There was revealed a bug in the STM TPM chipset used in Dell R415s.
Bug is observed so far only on chipset firmware 1.2.8.28
(1.2 TPM, device-id 0x0, rev-id 78). After some number of
operations chipset hangs and stays in inconsistent state:
tpm_tis 00:09: Operation Timed out
tpm_tis 00:09: tpm_transmit: tpm_send: error -5
Durations returned by the chip are the same like on other
firmware revisions but apparently with specifically 1.2.8.28 fw
durations should be reset to 2 minutes to enable tpm chip work
properly. No working way of updating firmware was found.
This patch adds implementation of ->update_durations method
that matches only STM devices with specific firmware version.
Cc: Jerry Snitselaar <jsnitsel@xxxxxxxxxx>
Signed-off-by: Alexey Klimov <aklimov@xxxxxxxxxx>
---
drivers/char/tpm/tpm_tis_core.c | 90 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 90 insertions(+)
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index d2345d9fd7b5..e0bdca647460 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -514,6 +514,95 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
return rc;
}
+struct tis_vendor_durations_override {
+ u32 did_vid;
+ struct tpm_version_t tpm_version;
+ unsigned long durs[3];
+};
+
+static
+const struct tis_vendor_durations_override vendor_dur_overrides[] = {
+ /* STMicroelectronics 0x104a */
+ { 0x0000104A,
+ { 1, 2, 8, 28 },
+ { (2 * 60 * HZ), (2 * 60 * HZ), (2 * 60 * HZ) } },
+};
+
+static bool tpm_tis_update_durations(struct tpm_chip *chip,
+ unsigned long *duration_cap)
+{
+ struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
+ u32 did_vid;
+ int i, rc;
+ cap_t cap;
+
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, true);
+
+ rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid);
+ if (rc < 0)
+ goto out;
+
+ for (i = 0; i != ARRAY_SIZE(vendor_dur_overrides); i++) {
+ if (vendor_dur_overrides[i].did_vid != did_vid)
+ continue;
+
+ /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
+ rc = tpm_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
+ "attempting to determine the 1.2 version",
+ sizeof(cap.tpm_version_1_2));
+ if (!rc) {
+ if ((cap.tpm_version_1_2.Major ==
+ vendor_dur_overrides[i].tpm_version.Major) &&
+ (cap.tpm_version_1_2.Minor ==
+ vendor_dur_overrides[i].tpm_version.Minor) &&
+ (cap.tpm_version_1_2.revMajor ==
+ vendor_dur_overrides[i].tpm_version.revMajor) &&
+ (cap.tpm_version_1_2.revMinor ==
+ vendor_dur_overrides[i].tpm_version.revMinor)) {
+
+ memcpy(duration_cap,
+ vendor_dur_overrides[i].durs,
+ sizeof(vendor_dur_overrides[i].durs));
+ rc = true;
+ goto out;
+ }
+ } else {
+ rc = tpm_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
+ "attempting to determine the 1.1 version",
+ sizeof(cap.tpm_version));
+ if (rc) {
+ rc = false;
+ goto out;
+ }
+ if ((cap.tpm_version.Major ==
+ vendor_dur_overrides[i].tpm_version.Major) &&
+ (cap.tpm_version.Minor ==
+ vendor_dur_overrides[i].tpm_version.Minor) &&
+ (cap.tpm_version.revMajor ==
+ vendor_dur_overrides[i].tpm_version.revMajor) &&
+ (cap.tpm_version.revMinor ==
+ vendor_dur_overrides[i].tpm_version.revMinor)) {
+
+ memcpy(duration_cap,
+ vendor_dur_overrides[i].durs,
+ sizeof(vendor_dur_overrides[i].durs));
+ rc = true;
+ goto out;
+ }
+ }
+ }
+
+ rc = false;
+
+out:
+ if (chip->ops->clk_enable != NULL)
+ chip->ops->clk_enable(chip, false);
+
+ return rc;
+}
+
+
struct tis_vendor_timeout_override {
u32 did_vid;
unsigned long timeout_us[4];
@@ -847,6 +936,7 @@ static const struct tpm_class_ops tpm_tis = {
.send = tpm_tis_send,
.cancel = tpm_tis_ready,
.update_timeouts = tpm_tis_update_timeouts,
+ .update_durations = tpm_tis_update_durations,
.req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
.req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
.req_canceled = tpm_tis_req_canceled,
--
2.14.4
