mmc: host: Wait for Vdd to settle on card power off

The SD spec version 6.0 section 6.4.1.5 requires that Vdd must be
lowered to less than 0.5V for a minimum of 1 ms when powering off a
card. Increase our wait to 15 ms so that voltage has time to drain down
to 0.5V and cards can power off correctly.

Signed-off-by: Erick Shepherd <[email protected]>

Author: erickshepherdNI

drivers/mmc/host/sdhci-pci-core.c

@@ -608,8 +608,12 @@ static void sdhci_intel_set_power(struct sdhci_host *host, unsigned char mode,
 
 	sdhci_set_power(host, mode, vdd);
 
-	if (mode == MMC_POWER_OFF)
+	if (mode == MMC_POWER_OFF) {
+		if (slot->chip->pdev->device == PCI_DEVICE_ID_INTEL_APL_SD ||
+		    slot->chip->pdev->device == PCI_DEVICE_ID_INTEL_BYT_SD)
+			usleep_range(15000, 17500);
 		return;
+	}
 
 	/*
 	 * Bus power might not enable after D3 -> D0 transition due to the