1 files changed, 12 insertions, 8 deletions

diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index a1d24cd1293e..313194a0f36e 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -535,7 +535,7 @@ pmac_outbsync(ide_drive_t *drive, u8 value, unsigned long port)
 static void
 pmac_ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
-        u32 *timings;
+        u32 *timings, t;
         unsigned accessTicks, recTicks;
         unsigned accessTime, recTime;
         pmac_ide_hwif_t* pmif = (pmac_ide_hwif_t *)HWIF(drive)->hwif_data;
@@ -546,6 +546,7 @@ pmac_ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
                 
         /* which drive is it ? */
         timings = &pmif->timings[drive->select.b.unit & 0x01];
+        t = *timings;
 
         cycle_time = ide_pio_cycle_time(drive, pio);
 
@@ -553,14 +554,14 @@ pmac_ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
         case controller_sh_ata6: {
                 /* 133Mhz cell */
                 u32 tr = kauai_lookup_timing(shasta_pio_timings, cycle_time);
-                *timings = ((*timings) & ~TR_133_PIOREG_PIO_MASK) | tr;
+                t = (t & ~TR_133_PIOREG_PIO_MASK) | tr;
                 break;
                 }
         case controller_un_ata6:
         case controller_k2_ata6: {
                 /* 100Mhz cell */
                 u32 tr = kauai_lookup_timing(kauai_pio_timings, cycle_time);
-                *timings = ((*timings) & ~TR_100_PIOREG_PIO_MASK) | tr;
+                t = (t & ~TR_100_PIOREG_PIO_MASK) | tr;
                 break;
                 }
         case controller_kl_ata4:
@@ -574,9 +575,9 @@ pmac_ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
                 accessTicks = min(accessTicks, 0x1fU);
                 recTicks = SYSCLK_TICKS_66(recTime);
                 recTicks = min(recTicks, 0x1fU);
-                *timings = ((*timings) & ~TR_66_PIO_MASK) |
-                                (accessTicks << TR_66_PIO_ACCESS_SHIFT) |
-                                (recTicks << TR_66_PIO_RECOVERY_SHIFT);
+                t = (t & ~TR_66_PIO_MASK) |
+                        (accessTicks << TR_66_PIO_ACCESS_SHIFT) |
+                        (recTicks << TR_66_PIO_RECOVERY_SHIFT);
                 break;
         default: {
                 /* 33Mhz cell */
@@ -596,11 +597,11 @@ pmac_ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
                         recTicks--; /* guess, but it's only for PIO0, so... */
                         ebit = 1;
                 }
-                *timings = ((*timings) & ~TR_33_PIO_MASK) |
+                t = (t & ~TR_33_PIO_MASK) |
                                 (accessTicks << TR_33_PIO_ACCESS_SHIFT) |
                                 (recTicks << TR_33_PIO_RECOVERY_SHIFT);
                 if (ebit)
-                        *timings |= TR_33_PIO_E;
+                        t |= TR_33_PIO_E;
                 break;
                 }
         }
@@ -613,6 +614,7 @@ pmac_ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
         if (ide_config_drive_speed(drive, XFER_PIO_0 + pio))
                 return;
 
+        *timings = t;
         pmac_ide_do_update_timings(drive);
 }
 
@@ -1143,6 +1145,8 @@ pmac_ide_setup_device(pmac_ide_hwif_t *pmif, ide_hwif_t *hwif)
         hwif->cbl = pmif->cable_80 ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
         hwif->drives[0].unmask = 1;
         hwif->drives[1].unmask = 1;
+        hwif->drives[0].autotune = IDE_TUNE_AUTO;
+        hwif->drives[1].autotune = IDE_TUNE_AUTO;
         hwif->host_flags = IDE_HFLAG_SET_PIO_MODE_KEEP_DMA;
         hwif->pio_mask = ATA_PIO4;
         hwif->set_pio_mode = pmac_ide_set_pio_mode;