Before we can start measuring the TPM must be cleared. Do this in the
post_probe() method of the uclass.
Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com>
---
v2:
tpm_startup2() is not available on all boards.
tpm_startup() takes care of translating the call.
---
drivers/tpm/tpm-uclass.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/tpm/tpm-uclass.c b/drivers/tpm/tpm-uclass.c
index f67fe1019b..abd9ce35e8 100644
--- a/drivers/tpm/tpm-uclass.c
+++ b/drivers/tpm/tpm-uclass.c
@@ -11,6 +11,7 @@
#include <log.h>
#include <linux/delay.h>
#include <linux/unaligned/be_byteshift.h>
+#include <tpm_api.h>
#include <tpm-v1.h>
#include <tpm-v2.h>
#include "tpm_internal.h"
@@ -136,6 +137,17 @@ int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf,
size_t send_size,
return 0;
}
+static int dm_tpm_post_probe(struct udevice *dev)
+{
+ /*
+ * Clearing the TPM state is only possible once after a hard reset.
+ * As we do not know if the TPM has been cleared by a prior boot stage
+ * ignore the return value here.
+ */
+ tpm_startup(dev, TPM_ST_CLEAR);
+ return 0;
+}
+
UCLASS_DRIVER(tpm) = {
.id = UCLASS_TPM,
.name = "tpm",
@@ -143,5 +155,6 @@ UCLASS_DRIVER(tpm) = {
#if CONFIG_IS_ENABLED(OF_REAL)
.post_bind = dm_scan_fdt_dev,
#endif
+ .post_probe = dm_tpm_post_probe,
.per_device_auto = sizeof(struct tpm_chip_priv),
};
--
2.32.0
