static int ssi_start_pio()

in controllers/omap_ssi_port.c [286:318]

• 28 lines of code
• 4 McCabe index (conditional complexity)

static int ssi_start_pio(struct hsi_msg *msg)
{
	struct hsi_port *port = hsi_get_port(msg->cl);
	struct omap_ssi_port *omap_port = hsi_port_drvdata(port);
	struct hsi_controller *ssi = to_hsi_controller(port->device.parent);
	struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi);
	u32 val;

	pm_runtime_get(omap_port->pdev);

	if (!pm_runtime_active(omap_port->pdev)) {
		dev_warn(&port->device, "ssi_start_pio called without runtime PM!\n");
		pm_runtime_put_autosuspend(omap_port->pdev);
		return -EREMOTEIO;
	}

	if (msg->ttype == HSI_MSG_WRITE) {
		val = SSI_DATAACCEPT(msg->channel);
		/* Hold clocks for pio writes */
		pm_runtime_get(omap_port->pdev);
	} else {
		val = SSI_DATAAVAILABLE(msg->channel) | SSI_ERROROCCURED;
	}
	dev_dbg(&port->device, "Single %s transfer\n",
						msg->ttype ? "write" : "read");
	val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
	writel(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0));
	pm_runtime_put_autosuspend(omap_port->pdev);
	msg->actual_len = 0;
	msg->status = HSI_STATUS_PROCEEDING;

	return 0;
}