mmc: sdhci-pci: add flag for devices that can support runtime PM

Only allow runtime PM for devices that specifically indicate
that they support it.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/sdhci-pci.c

@@ -47,6 +47,7 @@ struct sdhci_pci_slot;
 
 struct sdhci_pci_fixes {
 	unsigned int		quirks;
+	bool			allow_runtime_pm;
 
 	int			(*probe) (struct sdhci_pci_chip *);
 
@@ -72,6 +73,7 @@ struct sdhci_pci_chip {
 	struct pci_dev		*pdev;
 
 	unsigned int		quirks;
+	bool			allow_runtime_pm;
 	const struct sdhci_pci_fixes *fixes;
 
 	int			num_slots;	/* Slots on controller */
@@ -305,16 +307,19 @@ static const struct sdhci_pci_fixes sdhci_intel_mrst_hc1_hc2 = {
 
 static const struct sdhci_pci_fixes sdhci_intel_mfd_sd = {
 	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
+	.allow_runtime_pm = true,
 	.probe_slot	= mfd_sd_probe_slot,
 	.remove_slot	= mfd_sd_remove_slot,
 };
 
 static const struct sdhci_pci_fixes sdhci_intel_mfd_sdio = {
 	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
+	.allow_runtime_pm = true,
 };
 
 static const struct sdhci_pci_fixes sdhci_intel_mfd_emmc = {
 	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
+	.allow_runtime_pm = true,
 	.probe_slot	= mfd_emmc_probe_slot,
 	.remove_slot	= mfd_emmc_remove_slot,
 };
@@ -1355,8 +1360,10 @@ static int __devinit sdhci_pci_probe(struct pci_dev *pdev,
 
 	chip->pdev = pdev;
 	chip->fixes = (const struct sdhci_pci_fixes *)ent->driver_data;
-	if (chip->fixes)
+	if (chip->fixes) {
 		chip->quirks = chip->fixes->quirks;
+		chip->allow_runtime_pm = chip->fixes->allow_runtime_pm;
+	}
 	chip->num_slots = slots;
 
 	pci_set_drvdata(pdev, chip);
@@ -1381,7 +1388,8 @@ static int __devinit sdhci_pci_probe(struct pci_dev *pdev,
 		chip->slots[i] = slot;
 	}
 
-	sdhci_pci_runtime_pm_allow(&pdev->dev);
+	if (chip->allow_runtime_pm)
+		sdhci_pci_runtime_pm_allow(&pdev->dev);
 
 	return 0;
 
@@ -1399,11 +1407,12 @@ static void __devexit sdhci_pci_remove(struct pci_dev *pdev)
 	int i;
 	struct sdhci_pci_chip *chip;
 
-	sdhci_pci_runtime_pm_forbid(&pdev->dev);
-
 	chip = pci_get_drvdata(pdev);
 
 	if (chip) {
+		if (chip->allow_runtime_pm)
+			sdhci_pci_runtime_pm_forbid(&pdev->dev);
+
 		for (i = 0; i < chip->num_slots; i++)
 			sdhci_pci_remove_slot(chip->slots[i]);