amd74xx: use ->pio_mode value to determine pair device speed

Use the current PIO mode value instead of the current transfer speed
of the pair device on the port to determine PIO commmand timings used
for both devices on the port.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/ide/amd74xx.c b/drivers/ide/amd74xx.c
index b7e1053..3747b25 100644
--- a/drivers/ide/amd74xx.c
+++ b/drivers/ide/amd74xx.c
@@ -94,7 +94,7 @@
 	ide_timing_compute(drive, speed, &t, T, UT);
 
 	if (peer) {
-		ide_timing_compute(peer, peer->current_speed, &p, T, UT);
+		ide_timing_compute(peer, peer->pio_mode, &p, T, UT);
 		ide_timing_merge(&p, &t, &t, IDE_TIMING_8BIT);
 	}