Re: [PATCH] tpm/tpm_tis: Disable interrupts for Lenovo P620 devices

[Jarkko Sakkinen]

On Fri Aug 4, 2023 at 8:08 PM EEST, Jonathan McDowell wrote:
> The Lenovo ThinkStation P620 suffers from an irq storm issue like
> various other Lenovo machines, so add an entry for it to
> tpm_tis_dmi_table and force polling.
>
> It is worth noting that 481c2d14627de8ecbb54dd125466e4b4a5069b47
> (tpm,tpm_tis: Disable interrupts after 1000 unhandled IRQs) does not
> seem to fix the problem on this machine, but setting
> tpm_tis.interrupts=0 on the kernel command line does.
>
> Cc: stable@xxxxxxxxxxxxxxx # v6.4+
> Fixes: e644b2f498d2 ("tpm, tpm_tis: Enable interrupt test")
> Signed-off-by: Jonathan McDowell <noodles@xxxxxxxx>
> ---
>  drivers/char/tpm/tpm_tis.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index cc42cf3de960..0cbd745374dc 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -162,6 +162,14 @@ static const struct dmi_system_id tpm_tis_dmi_table[] = {
>  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad L590"),
>  		},
>  	},
> +	{
> +		.callback = tpm_tis_disable_irq,
> +		.ident = "ThinkStation P620",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> +			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkStation P620"),
> +		},
> +	},
>  	{
>  		.callback = tpm_tis_disable_irq,
>  		.ident = "UPX-TGL",

Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>

BR, Jarkko