ide-timings: use ->pio_mode value to determine fastest PIO speed

Use the current PIO mode value instead of the physical maximum one
to determine the fastest allowed PIO for shared PIO/DMA timings.

Affected host drivers: amd74xx and via82cxxx.

[ Update comment to match -DaveM ]

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/ide/ide-timings.c b/drivers/ide/ide-timings.c
index c6053ab2b6c6..c7a65ee72310 100644
--- a/drivers/ide/ide-timings.c
+++ b/drivers/ide/ide-timings.c
@@ -186,11 +186,10 @@ int ide_timing_compute(ide_drive_t *drive, u8 speed,
         /*
          * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
          * S.M.A.R.T and some other commands. We have to ensure that the
-         * DMA cycle timing is slower/equal than the fastest PIO timing.
+         * DMA cycle timing is slower/equal than the current PIO timing.
          */
         if (speed >= XFER_SW_DMA_0) {
-                u8 pio = ide_get_best_pio_mode(drive, 255, 5);
-                ide_timing_compute(drive, XFER_PIO_0 + pio, &p, T, UT);
+                ide_timing_compute(drive, drive->pio_mode, &p, T, UT);
                 ide_timing_merge(&p, t, t, IDE_TIMING_ALL);
         }