Change in coreboot[master]: spi/tpm: Clear pending irqs during tpm2_init

[Shelley Chen (Code Review)]

Shelley Chen has uploaded this change for review. ( https://review.coreboot.org/22909

Change subject: spi/tpm: Clear pending irqs during tpm2_init
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spi/tpm: Clear pending irqs during tpm2_init

Seeing some instances were cr50 spi driver is starting a new
transaction without getting a ready interrupt from cr50, which means
that there are pending interrupts.  Clearing these to be sure there
are not any stale irqs for the next transaction.

BUG=b:69567837
BRANCH=None
TEST=run FAFT and see if any 0x2b recovery boots occur

Change-Id: Ie099da9f2b3c4da417648ae10a5ba356b7a093ff
Signed-off-by: Shelley Chen 
---
M src/drivers/spi/tpm/tpm.c
1 file changed, 3 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/09/22909/1

diff --git a/src/drivers/spi/tpm/tpm.c b/src/drivers/spi/tpm/tpm.c
index e1fec28..ceec0b0 100644
--- a/src/drivers/spi/tpm/tpm.c
+++ b/src/drivers/spi/tpm/tpm.c
@@ -429,6 +429,9 @@

memcpy(spi_slave, spi_if, sizeof(*spi_if));

+	/* clear any pending irqs */
+	tis_plat_irq_status();
+
    /*
     * 150 ms should be enough to synchronize with the TPM even under the
     * worst nested reset request conditions. In vast majority of cases