2 files changed, 113 insertions, 2 deletions

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index d9fa329fd157..ad070861bb53 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -91,6 +91,7 @@
 #include <linux/device.h>
 #include <scsi/scsi_host.h>
 #include <linux/libata.h>
+#include <linux/dmi.h>
 
 #define DRV_NAME        "ata_piix"
 #define DRV_VERSION     "2.11"
@@ -140,6 +141,9 @@ enum {
         RV                      = -3, /* reserved */
 
         PIIX_AHCI_DEVICE        = 6,
+
+        /* host->flags bits */
+        PIIX_HOST_BROKEN_SUSPEND = (1 << 24),
 };
 
 struct piix_map_db {
@@ -159,6 +163,10 @@ static void piix_set_piomode (struct ata_port *ap, struct ata_device *adev);
 static void piix_set_dmamode (struct ata_port *ap, struct ata_device *adev);
 static void ich_set_dmamode (struct ata_port *ap, struct ata_device *adev);
 static int ich_pata_cable_detect(struct ata_port *ap);
+#ifdef CONFIG_PM
+static int piix_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
+static int piix_pci_device_resume(struct pci_dev *pdev);
+#endif
 
 static unsigned int in_module_init = 1;
 
@@ -255,8 +263,8 @@ static struct pci_driver piix_pci_driver = {
         .probe                  = piix_init_one,
         .remove                 = ata_pci_remove_one,
 #ifdef CONFIG_PM
-        .suspend                = ata_pci_device_suspend,
-        .resume                 = ata_pci_device_resume,
+        .suspend                = piix_pci_device_suspend,
+        .resume                 = piix_pci_device_resume,
 #endif
 };
 
@@ -881,6 +889,107 @@ static void ich_set_dmamode (struct ata_port *ap, struct ata_device *adev)
         do_pata_set_dmamode(ap, adev, 1);
 }
 
+#ifdef CONFIG_PM
+static struct dmi_system_id piix_broken_suspend_dmi_table[] = {
+        {
+                .ident = "TECRA M5",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "TECRA M5"),
+                },
+        },
+        {
+                .ident = "Satellite U200",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Satellite U200"),
+                },
+        },
+        {
+                .ident = "Satellite U205",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Satellite U205"),
+                },
+        },
+        {
+                .ident = "Portege M500",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE M500"),
+                },
+        },
+        { }
+};
+
+static int piix_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
+{
+        struct ata_host *host = dev_get_drvdata(&pdev->dev);
+        unsigned long flags;
+        int rc = 0;
+
+        rc = ata_host_suspend(host, mesg);
+        if (rc)
+                return rc;
+
+        /* Some braindamaged ACPI suspend implementations expect the
+         * controller to be awake on entry; otherwise, it burns cpu
+         * cycles and power trying to do something to the sleeping
+         * beauty.
+         */
+        if (dmi_check_system(piix_broken_suspend_dmi_table) &&
+            mesg.event == PM_EVENT_SUSPEND) {
+                pci_save_state(pdev);
+
+                /* mark its power state as "unknown", since we don't
+                 * know if e.g. the BIOS will change its device state
+                 * when we suspend.
+                 */
+                if (pdev->current_state == PCI_D0)
+                        pdev->current_state = PCI_UNKNOWN;
+
+                /* tell resume that it's waking up from broken suspend */
+                spin_lock_irqsave(&host->lock, flags);
+                host->flags |= PIIX_HOST_BROKEN_SUSPEND;
+                spin_unlock_irqrestore(&host->lock, flags);
+        } else
+                ata_pci_device_do_suspend(pdev, mesg);
+
+        return 0;
+}
+
+static int piix_pci_device_resume(struct pci_dev *pdev)
+{
+        struct ata_host *host = dev_get_drvdata(&pdev->dev);
+        unsigned long flags;
+        int rc;
+
+        if (host->flags & PIIX_HOST_BROKEN_SUSPEND) {
+                spin_lock_irqsave(&host->lock, flags);
+                host->flags &= ~PIIX_HOST_BROKEN_SUSPEND;
+                spin_unlock_irqrestore(&host->lock, flags);
+
+                pci_set_power_state(pdev, PCI_D0);
+                pci_restore_state(pdev);
+
+                /* PCI device wasn't disabled during suspend.  Use
+                 * __pci_reenable_device() to avoid affecting the
+                 * enable count.
+                 */
+                rc = __pci_reenable_device(pdev);
+                if (rc)
+                        dev_printk(KERN_ERR, &pdev->dev, "failed to enable "
+                                   "device after resume (%d)\n", rc);
+        } else
+                rc = ata_pci_device_do_resume(pdev);
+
+        if (rc == 0)
+                ata_host_resume(host);
+
+        return rc;
+}
+#endif
+
 #define AHCI_PCI_BAR 5
 #define AHCI_GLOBAL_CTL 0x04
 #define AHCI_ENABLE (1 << 31)
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 9aa6c10f7bb1..41978a557318 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -216,6 +216,8 @@ enum {
         ATA_HOST_SIMPLEX        = (1 << 0),     /* Host is simplex, one DMA channel per host only */
         ATA_HOST_STARTED        = (1 << 1),     /* Host started */
 
+        /* bits 24:31 of host->flags are reserved for LLD specific flags */
+
         /* various lengths of time */
         ATA_TMOUT_BOOT          = 30 * HZ,      /* heuristic */
         ATA_TMOUT_BOOT_QUICK    = 7 * HZ,       /* heuristic */