ide: (hopefully) fix VDMA for CS5520

* Set the correct hwif->dma_base for the second channel in
  ide_get_or_set_dma_base().

* Remove DMA enable code from cs5520_set_pio_mode(), this can
  be handled by the generic ->dma_host_on method now.

* Add VDMA check to ide_config_drive_speed().

* drive->using_dma was never enabled since cs5520 host driver's
  ->ide_dma_on method overrided the generic ->ide_dma_on (so
  __ide_dma_on() was never called, drive->using_dma was never set
  and VDMA was never used since it depends on drive->using_dma).

  Fix it by using ->dma_host_on method instead of ->ide_dma_on
  (also add matching ->dma_host_off method).

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

3 files changed, 25 insertions, 16 deletions

diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index c97c0719ddf1..e3e5e39f4906 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -799,7 +799,7 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 
  skip:
 #ifdef CONFIG_BLK_DEV_IDEDMA
-        if (speed >= XFER_SW_DMA_0)
+        if (speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA))
                 hwif->dma_host_on(drive);
         else if (hwif->ide_dma_on)      /* check if host supports DMA */
                 hwif->dma_off_quietly(drive);
diff --git a/drivers/ide/pci/cs5520.c b/drivers/ide/pci/cs5520.c
index d1a91bcb5b29..78058ca2ce76 100644
--- a/drivers/ide/pci/cs5520.c
+++ b/drivers/ide/pci/cs5520.c
@@ -71,7 +71,6 @@ static void cs5520_set_pio_mode(ide_drive_t *drive, const u8 pio)
         ide_hwif_t *hwif = HWIF(drive);
         struct pci_dev *pdev = hwif->pci_dev;
         int controller = drive->dn > 1 ? 1 : 0;
-        u8 reg;
 
         /* FIXME: if DMA = 1 do we need to set the DMA bit here ? */
 
@@ -91,11 +90,6 @@ static void cs5520_set_pio_mode(ide_drive_t *drive, const u8 pio)
         pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1),
                 (cs5520_pio_clocks[pio].recovery << 4) |
                 (cs5520_pio_clocks[pio].assert));
-                
-        /* Set the DMA enable/disable flag */
-        reg = inb(hwif->dma_base + 0x02 + 8*controller);
-        reg |= 1<<((drive->dn&1)+5);
-        outb(reg, hwif->dma_base + 0x02 + 8*controller);
 }
 
 static void cs5520_set_dma_mode(ide_drive_t *drive, const u8 speed)
@@ -109,13 +103,23 @@ static void cs5520_set_dma_mode(ide_drive_t *drive, const u8 speed)
  *      We wrap the DMA activate to set the vdma flag. This is needed
  *      so that the IDE DMA layer issues PIO not DMA commands over the
  *      DMA channel
+ *
+ *      ATAPI is harder so disable it for now using IDE_HFLAG_NO_ATAPI_DMA
  */
- 
-static int cs5520_dma_on(ide_drive_t *drive)
+
+static void cs5520_dma_host_on(ide_drive_t *drive)
 {
-        /* ATAPI is harder so leave it for now */
-        drive->vdma = 1;
-        return 0;
+        if (drive->using_dma)
+                drive->vdma = 1;
+
+        ide_dma_host_on(drive);
+}
+
+static void cs5520_dma_host_off(ide_drive_t *drive)
+{
+        drive->vdma = 0;
+
+        ide_dma_host_off(drive);
 }
 
 static void __devinit init_hwif_cs5520(ide_hwif_t *hwif)
@@ -126,7 +130,8 @@ static void __devinit init_hwif_cs5520(ide_hwif_t *hwif)
         if (hwif->dma_base == 0)
                 return;
 
-        hwif->ide_dma_on = &cs5520_dma_on;
+        hwif->dma_host_on  = &cs5520_dma_host_on;
+        hwif->dma_host_off = &cs5520_dma_host_off;
 }
 
 #define DECLARE_CS_DEV(name_str)                                \
diff --git a/drivers/ide/setup-pci.c b/drivers/ide/setup-pci.c
index d2cd5a3d38f8..bbfdf7e0f182 100644
--- a/drivers/ide/setup-pci.c
+++ b/drivers/ide/setup-pci.c
@@ -165,13 +165,17 @@ static unsigned long ide_get_or_set_dma_base(const struct ide_port_info *d, ide_
 
                 dma_base = pci_resource_start(dev, baridx);
 
-                if (dma_base == 0)
+                if (dma_base == 0) {
                         printk(KERN_ERR "%s: DMA base is invalid\n", d->name);
+                        return 0;
+                }
         }
 
-        if ((d->host_flags & IDE_HFLAG_CS5520) == 0 && dma_base) {
+        if (hwif->channel)
+                dma_base += 8;
+
+        if ((d->host_flags & IDE_HFLAG_CS5520) == 0) {
                 u8 simplex_stat = 0;
-                dma_base += hwif->channel ? 8 : 0;
 
                 switch(dev->device) {
                         case PCI_DEVICE_ID_AL_M5219: