diff options
Diffstat (limited to 'drivers/ptp/ptp_clockmatrix.c')
-rw-r--r-- | drivers/ptp/ptp_clockmatrix.c | 64 |
1 files changed, 62 insertions, 2 deletions
diff --git a/drivers/ptp/ptp_clockmatrix.c b/drivers/ptp/ptp_clockmatrix.c index 051511f5e1f2..9bfd32baad92 100644 --- a/drivers/ptp/ptp_clockmatrix.c +++ b/drivers/ptp/ptp_clockmatrix.c @@ -335,6 +335,67 @@ static int wait_for_boot_status_ready(struct idtcm *idtcm) return -EBUSY; } +static int read_sys_apll_status(struct idtcm *idtcm, u8 *status) +{ + return idtcm_read(idtcm, STATUS, DPLL_SYS_APLL_STATUS, status, + sizeof(u8)); +} + +static int read_sys_dpll_status(struct idtcm *idtcm, u8 *status) +{ + return idtcm_read(idtcm, STATUS, DPLL_SYS_STATUS, status, sizeof(u8)); +} + +static int wait_for_sys_apll_dpll_lock(struct idtcm *idtcm) +{ + unsigned long timeout = jiffies + msecs_to_jiffies(LOCK_TIMEOUT_MS); + u8 apll = 0; + u8 dpll = 0; + int err; + + do { + err = read_sys_apll_status(idtcm, &apll); + if (err) + return err; + + err = read_sys_dpll_status(idtcm, &dpll); + if (err) + return err; + + apll &= SYS_APLL_LOSS_LOCK_LIVE_MASK; + dpll &= DPLL_SYS_STATE_MASK; + + if (apll == SYS_APLL_LOSS_LOCK_LIVE_LOCKED && + dpll == DPLL_STATE_LOCKED) { + return 0; + } else if (dpll == DPLL_STATE_FREERUN || + dpll == DPLL_STATE_HOLDOVER || + dpll == DPLL_STATE_OPEN_LOOP) { + dev_warn(&idtcm->client->dev, + "No wait state: DPLL_SYS_STATE %d", dpll); + return -EPERM; + } + + msleep(LOCK_POLL_INTERVAL_MS); + } while (time_is_after_jiffies(timeout)); + + dev_warn(&idtcm->client->dev, + "%d ms lock timeout: SYS APLL Loss Lock %d SYS DPLL state %d", + LOCK_TIMEOUT_MS, apll, dpll); + + return -ETIME; +} + +static void wait_for_chip_ready(struct idtcm *idtcm) +{ + if (wait_for_boot_status_ready(idtcm)) + dev_warn(&idtcm->client->dev, "BOOT_STATUS != 0xA0"); + + if (wait_for_sys_apll_dpll_lock(idtcm)) + dev_warn(&idtcm->client->dev, + "Continuing while SYS APLL/DPLL is not locked"); +} + static int _idtcm_gettime(struct idtcm_channel *channel, struct timespec64 *ts) { @@ -2235,8 +2296,7 @@ static int idtcm_probe(struct i2c_client *client, dev_warn(&idtcm->client->dev, "loading firmware failed with %d\n", err); - if (wait_for_boot_status_ready(idtcm)) - dev_warn(&idtcm->client->dev, "BOOT_STATUS != 0xA0\n"); + wait_for_chip_ready(idtcm); if (idtcm->tod_mask) { for (i = 0; i < MAX_TOD; i++) { |