mmc: sdhci-pxav3: add IRQ wake up support

[cjb: The MMP3 architecture requires a registered interrupt to retire wfi
when waking from suspend.]

Signed-off-by: Jialing Fu <jlfu@marvell.com>
Signed-off-by: Kevin Liu <kliu5@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
index b7ee776..3d20c10 100644
--- a/drivers/mmc/host/sdhci-pxav3.c
+++ b/drivers/mmc/host/sdhci-pxav3.c
@@ -311,6 +311,13 @@
 
 	platform_set_drvdata(pdev, host);
 
+	if (pdata->pm_caps & MMC_PM_KEEP_POWER) {
+		device_init_wakeup(&pdev->dev, 1);
+		host->mmc->pm_flags |= MMC_PM_WAKE_SDIO_IRQ;
+	} else {
+		device_init_wakeup(&pdev->dev, 0);
+	}
+
 	return 0;
 
 err_add_host: