dtc2278: fix ->io_32bit handling

On DTC2278 32-bit I/O has to be enabled for both devices on the port
so always enable it during init time and disallow further changes.

Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

2 files changed, 6 insertions, 10 deletions

diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index ab9ca2b5b66c..fb0c47c8819d 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -791,10 +791,6 @@ int set_io_32bit(ide_drive_t *drive, int arg)
                 return -EBUSY;
 
         drive->io_32bit = arg;
-#ifdef CONFIG_BLK_DEV_DTC2278
-        if (HWIF(drive)->chipset == ide_dtc2278)
-                HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
-#endif /* CONFIG_BLK_DEV_DTC2278 */
 
         spin_unlock_irq(&ide_lock);
 
diff --git a/drivers/ide/legacy/dtc2278.c b/drivers/ide/legacy/dtc2278.c
index 611c9705a3ae..092c04abbe7a 100644
--- a/drivers/ide/legacy/dtc2278.c
+++ b/drivers/ide/legacy/dtc2278.c
@@ -84,12 +84,6 @@ static void dtc2278_set_pio_mode(ide_drive_t *drive, const u8 pio)
                 /* Actually we do - there is a data sheet available for the
                    Winbond but does anyone actually care */
         }
-
-        /*
-         * 32bit I/O has to be enabled for *both* drives at the same time.
-         */
-        drive->io_32bit = 1;
-        HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
 }
 
 static int __init dtc2278_probe(void)
@@ -123,18 +117,24 @@ static int __init dtc2278_probe(void)
         local_irq_restore(flags);
 
         hwif->serialized = 1;
+        hwif->no_io_32bit = 1;  /* disallow ->io_32bit changes */
         hwif->chipset = ide_dtc2278;
         hwif->pio_mask = ATA_PIO4;
         hwif->set_pio_mode = &dtc2278_set_pio_mode;
         hwif->drives[0].no_unmask = 1;
         hwif->drives[1].no_unmask = 1;
+        hwif->drives[0].io_32bit = 1;
+        hwif->drives[1].io_32bit = 1;
         hwif->mate = mate;
 
         mate->serialized = 1;
+        mate->no_io_32bit = 1;
         mate->chipset = ide_dtc2278;
         mate->pio_mask = ATA_PIO4;
         mate->drives[0].no_unmask = 1;
         mate->drives[1].no_unmask = 1;
+        mate->drives[0].io_32bit = 1;
+        mate->drives[1].io_32bit = 1;
         mate->mate = hwif;
         mate->channel = 1;