Re: [tpmdd-devel] [PATCH] tpm, tpm_crb: remove redundant CRB_FL_CRB_START flag

[Jarkko Sakkinen]

On Wed, Oct 19, 2016 at 10:28:29AM +0000, Winkler, Tomas wrote:
> 
> 
> > 
> > On Mon, Oct 17, 2016 at 11:42:24PM +0300, Jarkko Sakkinen wrote:
> > > Because all the existing hardware have HID MSFT0101 we end up always
> > > setting CRB_FL_CRB_START flag as a workaround for 4th Gen Core CPUs.
> > > Even if ACPI start is used, the driver will always issue also CRB start.
> 
> Do you have some more historical data about this fix, I was wondering
> about this quirk before, when restructuring the start method parsing.
> The description is ' in practice seems to require both'  sounds not
> certain about the root cause of this.

I have a 4th Gen Core NUC where I experienced this issue. It reported
requiring only ACPI start but actually required ACPI + CRB start. The
comment could have been better.

/Jarkko