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authorTobias Diedrich <ranma+openocd@tdiedrich.de>2017-02-10 00:28:45 +0100
committerDuncan Laurie <dlaurie@chromium.org>2017-02-14 18:59:30 +0100
commit36537f113cf38f3b29cf5a51d563e8278f4683d8 (patch)
tree2b9f9a9ac744d5d0791fe77969e87681717c07ce /src
parent03e9d6aa13f474ab980779366b7a6c8593721be6 (diff)
downloadcoreboot-36537f113cf38f3b29cf5a51d563e8278f4683d8.tar.xz
drivers/pc80/tpm: Update default acpi path
The existing default path of PCI0.LPCB is missing the \_SB prefix and prevents Linux from detecting the TPM. This is assuming that normally the LPCB device is most commonly on \_SB.PCI0.LPCB. SSDT excerpt without the patch: """ DefinitionBlock ("", "SSDT", 2, "CORE ", "COREBOOT", 0x0000002A) { External (_SB_.PCI0.GFX0, DeviceObj) [...] External (_SB_.PCI0.SATA, DeviceObj) External (PCI0.LPCB, DeviceObj) [...] Scope (PCI0.LPCB) { Device (TPM) [...] Scope (\_SB.PCI0.GFX0) { Method (_DOD, 0, NotSerialized) // _DOD: Display Output Devices [...] """ SSDT excerpt with the patch: """ DefinitionBlock ("", "SSDT", 2, "CORE ", "COREBOOT", 0x0000002A) { External (_SB_.PCI0.GFX0, DeviceObj) [...] External (_SB_.PCI0.LPCB, DeviceObj) [...] External (_SB_.PCI0.SATA, DeviceObj) [...] Scope (\_SB.PCI0.LPCB) { Device (TPM) [...] Scope (\_SB.PCI0.GFX0) { Method (_DOD, 0, NotSerialized) // _DOD: Display Output Devices [...] """ After the patch the TPM shows up in /sys/bus/acpi/devices/PNP0C31:00. Previously it was missing and not detected by the kernel. Change-Id: I615b4873ca829a859211403c84234d43d60f2243 Signed-off-by: Tobias Diedrich <ranma+coreboot@tdiedrich.de> Reviewed-on: https://review.coreboot.org/18315 Tested-by: build bot (Jenkins) Reviewed-by: Nicola Corna <nicola@corna.info> Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com> Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Diffstat (limited to 'src')
-rw-r--r--src/drivers/pc80/tpm/tpm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/drivers/pc80/tpm/tpm.c b/src/drivers/pc80/tpm/tpm.c
index 83dc92348f..3c3e491aa3 100644
--- a/src/drivers/pc80/tpm/tpm.c
+++ b/src/drivers/pc80/tpm/tpm.c
@@ -876,7 +876,7 @@ static void lpc_tpm_fill_ssdt(struct device *dev)
CONFIG_TPM_TIS_BASE_ADDRESS, 0x5000);
if (!path) {
- path = "PCI0.LPCB";
+ path = "\\_SB_.PCI0.LPCB";
printk(BIOS_DEBUG, "Using default TPM ACPI path: '%s'\n", path);
}