On Thu, Aug 29, 2019 at 05:40:40PM +0300, Jarkko Sakkinen wrote: > On Tue, Aug 27, 2019 at 05:46:21PM -0700, Jerry Snitselaar wrote: > > There was revealed a bug in the STM TPM chipset used in Dell R415s. > > Bug is observed so far only on chipset firmware 1.2.8.28 > > (1.2 TPM, device-id 0x0, rev-id 78). After some number of > > operations chipset hangs and stays in inconsistent state: > > > > tpm_tis 00:09: Operation Timed out > > tpm_tis 00:09: tpm_transmit: tpm_send: error -5 > > > > Durations returned by the chip are the same like on other > > firmware revisions but apparently with specifically 1.2.8.28 fw > > durations should be reset to 2 minutes to enable tpm chip work > > properly. No working way of updating firmware was found. > > > > This patch adds implementation of ->update_durations method > > that matches only STM devices with specific firmware version. > > > > Cc: Peter Huewe <peterhuewe@xxxxxx> > > Cc: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> > > Cc: Jason Gunthorpe <jgg@xxxxxxxx> > > Signed-off-by: Alexey Klimov <aklimov@xxxxxxxxxx> > > Signed-off-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx> > > --- > > v2: Make suggested changes from Jarkko > > - change struct field name to durations from durs > > - formatting cleanups > > - turn into void function like update_timeouts and > > use chip->duration_adjusted to track whether adjustment occurred. > > The code repetition looks horrible so I wrote a patch that should help: > > https://patchwork.kernel.org/patch/11121475/ > > Read the remar that prepends the diffstat. Forgot from that remark that I did not have TPM 1.x available at hand (WFH today) so please also review and test it. /Jrakko
