Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7569e8dc2213ecc47024ea5edbadc8736487d926
Commit:     7569e8dc2213ecc47024ea5edbadc8736487d926
Parent:     056a697b7388844a1341e92e277bff8e5bf61ec9
Author:     Bartlomiej Zolnierkiewicz <[EMAIL PROTECTED]>
AuthorDate: Sat Feb 17 02:40:25 2007 +0100
Committer:  Bartlomiej Zolnierkiewicz <[EMAIL PROTECTED]>
CommitDate: Sat Feb 17 02:40:25 2007 +0100

    ide: add ide_use_fast_pio() helper (v3)
    
    * add ide_use_fast_pio() helper for use by host drivers
    
    * add DMA capability and hwif->autodma checks to ide_use_dma()
    
      - au1xxx-ide/it8213/it821x drivers didn't check for (id->capability & 1)
    
        [ for the IT8211/2 in SMART mode this check shouldn't be made but since
          in it821x_fixups() we set DMA bit explicitly:
    
                   if(strstr(id->model, "Integrated Technology Express")) {
                           /* In raid mode the ident block is slightly buggy
                              We need to set the bits so that the IDE layer 
knows
                              LBA28. LBA48 and DMA ar valid */
                           id->capability |= 3;            /* LBA28, DMA */
    
           we are better off using generic helper if we can ]
    
      - ide-cris driver didn't set ->autodma
    
        [ before the patch hwif->autodma was only checked in the chipset 
specific
          hwif->ide_dma_check implementations, for ide-cris it is 
cris_dma_check()
          function so there no behavior change here ]
    
    v2:
    * updated patch description (thanks to Alan Cox for the feedback)
    
    v3:
    * updated for scc_pata driver
    
    Signed-off-by: Bartlomiej Zolnierkiewicz <[EMAIL PROTECTED]>
---
 drivers/ide/cris/ide-cris.c    |   12 +++++-------
 drivers/ide/ide-dma.c          |    3 +++
 drivers/ide/ide-lib.c          |   15 +++++++++++++++
 drivers/ide/pci/aec62xx.c      |   14 +++-----------
 drivers/ide/pci/atiixp.c       |   14 +++-----------
 drivers/ide/pci/cmd64x.c       |   14 +++-----------
 drivers/ide/pci/cs5535.c       |   13 +++----------
 drivers/ide/pci/hpt34x.c       |   16 ++++------------
 drivers/ide/pci/hpt366.c       |   11 +++--------
 drivers/ide/pci/pdc202xx_new.c |   12 +++---------
 drivers/ide/pci/pdc202xx_old.c |   14 +++-----------
 drivers/ide/pci/piix.c         |   12 +++---------
 drivers/ide/pci/serverworks.c  |   14 +++-----------
 drivers/ide/pci/siimage.c      |   14 +++-----------
 drivers/ide/pci/sis5513.c      |   14 +++-----------
 drivers/ide/pci/slc90e66.c     |   12 +++---------
 drivers/ide/pci/tc86c001.c     |   12 +++---------
 drivers/ide/pci/triflex.c      |    9 ++-------
 drivers/ide/ppc/scc_pata.c     |   13 ++++---------
 include/linux/ide.h            |    1 +
 20 files changed, 73 insertions(+), 166 deletions(-)

diff --git a/drivers/ide/cris/ide-cris.c b/drivers/ide/cris/ide-cris.c
index 5797e0b..7afb715 100644
--- a/drivers/ide/cris/ide-cris.c
+++ b/drivers/ide/cris/ide-cris.c
@@ -821,6 +821,9 @@ init_e100_ide (void)
                hwif->ultra_mask = cris_ultra_mask;
                hwif->mwdma_mask = 0x07; /* Multiword DMA 0-2 */
                hwif->swdma_mask = 0x07; /* Singleword DMA 0-2 */
+               hwif->autodma = 1;
+               hwif->drives[0].autodma = 1;
+               hwif->drives[1].autodma = 1;
        }
 
        /* Reset pulse */
@@ -1046,14 +1049,9 @@ static ide_startstop_t cris_dma_intr (ide_drive_t *drive)
 static int cris_dma_check(ide_drive_t *drive)
 {
        ide_hwif_t *hwif = drive->hwif;
-       struct hd_driveid* id = drive->id;
 
