cs5530/sc1200: DMA support cleanup

sc1200.c:

* remove open-coded variant of ide_dma_host_off() (== ->dma_host_off),
  it is not needed because ->dma_off_quietly calls ->dma_host_off

* use ->dma_host_on (== ide_dma_host_on() for this driver) instead of
  open-coded variant, call it from the users of sc1200_config_dma2()

  [ there is no need to call ->dma_host_on in sc1200_config_dma() because
    core code takes care of calling ->ide_dma_on on successful execution
    of ->ide_dma_check ]

* add comment about ->tuneproc interface abuse

cs5530.c/sc1200.c:

* core code takes care of calling ->dma_off_quietly before calling
  ->ide_dma_check so there is no need to call it in ->ide_dma_check methods

* bump driver version

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 12 insertions, 15 deletions

diff --git a/drivers/ide/pci/sc1200.c b/drivers/ide/pci/sc1200.c
index c0254b5e7d92..65dcabe48205 100644
--- a/drivers/ide/pci/sc1200.c
+++ b/drivers/ide/pci/sc1200.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/ide/pci/sc1200.c               Version 0.92    Mar 10 2007
+ * linux/drivers/ide/pci/sc1200.c               Version 0.93    Mar 10 2007
  *
  * Copyright (C) 2000-2002              Mark Lord <mlord@pobox.com>
  * Copyright (C)      2007              Bartlomiej Zolnierkiewicz
@@ -137,12 +137,6 @@ static int sc1200_config_dma2 (ide_drive_t *drive, int mode)
         unsigned int            basereg = hwif->channel ? 0x50 : 0x40;
 
         /*
-         * Default to DMA-off in case we run into trouble here.
-         */
-        hwif->dma_off_quietly(drive);   /* turn off DMA while we fiddle */
-        outb(inb(hwif->dma_base+2)&~(unit?0x40:0x20), hwif->dma_base+2); /* clear DMA_capable bit */
-
-        /*
          * Tell the drive to switch to the new mode; abort on failure.
          */
         if (!mode || sc1200_set_xfer_mode(drive, mode)) {
@@ -217,8 +211,6 @@ static int sc1200_config_dma2 (ide_drive_t *drive, int mode)
                 pci_write_config_dword(hwif->pci_dev, basereg+12, timings);
         }
 
-        outb(inb(hwif->dma_base+2)|(unit?0x40:0x20), hwif->dma_base+2); /* set DMA_capable bit */
-
         return 0;       /* success */
 }
 
@@ -277,6 +269,9 @@ static void sc1200_tuneproc (ide_drive_t *drive, byte pio)	/* mode=255 means "au
         static byte     modes[5] = {XFER_PIO_0, XFER_PIO_1, XFER_PIO_2, XFER_PIO_3, XFER_PIO_4};
         int             mode = -1;
 
+        /*
+         * bad abuse of ->tuneproc interface
+         */
         switch (pio) {
                 case 200: mode = XFER_UDMA_0;   break;
                 case 201: mode = XFER_UDMA_1;   break;
@@ -287,7 +282,9 @@ static void sc1200_tuneproc (ide_drive_t *drive, byte pio)	/* mode=255 means "au
         }
         if (mode != -1) {
                 printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
-                (void)sc1200_config_dma2(drive, mode);
+                hwif->dma_off_quietly(drive);
+                if (sc1200_config_dma2(drive, mode) == 0)
+                        hwif->dma_host_on(drive);
                 return;
         }
 
@@ -421,12 +418,12 @@ static int sc1200_resume (struct pci_dev *dev)
                 for (d = 0; d < MAX_DRIVES; ++d) {
                         ide_drive_t *drive = &(hwif->drives[d]);
                         if (drive->present && !__ide_dma_bad_drive(drive)) {
-                                int was_using_dma = drive->using_dma;
+                                int enable_dma = drive->using_dma;
                                 hwif->dma_off_quietly(drive);
-                                sc1200_config_dma(drive);
-                                if (!was_using_dma && drive->using_dma) {
-                                        hwif->dma_off_quietly(drive);
-                                }
+                                if (sc1200_config_dma(drive))
+                                        enable_dma = 0;
+                                if (enable_dma)
+                                        hwif->dma_host_on(drive);
                         }
                 }
         }