When the TPM signals wait states, the driver has to repeat the last byte
until the TPM stops signaling wait states and accepts that byte. It should
not send a dummy byte, even though that might work with some TPM
implementations.
Signed-off-by: Alexander Steffen <Alexander.Steffen@xxxxxxxxxxxx>
---
drivers/char/tpm/tpm_tis_spi.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/char/tpm/tpm_tis_spi.c b/drivers/char/tpm/tpm_tis_spi.c
index c4f511b..2758b41 100644
--- a/drivers/char/tpm/tpm_tis_spi.c
+++ b/drivers/char/tpm/tpm_tis_spi.c
@@ -88,9 +88,8 @@ static int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len,
if ((phy->iobuf[3] & 0x01) == 0) {
// handle SPI wait states
- phy->iobuf[0] = 0;
-
for (i = 0; i < TPM_RETRY; i++) {
+ phy->iobuf[0] = addr;
spi_xfer.len = 1;
spi_message_init(&m);
spi_message_add_tail(&spi_xfer, &m);
--
2.7.4
