ide: remove ->ide_dma_check (take 2)

* Add IDE_HFLAG_TRUST_BIOS_FOR_DMA host flag for host drivers that depend
  on BIOS for programming device/controller for DMA.  Set it in cy82c693,
  generic, ns87415, opti621 and trm290 host drivers.

* Add IDE_HFLAG_VDMA host flag for host drivers using VDMA.  Set it in cs5520
  host driver.

* Teach ide_tune_dma() about IDE_HFLAG_TRUST_BIOS_FOR_DMA flag.

* Add generic ide_dma_check() helper and remove all open coded ->ide_dma_check
  implementations.  Fix all places checking for presence of ->ide_dma_check
  hook to check for ->ide_dma_on instead.

* Remove no longer needed code from config_drive_for_dma().

* Make ide_tune_dma() static.

v2:
* Fix config_drive_for_dma() return values.

* Fix ide-dma.c build for CONFIG_BLK_DEV_IDEDMA_PCI=n by adding
  dummy config_drive_for_dma() inline.

* Fix IDE_HFLAG_TRUST_BIOS_FOR_DMA handling in ide_dma_check().

* Fix init_hwif_it8213() comment.

There should be no functionality changes caused by this patch.

Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

41 files changed, 76 insertions, 499 deletions

diff --git a/drivers/ide/arm/icside.c b/drivers/ide/arm/icside.c
index bd1f5b670378..0c6ce2faf8f5 100644
--- a/drivers/ide/arm/icside.c
+++ b/drivers/ide/arm/icside.c
@@ -309,14 +309,6 @@ static int icside_dma_on(ide_drive_t *drive)
         return 0;
 }
 
-static int icside_dma_check(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        return -1;
-}
-
 static int icside_dma_end(ide_drive_t *drive)
 {
         ide_hwif_t *hwif = HWIF(drive);
@@ -434,7 +426,6 @@ static void icside_dma_init(ide_hwif_t *hwif)
         hwif->set_dma_mode      = icside_set_dma_mode;
         hwif->autodma           = 1;
 
-        hwif->ide_dma_check     = icside_dma_check;
         hwif->dma_host_off      = icside_dma_host_off;
         hwif->dma_off_quietly   = icside_dma_off_quietly;
         hwif->dma_host_on       = icside_dma_host_on;
diff --git a/drivers/ide/cris/ide-cris.c b/drivers/ide/cris/ide-cris.c
index 303f26559db8..1ee078d43dbf 100644
--- a/drivers/ide/cris/ide-cris.c
+++ b/drivers/ide/cris/ide-cris.c
@@ -664,7 +664,6 @@ cris_ide_inb(unsigned long reg)
         return (unsigned char)cris_ide_inw(reg);
 }
 
-static int cris_dma_check (ide_drive_t *drive);
 static int cris_dma_end (ide_drive_t *drive);
 static int cris_dma_setup (ide_drive_t *drive);
 static void cris_dma_exec_cmd (ide_drive_t *drive, u8 command);
@@ -792,7 +791,6 @@ init_e100_ide (void)
                 hwif->ata_output_data = &cris_ide_output_data;
                 hwif->atapi_input_bytes = &cris_atapi_input_bytes;
                 hwif->atapi_output_bytes = &cris_atapi_output_bytes;
-                hwif->ide_dma_check = &cris_dma_check;
                 hwif->ide_dma_end = &cris_dma_end;
                 hwif->dma_setup = &cris_dma_setup;
                 hwif->dma_exec_cmd = &cris_dma_exec_cmd;
@@ -1020,16 +1018,6 @@ static ide_startstop_t cris_dma_intr (ide_drive_t *drive)
  * the caller should revert to PIO for the current request.
  */
 
-static int cris_dma_check(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static int cris_dma_end(ide_drive_t *drive)
 {
         drive->waiting_for_dma = 0;
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index a4cbbbaccde9..716a4fdcc0b5 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -338,35 +338,30 @@ static int config_drive_for_dma (ide_drive_t *drive)
         ide_hwif_t *hwif = drive->hwif;
         struct hd_driveid *id = drive->id;
 
-        /* consult the list of known "bad" drives */
-        if (__ide_dma_bad_drive(drive))
-                return -1;
-
         if (drive->media != ide_disk && hwif->atapi_dma == 0)
-                return -1;
+                return 0;
 
