[PATCH] pata_amd: suspend/resume

Early AMD chips require FIFO and/or simplex flag clearing work on resume
from RAM. Most devices need no help

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 23 insertions, 2 deletions

diff --git a/drivers/ata/pata_amd.c b/drivers/ata/pata_amd.c
index 8be46a63af74..d9571206e580 100644
--- a/drivers/ata/pata_amd.c
+++ b/drivers/ata/pata_amd.c
@@ -25,7 +25,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME "pata_amd"
-#define DRV_VERSION "0.2.4"
+#define DRV_VERSION "0.2.7"
 
 /**
  *      timing_setup            -       shared timing computation and load
@@ -335,6 +335,8 @@ static struct scsi_host_template amd_sht = {
         .slave_configure        = ata_scsi_slave_config,
         .slave_destroy          = ata_scsi_slave_destroy,
         .bios_param             = ata_std_bios_param,
+        .resume                 = ata_scsi_device_resume,
+        .suspend                = ata_scsi_device_suspend,
 };
 
 static struct ata_port_operations amd33_port_ops = {
@@ -662,6 +664,23 @@ static int amd_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
         return ata_pci_init_one(pdev, port_info, 2);
 }
 
+static int amd_reinit_one(struct pci_dev *pdev)
+{
+        if (pdev->vendor == PCI_VENDOR_ID_AMD) {
+                u8 fifo;
+                pci_read_config_byte(pdev, 0x41, &fifo);
+                if (pdev->device == PCI_DEVICE_ID_AMD_VIPER_7411)
+                        /* FIFO is broken */
+                        pci_write_config_byte(pdev, 0x41, fifo & 0x0F);
+                else
+                        pci_write_config_byte(pdev, 0x41, fifo | 0xF0);
+                if (pdev->device == PCI_DEVICE_ID_AMD_VIPER_7409 ||
+                    pdev->device == PCI_DEVICE_ID_AMD_COBRA_7401)
+                        ata_pci_clear_simplex(pdev);
+        }
+        return ata_pci_device_resume(pdev);
+}
+
 static const struct pci_device_id amd[] = {
         { PCI_VDEVICE(AMD,      PCI_DEVICE_ID_AMD_COBRA_7401),          0 },
         { PCI_VDEVICE(AMD,      PCI_DEVICE_ID_AMD_VIPER_7409),          1 },
@@ -689,7 +708,9 @@ static struct pci_driver amd_pci_driver = {
         .name           = DRV_NAME,
         .id_table       = amd,
         .probe          = amd_init_one,
-        .remove         = ata_pci_remove_one
+        .remove         = ata_pci_remove_one,
+        .suspend        = ata_pci_device_suspend,
+        .resume         = amd_reinit_one,
 };
 
 static int __init amd_init(void)