drivers/tpm/cr50: Add TPM IRQ timeout Kconfig option

The current 10ms timeout for SPI TPM IRQ is not enough for platforms
using ti50 (such as corsola). Therefore, introduce a new Kconfig option
'GOOGLE_TPM_IRQ_TIMEOUT_MS'.

For platforms using cr50, we need to support legacy pre-ready-IRQ cr50
factory images during the initial boot, so the timeout remains 100ms for
I2C TPM and 10ms for SPI TPM. For all the other platforms using ti50,
the default timeout is increased to 750ms, as suggested by the ti50 team
(apronin@google.com).

BUG=b:232327704
TEST=emerge-corsola coreboot
BRANCH=none

Change-Id: I8dbb919e4a421a99a994913613a33738a49f5956
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64412
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/security/tpm/tss/vendor/cr50/Kconfig b/src/security/tpm/tss/vendor/cr50/Kconfig
index 1fad3c0686..547f0fde3e 100644
--- a/src/security/tpm/tss/vendor/cr50/Kconfig
+++ b/src/security/tpm/tss/vendor/cr50/Kconfig
@@ -40,4 +40,14 @@ config TI50_FIRMWARE_VERSION_NOT_SUPPORTED
 	  FW < 0.0.15. The config will be removed once all Ti50 stocks are updated to
 	  0.0.15 or higher.
 
+config GOOGLE_TPM_IRQ_TIMEOUT_MS
+	int
+	default 100 if TPM_GOOGLE_CR50 && I2C_TPM
+	default 10 if TPM_GOOGLE_CR50
+	default 750
+	help
+	  Timeout in milliseconds for waiting for TPM IRQ. Default to 100ms/10ms on platforms
+	  using Cr50 in order to support legacy pre-ready-IRQ cr50 factory images. Default to
+	  750ms otherwise.
+
 endif