6 files changed, 38 insertions, 25 deletions

diff --git a/drivers/ide/alim15x3.c b/drivers/ide/alim15x3.c
index e56c7b72f9e2..45d2356bb725 100644
--- a/drivers/ide/alim15x3.c
+++ b/drivers/ide/alim15x3.c
@@ -591,7 +591,7 @@ static int __init ali15x3_ide_init(void)
 
 static void __exit ali15x3_ide_exit(void)
 {
-        return pci_unregister_driver(&alim15x3_pci_driver);
+        pci_unregister_driver(&alim15x3_pci_driver);
 }
 
 module_init(ali15x3_ide_init);
diff --git a/drivers/ide/amd74xx.c b/drivers/ide/amd74xx.c
index 81ec73134eda..c6bcd3014a29 100644
--- a/drivers/ide/amd74xx.c
+++ b/drivers/ide/amd74xx.c
@@ -3,7 +3,7 @@
  * IDE driver for Linux.
  *
  * Copyright (c) 2000-2002 Vojtech Pavlik
- * Copyright (c) 2007 Bartlomiej Zolnierkiewicz
+ * Copyright (c) 2007-2008 Bartlomiej Zolnierkiewicz
  *
  * Based on the work of:
  *      Andre Hedrick
@@ -263,6 +263,15 @@ static int __devinit amd74xx_probe(struct pci_dev *dev, const struct pci_device_
                         d.udma_mask = ATA_UDMA5;
         }
 
+        /*
+         * It seems that on some nVidia controllers using AltStatus
+         * register can be unreliable so default to Status register
+         * if the device is in Compatibility Mode.
+         */
+        if (dev->vendor == PCI_VENDOR_ID_NVIDIA &&
+            ide_pci_is_in_compatibility_mode(dev))
+                d.host_flags |= IDE_HFLAG_BROKEN_ALTSTATUS;
+
         printk(KERN_INFO "%s %s: UDMA%s controller\n",
                 d.name, pci_name(dev), amd_dma[fls(d.udma_mask) - 1]);
 
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 7162d67562af..7d275b2af3eb 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -132,10 +132,14 @@ int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors)
 }
 EXPORT_SYMBOL(ide_end_request);
 
-static void ide_complete_power_step(ide_drive_t *drive, struct request *rq, u8 stat, u8 error)
+static void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
 {
         struct request_pm_state *pm = rq->data;
 
+#ifdef DEBUG_PM
+        printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
+                drive->name, pm->pm_step);
+#endif
         if (drive->media != ide_disk)
                 return;
 
@@ -172,7 +176,7 @@ static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *
                 /* Not supported? Switch to next step now. */
                 if (ata_id_flush_enabled(drive->id) == 0 ||
                     (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
-                        ide_complete_power_step(drive, rq, 0, 0);
+                        ide_complete_power_step(drive, rq);
                         return ide_stopped;
                 }
                 if (ata_id_flush_ext_enabled(drive->id))
@@ -191,7 +195,7 @@ static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *
                 if (drive->media != ide_disk)
                         pm->pm_step = IDE_PM_RESTORE_DMA;
                 else
-                        ide_complete_power_step(drive, rq, 0, 0);
+                        ide_complete_power_step(drive, rq);
                 return ide_stopped;
         case IDE_PM_IDLE:               /* Resume step 2 (idle) */
                 args->tf.command = ATA_CMD_IDLEIMMEDIATE;
@@ -204,10 +208,8 @@ static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *
                  */
                 if (drive->hwif->dma_ops == NULL)
                         break;
-                /*
-                 * TODO: respect IDE_DFLAG_USING_DMA
-                 */
-                ide_set_dma(drive);
+                if (drive->dev_flags & IDE_DFLAG_USING_DMA)
+                        ide_set_dma(drive);
                 break;
         }
 
