1 files changed, 12 insertions, 8 deletions

diff --git a/drivers/ide/pci/amd74xx.c b/drivers/ide/pci/amd74xx.c
index 9c3ea90aeb8b..5ed1d485fc7e 100644
--- a/drivers/ide/pci/amd74xx.c
+++ b/drivers/ide/pci/amd74xx.c
@@ -1,5 +1,5 @@
 /*
- * Version 2.20
+ * Version 2.21
  *
  * AMD 755/756/766/8111 and nVidia nForce/2/2s/3/3s/CK804/MCP04
  * IDE driver for Linux.
@@ -272,10 +272,8 @@ static int amd_set_drive(ide_drive_t *drive, u8 speed)
 
 static void amd74xx_tune_drive(ide_drive_t *drive, u8 pio)
 {
-        if (pio == 255) {
-                amd_set_drive(drive, ide_find_best_pio_mode(drive));
-                return;
-        }
+        if (pio == 255)
+                pio = ide_get_best_pio_mode(drive, 255, 5);
 
         amd_set_drive(drive, XFER_PIO_0 + min_t(byte, pio, 5));
 }
@@ -284,12 +282,14 @@ static int amd74xx_ide_dma_check(ide_drive_t *drive)
 {
         u8 speed = ide_max_dma_mode(drive);
 
-        if (speed == 0)
-                speed = ide_find_best_pio_mode(drive);
+        if (speed == 0) {
+                amd74xx_tune_drive(drive, 255);
+                return -1;
+        }
 
         amd_set_drive(drive, speed);
 
-        if (drive->autodma && (speed & XFER_MODE) != XFER_PIO)
+        if (drive->autodma)
                 return 0;
 
         return -1;
@@ -451,6 +451,8 @@ static void __devinit init_hwif_amd74xx(ide_hwif_t *hwif)
                 .autodma        = AUTODMA,                              \
                 .enablebits     = {{0x40,0x02,0x02}, {0x40,0x01,0x01}}, \
                 .bootable       = ON_BOARD,                             \
+                .host_flags     = IDE_HFLAG_PIO_NO_BLACKLIST            \
+                                | IDE_HFLAG_PIO_NO_DOWNGRADE,           \
         }
 
 #define DECLARE_NV_DEV(name_str)                                        \
@@ -461,6 +463,8 @@ static void __devinit init_hwif_amd74xx(ide_hwif_t *hwif)
                 .autodma        = AUTODMA,                              \
                 .enablebits     = {{0x50,0x02,0x02}, {0x50,0x01,0x01}}, \
                 .bootable       = ON_BOARD,                             \
+                .host_flags     = IDE_HFLAG_PIO_NO_BLACKLIST            \
+                                | IDE_HFLAG_PIO_NO_DOWNGRADE,           \
         }
 
 static ide_pci_device_t amd74xx_chipsets[] __devinitdata = {