-       if (id && (id->capability & 1)) {
-               if (ide_use_dma(drive)) {
-                       if (cris_config_drive_for_dma(drive))
-                               return hwif->ide_dma_on(drive);
-               }
-       }
+       if (ide_use_dma(drive) && cris_config_drive_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
        return hwif->ide_dma_off_quietly(drive);
 }
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 56efed6..941846c 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -680,6 +680,9 @@ int ide_use_dma(ide_drive_t *drive)
        struct hd_driveid *id = drive->id;
        ide_hwif_t *hwif = drive->hwif;
 
+       if ((id->capability & 1) == 0 || drive->autodma == 0)
+               return 0;
+
        /* consult the list of known "bad" drives */
        if (__ide_dma_bad_drive(drive))
                return 0;
diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c
index bea5e13..8afce4c 100644
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -205,6 +205,21 @@ int ide_dma_enable (ide_drive_t *drive)
 
 EXPORT_SYMBOL(ide_dma_enable);
 
+int ide_use_fast_pio(ide_drive_t *drive)
+{
+       struct hd_driveid *id = drive->id;
+
+       if ((id->capability & 1) && drive->autodma)
+               return 1;
+
+       if ((id->capability & 8) || (id->field_valid & 2))
+               return 1;
+
+       return 0;
+}
+
+EXPORT_SYMBOL_GPL(ide_use_fast_pio);
+
 /*
  * Standard (generic) timings for PIO modes, from ATA2 specification.
  * These timings are for access to the IDE data port register *only*.
diff --git a/drivers/ide/pci/aec62xx.c b/drivers/ide/pci/aec62xx.c
index cac12c3..1995073 100644
--- a/drivers/ide/pci/aec62xx.c
+++ b/drivers/ide/pci/aec62xx.c
@@ -210,19 +210,11 @@ static void aec62xx_tune_drive (ide_drive_t *drive, u8 
pio)
 static int aec62xx_config_drive_xfer_rate (ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
-       if ((id->capability & 1) && drive->autodma) {
+       if (ide_use_dma(drive) && config_chipset_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-               if (ide_use_dma(drive)) {
-                       if (config_chipset_for_dma(drive))
-                               return hwif->ide_dma_on(drive);
-               }
-
-               goto fast_ata_pio;
-
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                aec62xx_tune_drive(drive, 5);
                return hwif->ide_dma_off_quietly(drive);
        }
diff --git a/drivers/ide/pci/atiixp.c b/drivers/ide/pci/atiixp.c
index 922b315..dfc738c 100644
--- a/drivers/ide/pci/atiixp.c
+++ b/drivers/ide/pci/atiixp.c
@@ -253,22 +253,14 @@ static int atiixp_config_drive_for_dma(ide_drive_t *drive)
 static int atiixp_dma_check(ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
        u8 tspeed, speed;
 
        drive->init_speed = 0;
 
-       if ((id->capability & 1) && drive->autodma) {
+       if (ide_use_dma(drive) && atiixp_config_drive_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-               if (ide_use_dma(drive)) {
-                       if (atiixp_config_drive_for_dma(drive))
-                               return hwif->ide_dma_on(drive);
-               }
-
-               goto fast_ata_pio;
-
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                tspeed = ide_get_best_pio_mode(drive, 255, 5, NULL);
                speed = atiixp_dma_2_pio(XFER_PIO_0 + tspeed) + XFER_PIO_0;
                hwif->speedproc(drive, speed);
diff --git a/drivers/ide/pci/cmd64x.c b/drivers/ide/pci/cmd64x.c
index 009fc91..b1f9f5f 100644
--- a/drivers/ide/pci/cmd64x.c
+++ b/drivers/ide/pci/cmd64x.c
@@ -475,19 +475,11 @@ static int config_chipset_for_dma (ide_drive_t *drive)
 static int cmd64x_config_drive_for_dma (ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
-       if ((id != NULL) && ((id->capability & 1) != 0) && drive->autodma) {
+       if (ide_use_dma(drive) && config_chipset_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-               if (ide_use_dma(drive)) {
-                       if (config_chipset_for_dma(drive))
-                               return hwif->ide_dma_on(drive);
-               }
-
-               goto fast_ata_pio;
-
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                config_chipset_for_pio(drive, 1);
                return hwif->ide_dma_off_quietly(drive);
        }
diff --git a/drivers/ide/pci/cs5535.c b/drivers/ide/pci/cs5535.c
index 5c5aec2..e47653f 100644
--- a/drivers/ide/pci/cs5535.c
+++ b/drivers/ide/pci/cs5535.c
@@ -196,21 +196,14 @@ static int cs5535_config_drive_for_dma(ide_drive_t *drive)
 static int cs5535_dma_check(ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = drive->hwif;
-       struct hd_driveid *id   = drive->id;
        u8 speed;
 
        drive->init_speed = 0;
 
-       if ((id->capability & 1) && drive->autodma) {
-               if (ide_use_dma(drive)) {
-                       if (cs5535_config_drive_for_dma(drive))
-                               return hwif->ide_dma_on(drive);
-               }
-
-               goto fast_ata_pio;
+       if (ide_use_dma(drive) && cs5535_config_drive_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                speed = ide_get_best_pio_mode(drive, 255, 4, NULL);
                cs5535_set_drive(drive, speed);
                return hwif->ide_dma_off_quietly(drive);
diff --git a/drivers/ide/pci/hpt34x.c b/drivers/ide/pci/hpt34x.c
index 0de3b61..0830089 100644
--- a/drivers/ide/pci/hpt34x.c
+++ b/drivers/ide/pci/hpt34x.c
@@ -110,25 +110,17 @@ static int config_chipset_for_dma (ide_drive_t *drive)
 static int hpt34x_config_drive_xfer_rate (ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
        drive->init_speed = 0;
 
-       if (id && (id->capability & 1) && drive->autodma) {
-
-               if (ide_use_dma(drive)) {
-                       if (config_chipset_for_dma(drive))
+       if (ide_use_dma(drive) && config_chipset_for_dma(drive))
 #ifndef CONFIG_HPT34X_AUTODMA
-                               return hwif->ide_dma_off_quietly(drive);
+               return hwif->ide_dma_off_quietly(drive);
 #else
-                               return hwif->ide_dma_on(drive);
+               return hwif->ide_dma_on(drive);
 #endif
-               }
-
-               goto fast_ata_pio;
 
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                hpt34x_tune_drive(drive, 255);
                return hwif->ide_dma_off_quietly(drive);
        }
diff --git a/drivers/ide/pci/hpt366.c b/drivers/ide/pci/hpt366.c
index 06dce09..d3f6f9d 100644
--- a/drivers/ide/pci/hpt366.c
+++ b/drivers/ide/pci/hpt366.c
@@ -737,18 +737,13 @@ static void hpt3xx_maskproc(ide_drive_t *drive, int mask)
 static int hpt366_config_drive_xfer_rate(ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
        drive->init_speed = 0;
 
-       if ((id->capability & 1) && drive->autodma) {
-               if (ide_use_dma(drive) && config_chipset_for_dma(drive))
-                       return hwif->ide_dma_on(drive);
-
-               goto fast_ata_pio;
+       if (ide_use_dma(drive) && config_chipset_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                hpt3xx_tune_drive(drive, 255);
                return hwif->ide_dma_off_quietly(drive);
        }
diff --git a/drivers/ide/pci/pdc202xx_new.c b/drivers/ide/pci/pdc202xx_new.c
index 236a031..b13a06c 100644
--- a/drivers/ide/pci/pdc202xx_new.c
+++ b/drivers/ide/pci/pdc202xx_new.c
@@ -282,19 +282,13 @@ static int config_chipset_for_dma(ide_drive_t *drive)
 static int pdcnew_config_drive_xfer_rate(ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
        drive->init_speed = 0;
 
-       if ((id->capability & 1) && drive->autodma) {
-
-               if (ide_use_dma(drive) && config_chipset_for_dma(drive))
-                       return hwif->ide_dma_on(drive);
-
-               goto fast_ata_pio;
+       if (ide_use_dma(drive) && config_chipset_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                hwif->tuneproc(drive, 255);
                return hwif->ide_dma_off_quietly(drive);
        }
diff --git a/drivers/ide/pci/pdc202xx_old.c b/drivers/ide/pci/pdc202xx_old.c
index 80eb6d2..a2be3d2 100644
--- a/drivers/ide/pci/pdc202xx_old.c
+++ b/drivers/ide/pci/pdc202xx_old.c
@@ -323,21 +323,13 @@ chipset_is_set:
 static int pdc202xx_config_drive_xfer_rate (ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
        drive->init_speed = 0;
 
-       if (id && (id->capability & 1) && drive->autodma) {
-
-               if (ide_use_dma(drive)) {
-                       if (config_chipset_for_dma(drive))
-                               return hwif->ide_dma_on(drive);
-               }
-
-               goto fast_ata_pio;
+       if (ide_use_dma(drive) && config_chipset_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                pdc202xx_tune_drive(drive, 255);
                return hwif->ide_dma_off_quietly(drive);
        }
diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index 2473344..85e8a78 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -387,19 +387,13 @@ static int piix_config_drive_for_dma (ide_drive_t *drive)
 static int piix_config_drive_xfer_rate (ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
        drive->init_speed = 0;
 
-       if ((id->capability & 1) && drive->autodma) {
+       if (ide_use_dma(drive) && piix_config_drive_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-               if (ide_use_dma(drive) && piix_config_drive_for_dma(drive))
-                       return hwif->ide_dma_on(drive);
-
-               goto fast_ata_pio;
-
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                /* Find best PIO mode. */
                (void) hwif->speedproc(drive, XFER_PIO_0 +
                                       ide_get_best_pio_mode(drive, 255, 4, 
NULL));
diff --git a/drivers/ide/pci/serverworks.c b/drivers/ide/pci/serverworks.c
index 81a0742..9e92e7b 100644
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -316,21 +316,13 @@ static int config_chipset_for_dma (ide_drive_t *drive)
 static int svwks_config_drive_xfer_rate (ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
        drive->init_speed = 0;
 
-       if ((id->capability & 1) && drive->autodma) {
+       if (ide_use_dma(drive) && config_chipset_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-               if (ide_use_dma(drive)) {
-                       if (config_chipset_for_dma(drive))
-                               return hwif->ide_dma_on(drive);
-               }
-
-               goto fast_ata_pio;
-
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                config_chipset_for_pio(drive);
                //      hwif->tuneproc(drive, 5);
                return hwif->ide_dma_off_quietly(drive);
diff --git a/drivers/ide/pci/siimage.c b/drivers/ide/pci/siimage.c
index ad98510..367733c 100644
--- a/drivers/ide/pci/siimage.c
+++ b/drivers/ide/pci/siimage.c
@@ -415,19 +415,11 @@ static int config_chipset_for_dma (ide_drive_t *drive)
 static int siimage_config_drive_for_dma (ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
-       if ((id->capability & 1) != 0 && drive->autodma) {
+       if (ide_use_dma(drive) && config_chipset_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-               if (ide_use_dma(drive)) {
-                       if (config_chipset_for_dma(drive))
-                               return hwif->ide_dma_on(drive);
-               }
-
-               goto fast_ata_pio;
-
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                config_chipset_for_pio(drive, 1);
                return hwif->ide_dma_off_quietly(drive);
        }
diff --git a/drivers/ide/pci/sis5513.c b/drivers/ide/pci/sis5513.c
index e71552e..4fff663 100644
--- a/drivers/ide/pci/sis5513.c
+++ b/drivers/ide/pci/sis5513.c
@@ -670,23 +670,15 @@ static int config_chipset_for_dma (ide_drive_t *drive)
 static int sis5513_config_xfer_rate(ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
        config_art_rwp_pio(drive, 5);
 
        drive->init_speed = 0;
 
-       if (id && (id->capability & 1) && drive->autodma) {
+       if (ide_use_dma(drive) && config_chipset_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-               if (ide_use_dma(drive)) {
-                       if (config_chipset_for_dma(drive))
-                               return hwif->ide_dma_on(drive);
-               }
-
-               goto fast_ata_pio;
-
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                sis5513_tune_drive(drive, 5);
                return hwif->ide_dma_off_quietly(drive);
        }
diff --git a/drivers/ide/pci/slc90e66.c b/drivers/ide/pci/slc90e66.c
index 2663ddb..4042fd8 100644
--- a/drivers/ide/pci/slc90e66.c
+++ b/drivers/ide/pci/slc90e66.c
@@ -180,19 +180,13 @@ static int slc90e66_config_drive_for_dma (ide_drive_t 
*drive)
 static int slc90e66_config_drive_xfer_rate (ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
        drive->init_speed = 0;
 
