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platform/chrome: cros-ec: Record event timestamp in the hard irq

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To improve sensor timestamp precision, given EC and AP are in different
time domains, the AP needs to try to record the exact moment an event
was signalled to the AP by the EC as soon as possible after it happens.

First thing in the hard irq is the best place for this.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@kernel.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Gwendal Grignou
2019-11-19 13:45:46 +01:00
committed by Enric Balletbo i Serra
parent d60ac88a62
commit 05a3c420ea
4 changed files with 47 additions and 5 deletions
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17
drivers/platform/chrome/cros_ec.c
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@@ -31,6 +31,15 @@ static struct cros_ec_platform pd_p = {
.cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_PD_INDEX),
};
static irqreturn_t ec_irq_handler(int irq, void *data)
{
struct cros_ec_device *ec_dev = data;
ec_dev->last_event_time = cros_ec_get_time_ns();
return IRQ_WAKE_THREAD;
}
static irqreturn_t ec_irq_thread(int irq, void *data)
{
struct cros_ec_device *ec_dev = data;
@@ -141,9 +150,11 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
}
if (ec_dev->irq) {
err = devm_request_threaded_irq(dev, ec_dev->irq, NULL,
ec_irq_thread, IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"chromeos-ec", ec_dev);
err = devm_request_threaded_irq(dev, ec_dev->irq,
ec_irq_handler,
ec_irq_thread,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"chromeos-ec", ec_dev);
if (err) {
dev_err(dev, "Failed to request IRQ %d: %d",
ec_dev->irq, err);