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drivers/pc80/tpm: Disable device if TPM not present

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If the TPM is not detected in the system it may	mean it	is inactive
due to enabled ME with active PTT. In such case, the chipset will route
the TPM	traffic to PTT CRB TPM on Intel systems.

If TPM is not probed, disable the PC80 TPM device driver, so that
coreboot will not generate improper SSDT ACPI table.

Change-Id: I05972ad74a36abaafa2f17a16f09710550a3a3f3
Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80455
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>
This commit is contained in:
Michał Żygowski
2024-02-13 15:43:26 +01:00
committed by Felix Held
parent fb2c09d516
commit 3742308875
1 changed files with 9 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
src/drivers/pc80/tpm/tis.c
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@@ -905,11 +905,16 @@ static struct pnp_info pnp_dev_info[] = {
static void enable_dev(struct device *dev)
{
if (CONFIG(TPM))
pnp_enable_devices(dev, &lpc_tpm_ops,
ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
else
if (CONFIG(TPM)) {
if (pc80_tis_probe(NULL) == NULL) {
dev->enabled = 0;
return;
}
pnp_enable_devices(dev, &lpc_tpm_ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
} else {
pnp_enable_devices(dev, &noop_tpm_ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
}
}
struct chip_operations drivers_pc80_tpm_ops = {