3 files changed, 23 insertions, 0 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 71e15b73513..60707814a84 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1115,6 +1115,17 @@ static bool ahci_broken_online(struct pci_dev *pdev)
 	return pdev->bus->number == (val >> 8) && pdev->devfn == (val & 0xff);
 }
 
+static bool ahci_broken_devslp(struct pci_dev *pdev)
+{
+	/* device with broken DEVSLP but still showing SDS capability */
+	static const struct pci_device_id ids[] = {
+		{ PCI_VDEVICE(INTEL, 0x0f23)}, /* Valleyview SoC */
+		{}
+	};
+
+	return pci_match_id(ids, pdev);
+}
+
 #ifdef CONFIG_ATA_ACPI
 static void ahci_gtf_filter_workaround(struct ata_host *host)
 {
@@ -1364,6 +1375,10 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	hpriv->mmio = pcim_iomap_table(pdev)[ahci_pci_bar];
 
+	/* must set flag prior to save config in order to take effect */
+	if (ahci_broken_devslp(pdev))
+		hpriv->flags |= AHCI_HFLAG_NO_DEVSLP;
+
 	/* save initial config */
 	ahci_pci_save_initial_config(pdev, hpriv);
 
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index b5eb886da22..af63c75c200 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -236,6 +236,7 @@ enum {
 						        port start (wait until
 						        error-handling stage) */
 	AHCI_HFLAG_MULTI_MSI		= (1 << 16), /* multiple PCI MSIs */
+	AHCI_HFLAG_NO_DEVSLP		= (1 << 17), /* no device sleep */
 
 	/* ap->flags bits */
 
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 6bd4f660b4e..b9861453fc8 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -452,6 +452,13 @@ void ahci_save_initial_config(struct device *dev,
 		cap &= ~HOST_CAP_SNTF;
 	}
 
+	if ((cap2 & HOST_CAP2_SDS) && (hpriv->flags & AHCI_HFLAG_NO_DEVSLP)) {
+		dev_info(dev,
+			 "controller can't do DEVSLP, turning off\n");
+		cap2 &= ~HOST_CAP2_SDS;
+		cap2 &= ~HOST_CAP2_SADM;
+	}
+
 	if (!(cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_YES_FBS)) {
 		dev_info(dev, "controller can do FBS, turning on CAP_FBS\n");
 		cap |= HOST_CAP_FBS;