diff options
Diffstat (limited to 'hw/p8-i2c.c')
| -rw-r--r-- | hw/p8-i2c.c | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/hw/p8-i2c.c b/hw/p8-i2c.c index 12a4d1a..faaf6ed 100644 --- a/hw/p8-i2c.c +++ b/hw/p8-i2c.c @@ -870,7 +870,7 @@ static int p8_i2c_start_request(struct p8_i2c_master *master, struct p8_i2c_master_port *port; struct p8_i2c_request *request = container_of(req, struct p8_i2c_request, req); - uint64_t cmd, now; + uint64_t cmd, now, poll_interval; int64_t rc, tbytes; DBG("Starting req %d len=%d addr=%02x (offset=%x)\n", @@ -975,7 +975,11 @@ static int p8_i2c_start_request(struct p8_i2c_master *master, /* Run a poll timer for boot cases or non-working interrupts * cases */ - now = schedule_timer(&master->poller, master->poll_interval); + if (!opal_booting() && master->irq_ok) + poll_interval = TIMER_POLL; + else + poll_interval = master->poll_interval; + now = schedule_timer(&master->poller, poll_interval); /* Calculate and start timeout */ if (request->timeout) { @@ -1428,15 +1432,14 @@ static void p8_i2c_init_one(struct dt_node *i2cm, enum p8_i2c_master_type type) port++; } - /* If we have no interrupt, calculate a poll interval, - * otherwise just use a TIMER_POLL timer which will tick - * on OPAL pollers only (which allows us to operate - * during boot before interrupts are functional etc... + /* When at runtime and we have the i2c irq, we just use it + * (see p8_i2c_start_request), but in the situation where + * one of those isn't the case (e.g. during boot), we need + * a better poll interval to efficiently crank the i2c machine. + * poll_interval is that interval. */ - if (master->irq_ok) - master->poll_interval = TIMER_POLL; - else - master->poll_interval = p8_i2c_get_poll_interval(max_bus_speed); + master->poll_interval = (max_bus_speed) ? p8_i2c_get_poll_interval(max_bus_speed) : TIMER_POLL; + master->byte_timeout = master->irq_ok ? msecs_to_tb(I2C_TIMEOUT_IRQ_MS) : msecs_to_tb(I2C_TIMEOUT_POLL_MS); |