ahci_xgene: Implement the workaround to fix the missing of the edge interrupt...

	return rc;

}

/**

 * xgene_ahci_handle_broken_edge_irq - Handle the broken irq.

 * @ata_host: Host that recieved the irq

 * @irq_masked: HOST_IRQ_STAT value

 *

 * For hardware with broken edge trigger latch

 * the HOST_IRQ_STAT register misses the edge interrupt

 * when clearing of HOST_IRQ_STAT register and hardware

 * reporting the PORT_IRQ_STAT register at the

 * same clock cycle.

 * As such, the algorithm below outlines the workaround.

 *

 * 1. Read HOST_IRQ_STAT register and save the state.

 * 2. Clear the HOST_IRQ_STAT register.

 * 3. Read back the HOST_IRQ_STAT register.

 * 4. If HOST_IRQ_STAT register equals to zero, then

 *    traverse the rest of port's PORT_IRQ_STAT register

 *    to check if an interrupt is triggered at that point else

 *    go to step 6.

 * 5. If PORT_IRQ_STAT register of rest ports is not equal to zero

 *    then update the state of HOST_IRQ_STAT saved in step 1.

 * 6. Handle port interrupts.

 * 7. Exit

 */

static int xgene_ahci_handle_broken_edge_irq(struct ata_host *host,

					     u32 irq_masked)

{

	struct ahci_host_priv *hpriv = host->private_data;

	void __iomem *port_mmio;

	int i;

	if (!readl(hpriv->mmio + HOST_IRQ_STAT)) {

		for (i = 0; i < host->n_ports; i++) {

			if (irq_masked & (1 << i))

				continue;

			port_mmio = ahci_port_base(host->ports[i]);

			if (readl(port_mmio + PORT_IRQ_STAT))

				irq_masked |= (1 << i);

		}

	}

	return ahci_handle_port_intr(host, irq_masked);

}

static irqreturn_t xgene_ahci_irq_intr(int irq, void *dev_instance)

{

	struct ata_host *host = dev_instance;

	 */

	writel(irq_stat, mmio + HOST_IRQ_STAT);

	rc = ahci_handle_port_intr(host, irq_masked);

	rc = xgene_ahci_handle_broken_edge_irq(host, irq_masked);

	spin_unlock(&host->lock);