static irqreturn_t ssi_wake_thread()

in controllers/omap_ssi_port.c [996:1033]

• 29 lines of code
• 6 McCabe index (conditional complexity)

static irqreturn_t ssi_wake_thread(int irq __maybe_unused, void *ssi_port)
{
	struct hsi_port *port = (struct hsi_port *)ssi_port;
	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);

	if (ssi_wakein(port)) {
		/**
		 * We can have a quick High-Low-High transition in the line.
		 * In such a case if we have long interrupt latencies,
		 * we can miss the low event or get twice a high event.
		 * This workaround will avoid breaking the clock reference
		 * count when such a situation ocurrs.
		 */
		if (!test_and_set_bit(SSI_WAKE_EN, &omap_port->flags))
			pm_runtime_get_sync(omap_port->pdev);
		dev_dbg(&ssi->device, "Wake in high\n");
		if (omap_port->wktest) { /* FIXME: HACK ! To be removed */
			writel(SSI_WAKE(0),
				omap_ssi->sys + SSI_SET_WAKE_REG(port->num));
		}
		hsi_event(port, HSI_EVENT_START_RX);
	} else {
		dev_dbg(&ssi->device, "Wake in low\n");
		if (omap_port->wktest) { /* FIXME: HACK ! To be removed */
			writel(SSI_WAKE(0),
				omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num));
		}
		hsi_event(port, HSI_EVENT_STOP_RX);
		if (test_and_clear_bit(SSI_WAKE_EN, &omap_port->flags)) {
			pm_runtime_mark_last_busy(omap_port->pdev);
			pm_runtime_put_autosuspend(omap_port->pdev);
		}
	}

	return IRQ_HANDLED;
}