tpm: add possible traces to analyze buffers returned by the TPM

When debugging, it is welcome to get more information about what the TPM
returns. Add the possibility to print the packets received to show their
exact content.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

lib/tpm-common.c

@@ -153,6 +153,7 @@ u32 tpm_sendrecv_command(const void *command, void *response, size_t *size_ptr)
 	int err, ret;
 	u8 response_buffer[COMMAND_BUFFER_SIZE];
 	size_t response_length;
+	int i;
 
 	if (response) {
 		response_length = *size_ptr;
@@ -172,7 +173,14 @@ u32 tpm_sendrecv_command(const void *command, void *response, size_t *size_ptr)
 	if (size_ptr)
 		*size_ptr = response_length;
 
-	return tpm_return_code(response);
+	ret = tpm_return_code(response);
+
+	log(LOGC_NONE, LOGL_DEBUG, "TPM response [ret:%d]: ", ret);
+	for (i = 0; i < response_length; i++)
+		log(LOGC_NONE, LOGL_DEBUG, "%02x ", ((u8 *)response)[i]);
+	log(LOGC_NONE, LOGL_DEBUG, "\n");
+
+	return ret;
 }
 
 int tpm_init(void)