Commit af402ee3 authored by Stefan Mahnke-Hartmann's avatar Stefan Mahnke-Hartmann Committed by Jarkko Sakkinen
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tpm: Add field upgrade mode support for Infineon TPM2 modules 



TPM2_GetCapability with a capability that has the property type value
of TPM_PT_TOTAL_COMMANDS returns a zero length list, when an Infineon
TPM2 is in field upgrade mode.
Since an Infineon TPM2.0 in field upgrade mode returns RC_SUCCESS on
TPM2_Startup, the field upgrade mode has to be detected by
TPM2_GetCapability.

Signed-off-by: default avatarStefan Mahnke-Hartmann <stefan.mahnke-hartmann@infineon.com>
Reviewed-by: default avatarJarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: default avatarJarkko Sakkinen <jarkko@kernel.org>
parent e57b2523

drivers/char/tpm/tpm2-cmd.c

+5 −1
Original line number Diff line number Diff line
@@ -754,7 +754,11 @@ int tpm2_auto_startup(struct tpm_chip *chip) 
	rc = tpm2_get_cc_attrs_tbl(chip);



out:

	if (rc == TPM2_RC_UPGRADE) {

	/*

	 * Infineon TPM in field upgrade mode will return no data for the number

	 * of supported commands.

	 */

	if (rc == TPM2_RC_UPGRADE || rc == -ENODATA) {

		dev_info(&chip->dev, "TPM in field upgrade mode, requires firmware upgrade\n");

		chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE;

		rc = 0;