> +static int psp_send_i2c_req_mendocino(enum psp_i2c_req_type i2c_req_type) > +{ > + int status, ret; > + > + ret = read_poll_timeout(psp_ring_platform_doorbell, status, > + (status != -EBUSY), > + PSP_I2C_REQ_RETRY_DELAY_US, > + PSP_I2C_REQ_RETRY_CNT * PSP_I2C_REQ_RETRY_DELAY_US, > + 0, i2c_req_type); > + if (ret) > + dev_err(psp_i2c_dev, "Timed out waiting for PSP to %s I2C bus\n", > + (i2c_req_type == PSP_I2C_REQ_ACQUIRE) ? > + "release" : "acquire"); > + > + return ret ? ret : status; > +} I think we need the value of the PSP_CMDRESP_STS field returned to the caller and its status checked like in psp_send_i2c_req_cezanne. Otherwise the function won't continue to poll when the PSP_I2C_REQ_STS_BUS_BUSY bit is set. FYI - there's a test on ChromeOS to stress test I2C bus arbitration: https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform/tast-tests/src/chromiumos/tast/local/bundles/cros/hwsec/tpm_contest.go I can try to run it assuming the ToT kernel runs on skyrim.