@@ -322,11 +324,8 @@ void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err)
                 }
         } else if (blk_pm_request(rq)) {
                 struct request_pm_state *pm = rq->data;
-#ifdef DEBUG_PM
-                printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n",
-                        drive->name, rq->pm->pm_step, stat, err);
-#endif
-                ide_complete_power_step(drive, rq, stat, err);
+
+                ide_complete_power_step(drive, rq);
                 if (pm->pm_step == IDE_PM_COMPLETED)
                         ide_complete_pm_request(drive, rq);
                 return;
@@ -804,7 +803,7 @@ static ide_startstop_t start_request (ide_drive_t *drive, struct request *rq)
                         struct request_pm_state *pm = rq->data;
 #ifdef DEBUG_PM
                         printk("%s: start_power_step(step: %d)\n",
-                                drive->name, rq->pm->pm_step);
+                                drive->name, pm->pm_step);
 #endif
                         startstop = ide_start_power_step(drive, rq);
                         if (startstop == ide_stopped &&
@@ -967,14 +966,13 @@ static void ide_do_request (ide_hwgroup_t *hwgroup, int masked_irq)
         ide_startstop_t startstop;
         int             loops = 0;
 
-        /* for atari only: POSSIBLY BROKEN HERE(?) */
-        ide_get_lock(ide_intr, hwgroup);
-
         /* caller must own ide_lock */
         BUG_ON(!irqs_disabled());
 
         while (!hwgroup->busy) {
                 hwgroup->busy = 1;
+                /* for atari only */
+                ide_get_lock(ide_intr, hwgroup);
                 drive = choose_drive(hwgroup);
                 if (drive == NULL) {
                         int sleeping = 0;
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 5d6ba14e211d..c41c3b9b6f02 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -457,18 +457,14 @@ int drive_is_ready (ide_drive_t *drive)
         if (drive->waiting_for_dma)
                 return hwif->dma_ops->dma_test_irq(drive);
 
-#if 0
-        /* need to guarantee 400ns since last command was issued */
-        udelay(1);
-#endif
-
         /*
          * We do a passive status test under shared PCI interrupts on
          * cards that truly share the ATA side interrupt, but may also share
          * an interrupt with another pci card/device.  We make no assumptions
          * about possible isa-pnp and pci-pnp issues yet.
          */
-        if (hwif->io_ports.ctl_addr)
+        if (hwif->io_ports.ctl_addr &&
+            (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0)
                 stat = hwif->tp_ops->read_altstatus(hwif);
         else
                 /* Note: this may clear a pending IRQ!! */
@@ -610,6 +606,7 @@ static const struct drive_list_entry ivb_list[] = {
         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
         { "TSSTcorp CDDVDW SH-S202H"    , "SB00"        },
         { "TSSTcorp CDDVDW SH-S202H"    , "SB01"        },
+        { "SAMSUNG SP0822N"             , "WA100-10"    },
         { NULL                          , NULL          }
 };
 
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 1649ea54f76c..c55bdbd22314 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -266,7 +266,8 @@ static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
         /* take a deep breath */
         msleep(50);
 
-        if (io_ports->ctl_addr) {
+        if (io_ports->ctl_addr &&
+            (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
                 a = tp_ops->read_altstatus(hwif);
                 s = tp_ops->read_status(hwif);
                 if ((a ^ s) & ~ATA_IDX)
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 54525be4b5f8..010fb26a1579 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1296,6 +1296,13 @@ extern int __ide_pci_register_driver(struct pci_driver *driver, struct module *o
 #define ide_pci_register_driver(d) pci_register_driver(d)
 #endif
 
+static inline int ide_pci_is_in_compatibility_mode(struct pci_dev *dev)
+{
+        if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE && (dev->class & 5) != 5)
+                return 1;
+        return 0;
+}
+
 void ide_pci_setup_ports(struct pci_dev *, const struct ide_port_info *, int,
                          hw_regs_t *, hw_regs_t **);
 void ide_setup_pci_noise(struct pci_dev *, const struct ide_port_info *);
@@ -1375,6 +1382,7 @@ enum {
         IDE_HFLAG_IO_32BIT              = (1 << 24),
         /* unmask IRQs */
         IDE_HFLAG_UNMASK_IRQS           = (1 << 25),
+        IDE_HFLAG_BROKEN_ALTSTATUS      = (1 << 26),
         /* serialize ports if DMA is possible (for sl82c105) */
         IDE_HFLAG_SERIALIZE_DMA         = (1 << 27),
         /* force host out of "simplex" mode */