Re: [PATCH] tpm_tis: Re-enable interrupts upon resume

From: Jiri Slaby
Date: Sat Feb 26 2011 - 06:46:26 EST

On 02/22/2011 08:49 PM, Stefan Berger wrote:
> Below patch applies to the tip of the git tree.
> This patch makes sure that if the TPM TIS interface is run in interrupt
> mode (rather than polling mode) that the interrupts are enabled in the
> TPM's interrupt enable register which may either have been cleared by
> the TPM's TIS loosing its state during device sleep in ACPI S3 (suspend)
> or by the BIOS, which upon resume sends a TPM_Startup() command to the
> TPM, and may run the TPM in polling mode and leave the TIS interrupts
> disabled once it transfers control to the OS again.
> Problem is, I don't currently have a machine running the TPM in
> interrupt mode. I found this through a self-built TPM device model for
> Qemu and SeaBIOS patches, where this does resolve a problem upon resume.
> You may want to check if your TPM runs with interrupts by doing
> cat /proc/interrupts | grep -i tpm

No, this is empty output.

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