Hi, On Sun, Feb 08, 2015 at 02:51:16PM -0700, Joseph Kogut wrote: > I have an Intel Valleyview/Baytrail based device (specifically a Dell > Venue 8 Pro 5830) that I'd like to be able to use the Linux Gadget > subsystem on, but it seems that the controller isn't currently > supported. I'm running the 3.19rc7 mainline release. > > The device has a micro AB connector. Based on my experiences with a > similar (Merrifield) platform using Intel's own out of tree patchset > that had working DRD support using a modified DWC3 driver, I suspected > that the Baytrail platform I'm working on would also use the DWC3 > driver. > > The output of "lspci -nn" shows: > > > 00:14.0 USB controller [0c03]: Intel Corporation Atom Processor > > Z36xxx/Z37xxx Series USB xHCI [8086:0f35] (rev 09) hmm... looking at what we support today we for PCI, we support Baytrail, Merrifield, SPTLP, SPTH, BSW (whatever these last three are) and AMD NL. However Baytrail is reported as 0x0f37, not 0x0f35. If you have a micro-AB and then it ought to support peripheral mode. I have a feeling the problem you're having is the same David Cohen (in Cc) has been trying to support upstream. The SoC has two controllers inside, one is peripheral only while the other is host only; there's discrete mux in front of them to mux the data lines to one or the other controller. David, is this what's going on ? > Also, a string in the ACPI table tells me that the device uses a > Synopsys XHCI core, though I'm not sure if it's DRD capable, or host > only. > > > _DDN.Baytrail XHCI controller (Synopsys core/OTG) > > > I tried adding the controller's PCI ID to drivers/usb/dwc3/dwc3-pci.c, > and upon rebooting, the DWC3 module loaded, but reported: > > > [ 5.962605] dwc3 dwc3.0.auto: this is not a DesignWare USB3 DRD Core > > > I don't know if this is the result of Dell messing with the ACPI > table, as they seem prone to do, making the otherwise compatible > hardware undetected by the proper driver, or if I'm just barking up > the wrong tree. I think it's premature to file a bug report, > considering the fact that I'm not yet sure this controller uses the > DWC3 core. > > Attached is the acpi dump from the device in question. > > Thank you for your time, > Joseph -- balbi
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