1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/ata/sata_sis.c b/drivers/ata/sata_sis.c
index 9d1235ba06b1..9c25a1e91730 100644
--- a/drivers/ata/sata_sis.c
+++ b/drivers/ata/sata_sis.c
@@ -173,7 +173,7 @@ static u32 sis_scr_cfg_read (struct ata_port *ap, unsigned int sc_reg)
         if ((pdev->device == 0x182) || (pmr & SIS_PMR_COMBINED))
                 pci_read_config_dword(pdev, cfg_addr+0x10, &val2);
 
-        return val|val2;
+        return (val|val2) &  0xfffffffb; /* avoid problems with powerdowned ports */
 }
 
 static void sis_scr_cfg_write (struct ata_port *ap, unsigned int scr, u32 val)
@@ -212,7 +212,7 @@ static u32 sis_scr_read (struct ata_port *ap, unsigned int sc_reg)
         if ((pdev->device == 0x182) || (pmr & SIS_PMR_COMBINED))
                 val2 = inl(ap->ioaddr.scr_addr + (sc_reg * 4) + 0x10);
 
-        return val | val2;
+        return (val | val2) &  0xfffffffb;
 }
 
 static void sis_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
@@ -239,7 +239,7 @@ static int sis_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
         static int printed_version;
         struct ata_probe_ent *probe_ent = NULL;
         int rc;
-        u32 genctl;
+        u32 genctl, val;
         struct ata_port_info pi = sis_port_info, *ppi[2] = { &pi, &pi };
         int pci_dev_busy = 0;
         u8 pmr;
@@ -285,17 +285,24 @@ static int sis_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
         if (ent->device != 0x182) {
                 if ((pmr & SIS_PMR_COMBINED) == 0) {
                         dev_printk(KERN_INFO, &pdev->dev,
-                                   "Detected SiS 180/181 chipset in SATA mode\n");
+                                   "Detected SiS 180/181/964 chipset in SATA mode\n");
                         port2_start = 64;
                 }
                 else {
                         dev_printk(KERN_INFO, &pdev->dev,
                                    "Detected SiS 180/181 chipset in combined mode\n");
                         port2_start=0;
+                        pi.flags |= ATA_FLAG_SLAVE_POSS;
                 }
         }
         else {
-                dev_printk(KERN_INFO, &pdev->dev, "Detected SiS 182 chipset\n");
+                pci_read_config_dword ( pdev, 0x6C, &val);
+                if (val & (1L << 31)) {
+                        dev_printk(KERN_INFO, &pdev->dev, "Detected SiS 182/965 chipset\n");
+                        pi.flags |= ATA_FLAG_SLAVE_POSS;
+                }
+                else
+                        dev_printk(KERN_INFO, &pdev->dev, "Detected SiS 182/965L chipset\n");
                 port2_start = 0x20;
         }