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feat(core): Improve Optiga transport error handling.

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This commit is contained in:
Andrew Kozlik 2023-09-21 11:06:17 +02:00 committed by Andrew Kozlik
parent 7d92e70cc3
commit b3d0fb68ff
1 changed files with 15 additions and 5 deletions
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20
core/embed/trezorhal/optiga/optiga_transport.c
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@ -281,20 +281,23 @@ static optiga_result optiga_ensure_ready(void) {
return ret;
}
if ((frame_buffer[0] & I2C_STATE_BYTE1_BUSY) == 0) {
if ((frame_buffer[0] & I2C_STATE_BYTE1_RESP_RDY) != 0) {
// There is a response that needs to be flushed out.
break;
}
if ((frame_buffer[0] & I2C_STATE_BYTE1_BUSY) == 0) {
// Not busy and no response that would need to be flushed out.
return OPTIGA_SUCCESS;
}
ret = OPTIGA_ERR_BUSY;
}
if (ret != OPTIGA_SUCCESS) {
// Optiga is busy even after maximum retries at reading the I2C state.
return ret;
}
if ((frame_buffer[0] & I2C_STATE_BYTE1_RESP_RDY) == 0) {
return OPTIGA_SUCCESS;
}
// Flush out the previous response.
uint16_t size = (frame_buffer[2] << 8) + frame_buffer[3];
@ -404,6 +407,13 @@ static optiga_result optiga_read(void) {
return OPTIGA_SUCCESS;
}
if ((frame_buffer[0] & I2C_STATE_BYTE1_BUSY) == 0) {
// Optiga has no response ready and is not busy. This shouldn't happen if
// we are expecting to read a response, but Optiga occasionally fails to
// give any response to a command.
return OPTIGA_ERR_UNEXPECTED;
}
}
return OPTIGA_ERR_TIMEOUT;