On Mon, Dec 18, 2017 at 01:19:02PM -0700, Jason Gunthorpe wrote: > On Mon, Dec 18, 2017 at 07:34:29PM +0000, Shaikh, Azhar wrote: > > > >IIUC, if CLKRUN_EN is enabled, then all the devices attached to the > > >LPC bus have to support the CLKRUN protocol. My guess is that on > > >some Braswell systems LPC power management is enabled but the TPM > > >device doesn't have CLKRUN support. > > > > I think this is what might be happening here. > > That makes it a BIOS bug, not a chipset bug, and we shouldn't be > trying to fix it like this in Linux. > > Based on the original discussion I always thought this was an Intel > chipset bug and applies to all cases. > > Jason It would not be first time when some BIOS issues are circumvented in the kernel. /Jarkko
