On Sat, Apr 15, 2017 at 06:04:05PM +0200, Maciej S. Szmigiero wrote:
> Hi Jarkko,
>
> On 15.04.2017 17:26, Jarkko Sakkinen wrote:
> > From: "Maciej S. Szmigiero" <m...@maciej.szmigiero.name>
> >
> > Since commit 1107d065fdf1 ("tpm_tis: Introduce intermediate layer for
> > TPM access") Atmel 3203 TPM on ThinkPad X61S (TPM firmware version 13.9)
> > no longer works. The initialization proceeds fine until we get and
> > start using chip-reported timeouts - and the chip reports C and D
> > timeouts of zero.
> >
> > It turns out that until commit 8e54caf407b98e ("tpm: Provide a generic
> > means to override the chip returned timeouts") we had actually let
> > default timeout values remain in this case, so let's bring back this
> > behavior to make chips like Atmel 3203 work again.
> >
> > Use a common code that was introduced by that commit so a warning is
> > printed in this case and /sys/class/tpm/tpm*/timeouts correctly says the
> > timeouts aren't chip-original.
> >
> > Fixes: 1107d065fdf1 ("tpm_tis: Introduce intermediate layer for TPM access")
> > Cc: sta...@vger.kernel.org
> > Signed-off-by: Maciej S. Szmigiero <m...@maciej.szmigiero.name>
> > Reviewed-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
> > ---
> > Backport v4.9. Can you test it?
> > drivers/char/tpm/tpm-interface.c | 59
> > ++++++++++++++++++++++------------------
> > drivers/char/tpm/tpm_tis.c | 2 +-
> > drivers/char/tpm/tpm_tis_core.c | 6 ++--
> > drivers/char/tpm/tpm_tis_core.h | 2 +-
> > 4 files changed, 38 insertions(+), 31 deletions(-)
> >
> > diff --git a/drivers/char/tpm/tpm-interface.c
> > b/drivers/char/tpm/tpm-interface.c
> > index 3a9149cf0110..4c914fe25802 100644
> > --- a/drivers/char/tpm/tpm-interface.c
> > +++ b/drivers/char/tpm/tpm-interface.c
> (..)
> > @@ -537,16 +537,15 @@ int tpm_get_timeouts(struct tpm_chip *chip)
> > goto duration;
> > }
> >
> > - if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
> > - be32_to_cpu(tpm_cmd.header.out.length)
> > - != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
> > - return -EINVAL;
> > -
>
> Is this part right?
> These tests weren't removed by this commit as present in the mainline kernel.
>
> Maciej
No it is not right. It is my bad. Sorry about this. My only excuse
is that I was rushing to the Easter holiday and that is not really
a good excuse.
/Jarkko
