On Tue, 2014-07-22 at 12:19 +0100, Scott Ashcroft wrote: > On Tue, 2014-07-22 at 11:52 +0300, Andy Shevchenko wrote: [] > > commit c78b0830667a7e7c1f0ca65b76b33166a84806b3 "ACPI / LPSS: custom power domain for LPSS" > > I'm running 3.16-rc5 so that commit is there. > I'm currently running the packaged kernel from Debian experimental as building anything was difficult until I figured out which module to blacklist. > I'll be able to build kernels if we need to try some patches. Good to hear this, but first one. We used to have a bug when LPSS devices went back from suspend with wrong settings. It should be fixed there. Apparently you have something new we can't reproduce on the development boards. > > > I'd like some advice on how this should be fixed: > > > > > > I see that some very similar chipsets would cause the > > > i2c_designware-pci driver to be loaded where as mine loads the > > > platform device. > > > > You laptop seems to use ACPI, meanwhile other PCI mode for some devices > > inside (LPSS). (*) > > > > > So is the correct fix to get some PCI ids and settings added to the > > > PCI driver? > > > > I'm pretty sure you don't need this. > I was pretty sure that was the case as I can't see a PCI device which would match but just wanted to check. If I understood you correctly in (*), your laptop using ACPI, that explains why you have platform driver loaded instead of PCI one. > > > Or should I be looking to add a DMI based blacklist to stop the i2c > > > bus being detected at all. So, I'm a bit confused now. Which module you blacklisted eventually? dw_dmac or i2c-designware-platform? > > > Or is this just a bug in the dw_dmac module. If so how can I get any > > > debug out of it during the rmmod? I don't think you may get much from the rmmod stage. Most of debug messages are for runtime: enabling them via dw_dmac_core.dyndbg in kernel cmdline (if built-in), or modprobe dw_dmac_core dyndbg. You have to have CONFIG_DYNAMIC_DEBUG=y in the kernel configuration. -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxx> Intel Finland Oy -- 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
