[coreboot-gerrit] Change in coreboot[master]: [NOTFORMERGE]: drivers/pc80/tpm: Probe for tpm multiple times

[Patrick Rudolph (Code Review)]

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/42510 )

Change subject: [NOTFORMERGE]: drivers/pc80/tpm: Probe for tpm multiple times
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[NOTFORMERGE]: drivers/pc80/tpm: Probe for tpm multiple times

Change-Id: Icdd675c0978173755d9ee18c20d8c314c1537a7a
Signed-off-by: Patrick Rudolph 
---
M src/drivers/pc80/tpm/tis.c
1 file changed, 5 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/10/42510/1

diff --git a/src/drivers/pc80/tpm/tis.c b/src/drivers/pc80/tpm/tis.c
index 185df34..ef556fe 100644
--- a/src/drivers/pc80/tpm/tis.c
+++ b/src/drivers/pc80/tpm/tis.c
@@ -393,7 +393,11 @@
    if (vendor_dev_id)
    	return 0;  /* Already probed. */

-	didvid = tpm_read_did_vid(0);
+	for (i = 0; i < 10000; i++) {
+		didvid = tpm_read_did_vid(0);
+		if (didvid && didvid != 0xffffffff)
+			break;
+	}
    if (!didvid || (didvid == 0xffffffff)) {
    	printf("%s: No TPM device found\n", __FUNCTION__);
    	return TPM_DRIVER_ERR;