tpm: tpm_tis: add error logging for data transfer

Add logging to more easily determine reason for transmit failure

Cc: stable@vger.kernel.org # v6.6+
Fixes: 280db21e153d8 ("tpm_tis: Resend command to recover from data transfer errors")
Signed-off-by: Jacqueline Wong <jacqwong@google.com>
Signed-off-by: Jordan Hand <jhand@google.com>
Link: https://lore.kernel.org/r/20260415160006.2275325-2-jacqwong@google.com
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index e2a1769081b1af5f02185c9f35e82b849ffb4298..acb91bf1e5f5eed7d40c549bd022a0bf4ad59c64 100644 (file)
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -471,6 +471,8 @@ static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
                status = tpm_tis_status(chip);
                if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
                        rc = -EIO;
+                       dev_err(&chip->dev, "TPM_STS_DATA_EXPECT should be set. sts = 0x%08x\n",
+                               status);
                        goto out_err;
                }
        }
@@ -491,6 +493,8 @@ static int tpm_tis_send_data(struct tpm_chip *chip, const u8 *buf, size_t len)
        status = tpm_tis_status(chip);
        if (!itpm && (status & TPM_STS_DATA_EXPECT) != 0) {
                rc = -EIO;
+               dev_err(&chip->dev, "TPM_STS_DATA_EXPECT should be unset. sts = 0x%08x\n",
+                       status);
                goto out_err;
        }