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wolfTPM
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Fixes for SPI CS auto-detection on Infineon SLB9670. I was able to reproduce issue on Pi 3b+. First run detects on `/dev/spidev0.1` then finds on `/dev/spidev0.0` afterwards (odd).

pull/102/head
David Garske 2020-07-13 11:16:18 -07:00
parent 6d46b26bde
commit ee3dc75d3e
1 changed files with 16 additions and 12 deletions
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12
examples/tpm_io.c
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@ -262,12 +262,15 @@
#ifdef WOLFTPM_DEBUG_TIMEOUT
printf("SPI Ready Timeout %d\n", TPM_SPI_WAIT_RETRY - timeout);
#endif
if (size != 1 || timeout <= 0) {
close(spiDev);
return TPM_RC_FAILURE;
if (size == 1 && timeout > 0) {
ret = TPM_RC_SUCCESS;
}
}
else {
ret = TPM_RC_SUCCESS;
}
if (ret == TPM_RC_SUCCESS) {
/* Remainder of message */
spi.tx_buf = (unsigned long)&txBuf[TPM_TIS_HEADER_SZ];
spi.rx_buf = (unsigned long)&rxBuf[TPM_TIS_HEADER_SZ];
@ -276,6 +279,7 @@
if (size == (size_t)xferSz - TPM_TIS_HEADER_SZ)
ret = TPM_RC_SUCCESS;
}
#else
/* Send Entire Message - no wait states */
spi.tx_buf = (unsigned long)txBuf;
@ -292,7 +296,7 @@
#ifdef WOLFTPM_AUTODETECT
/* if response is not 0xFF then we "found" something */
if (!foundSpiDev) {
if (rxBuf[0] != 0xFF) {
if (ret == TPM_RC_SUCCESS && rxBuf[0] != 0xFF) {
#ifdef DEBUG_WOLFTPM
printf("Found TPM @ %s\n", TPM2_SPI_DEV);
#endif