-       if ((id->capability & 1) && drive->autodma) {
+       if (ide_use_dma(drive) && slc90e66_config_drive_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-               if (ide_use_dma(drive) && slc90e66_config_drive_for_dma(drive))
-                       return hwif->ide_dma_on(drive);
-
-               goto fast_ata_pio;
-
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                (void) hwif->speedproc(drive, XFER_PIO_0 +
                                       ide_get_best_pio_mode(drive, 255, 4, 
NULL));
                return hwif->ide_dma_off_quietly(drive);
diff --git a/drivers/ide/pci/tc86c001.c b/drivers/ide/pci/tc86c001.c
index 2ad72bb..4e89380 100644
--- a/drivers/ide/pci/tc86c001.c
+++ b/drivers/ide/pci/tc86c001.c
@@ -186,17 +186,11 @@ static int config_chipset_for_dma(ide_drive_t *drive)
 static int tc86c001_config_drive_xfer_rate(ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
-       if ((id->capability & 1) && drive->autodma) {
+       if (ide_use_dma(drive) && config_chipset_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
-               if (ide_use_dma(drive) && config_chipset_for_dma(drive))
-                       return hwif->ide_dma_on(drive);
-
-               goto fast_ata_pio;
-
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-fast_ata_pio:
+       if (ide_use_fast_pio(drive)) {
                tc86c001_tune_drive(drive, 255);
                return hwif->ide_dma_off_quietly(drive);
        }
diff --git a/drivers/ide/pci/triflex.c b/drivers/ide/pci/triflex.c
index b0d29cd..1f5f675 100644
--- a/drivers/ide/pci/triflex.c
+++ b/drivers/ide/pci/triflex.c
@@ -114,14 +114,9 @@ static int triflex_config_drive_for_dma(ide_drive_t *drive)
 static int triflex_config_drive_xfer_rate(ide_drive_t *drive)
 {
        ide_hwif_t *hwif        = HWIF(drive);
-       struct hd_driveid *id   = drive->id;
 
-       if ((id->capability & 1) && drive->autodma) {
-               if (ide_use_dma(drive)) {
-                       if (triflex_config_drive_for_dma(drive))
-                               return hwif->ide_dma_on(drive);
-               }
-       }
+       if (ide_use_dma(drive) && triflex_config_drive_for_dma(drive))
+               return hwif->ide_dma_on(drive);
 
        hwif->tuneproc(drive, 255);
        return hwif->ide_dma_off_quietly(drive);
diff --git a/drivers/ide/ppc/scc_pata.c b/drivers/ide/ppc/scc_pata.c
index 65ad8ab..0ab26ea 100644
--- a/drivers/ide/ppc/scc_pata.c
+++ b/drivers/ide/ppc/scc_pata.c
@@ -383,16 +383,11 @@ static int scc_config_chipset_for_dma(ide_drive_t *drive)
 static int scc_config_drive_for_dma(ide_drive_t *drive)
 {
        ide_hwif_t *hwif = HWIF(drive);
-       struct hd_driveid *id = drive->id;
 
-       if ((id->capability & 1) != 0 && drive->autodma) {
-               if (ide_use_dma(drive)) {
-                       if (scc_config_chipset_for_dma(drive))
-                               return hwif->ide_dma_on(drive);
-               }
-               goto fast_ata_pio;
-       } else if ((id->capability & 8) || (id->field_valid & 2)) {
-       fast_ata_pio:
+       if (ide_use_dma(drive) && scc_config_chipset_for_dma(drive))
+               return hwif->ide_dma_on(drive);
+
+       if (ide_use_fast_pio(drive)) {
                hwif->tuneproc(drive, 4);
                hwif->ide_dma_off_quietly(drive);
        }
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 40b5fa2..9e1a8b9 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1352,6 +1352,7 @@ extern int ide_dma_enable(ide_drive_t *drive);
 extern char *ide_xfer_verbose(u8 xfer_rate);
 extern void ide_toggle_bounce(ide_drive_t *drive, int on);
 extern int ide_set_xfer_rate(ide_drive_t *drive, u8 rate);
+int ide_use_fast_pio(ide_drive_t *);
 
 u8 ide_dump_status(ide_drive_t *, const char *, u8);
 
-
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