 at 08:31:03AM -0800, Tony Lindgren wrote: > * Bin Liu <b-liu@xxxxxx> [170117 08:22]: > > On Tue, Jan 17, 2017 at 08:11:39AM -0800, Tony Lindgren wrote: > > > * Bin Liu <b-liu@xxxxxx> [170117 05:00]: > > > > On Mon, Jan 16, 2017 at 03:54:29PM -0800, Tony Lindgren wrote: > > > > > Anyways, for the -rc series oops, we can just leave out the WARN_ON > > > > > parts for now until drivers/usb/musb/musb_cppi41.c is fixed too. > > > > > > > > Giving that cppi is a submodule inside the usb subsysytem and it does't > > > > have separate power rail or clock, what is the benefit to adding runtime > > > > PM in the cppi driver? > > > > > > Good question. We need at least minimal support to enable things for > > > probe and then idle cppi41 properly if only cppi41.ko is loaded with no > > > USB modules. > > > > > > But yeah now that musb does runtime PM based on the cable detection, we > > > pretty much guarantee that cppi41 is always enabled when USB is in use. > > > > > > And if there are no other devices using cppi41 dma on davinci, we can > > > simplify the PM runtime a bit for cppi41. > > > > This might be a good idea. I didn't have much time to play with this > > cppi41 runtime PM, but it seems I am having more issues than you and > > others seeing. > > What kind of additional issues are you seeing not described in the $subject > patch? I didn't take a note and don't remember if those are in the $subject patch. But - enumeration begining with a reset that the device doesn't accept address X, error code -71; or - console fooding with cppi error code -115 after thumb drive enumeration. Again, I only tried for a few minutes and didn't take a note, since I don't have time to look at this ATM. Regards, -Bin. -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