-        if ((id->capability & 1) && drive->autodma) {
-                /*
-                 * Enable DMA on any drive that has
-                 * UltraDMA (mode 0/1/2/3/4/5/6) enabled
-                 */
-                if ((id->field_valid & 4) && ((id->dma_ultra >> 8) & 0x7f))
-                        return 0;
-                /*
-                 * Enable DMA on any drive that has mode2 DMA
-                 * (multi or single) enabled
-                 */
-                if (id->field_valid & 2)        /* regular DMA */
-                        if ((id->dma_mword & 0x404) == 0x404 ||
-                            (id->dma_1word & 0x404) == 0x404)
-                                return 0;
-
-                /* Consult the list of known "good" drives */
-                if (ide_dma_good_drive(drive))
-                        return 0;
-        }
+        /*
+         * Enable DMA on any drive that has
+         * UltraDMA (mode 0/1/2/3/4/5/6) enabled
+         */
+        if ((id->field_valid & 4) && ((id->dma_ultra >> 8) & 0x7f))
+                return 1;
+
+        /*
+         * Enable DMA on any drive that has mode2 DMA
+         * (multi or single) enabled
+         */
+        if (id->field_valid & 2)        /* regular DMA */
+                if ((id->dma_mword & 0x404) == 0x404 ||
+                    (id->dma_1word & 0x404) == 0x404)
+                        return 1;
 
-        return -1;
+        /* Consult the list of known "good" drives */
+        if (ide_dma_good_drive(drive))
+                return 1;
+
+        return 0;
 }
 
 /**
@@ -627,6 +622,8 @@ static int __ide_dma_test_irq(ide_drive_t *drive)
                         drive->name, __FUNCTION__);
         return 0;
 }
+#else
+static inline int config_drive_for_dma(ide_drive_t *drive) { return 0; }
 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
 
 int __ide_dma_bad_drive (ide_drive_t *drive)
@@ -758,7 +755,7 @@ u8 ide_find_dma_mode(ide_drive_t *drive, u8 req_mode)
 
 EXPORT_SYMBOL_GPL(ide_find_dma_mode);
 
-int ide_tune_dma(ide_drive_t *drive)
+static int ide_tune_dma(ide_drive_t *drive)
 {
         u8 speed;
 
@@ -769,6 +766,9 @@ int ide_tune_dma(ide_drive_t *drive)
         if (__ide_dma_bad_drive(drive))
                 return 0;
 
+        if (drive->hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
+                return config_drive_for_dma(drive);
+
         speed = ide_max_dma_mode(drive);
 
         if (!speed)
@@ -785,6 +785,23 @@ int ide_tune_dma(ide_drive_t *drive)
 
 EXPORT_SYMBOL_GPL(ide_tune_dma);
 
+static int ide_dma_check(ide_drive_t *drive)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        int vdma = (hwif->host_flags & IDE_HFLAG_VDMA)? 1 : 0;
+
+        if (!vdma && ide_tune_dma(drive))
+                return 0;
+
+        /* TODO: always do PIO fallback */
+        if (hwif->host_flags & IDE_HFLAG_TRUST_BIOS_FOR_DMA)
+                return -1;
+
+        ide_set_max_pio(drive);
+
+        return vdma ? 0 : -1;
+}
+
 void ide_dma_verbose(ide_drive_t *drive)
 {
         struct hd_driveid *id   = drive->id;
@@ -842,7 +859,7 @@ int ide_set_dma(ide_drive_t *drive)
         ide_hwif_t *hwif = drive->hwif;
         int rc;
 
-        rc = hwif->ide_dma_check(drive);
+        rc = ide_dma_check(drive);
 
         switch(rc) {
         case -1: /* DMA needs to be disabled */
@@ -1019,8 +1036,6 @@ void ide_setup_dma (ide_hwif_t *hwif, unsigned long dma_base, unsigned int num_p
                 hwif->ide_dma_on = &__ide_dma_on;
         if (!hwif->dma_host_on)
                 hwif->dma_host_on = &ide_dma_host_on;
-        if (!hwif->ide_dma_check)
-                hwif->ide_dma_check = &config_drive_for_dma;
         if (!hwif->dma_setup)
                 hwif->dma_setup = &ide_dma_setup;
         if (!hwif->dma_exec_cmd)
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 04273d3c147c..ec835e37e729 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -219,11 +219,11 @@ static ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *
 
         case ide_pm_restore_dma:        /* Resume step 3 (restore DMA) */
                 /*
-                 * Right now, all we do is call hwif->ide_dma_check(drive),
+                 * Right now, all we do is call ide_set_dma(drive),
                  * we could be smarter and check for current xfer_speed
                  * in struct drive etc...
                  */
-                if (drive->hwif->ide_dma_check == NULL)
+                if (drive->hwif->ide_dma_on == NULL)
                         break;
                 drive->hwif->dma_off_quietly(drive);
                 /*
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index aa738833bed5..d4d790f91f91 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -776,7 +776,7 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 //              msleep(50);
 
 #ifdef CONFIG_BLK_DEV_IDEDMA
-        if (hwif->ide_dma_check)         /* check if host supports DMA */
+        if (hwif->ide_dma_on)   /* check if host supports DMA */
                 hwif->dma_host_off(drive);
 #endif
 
@@ -830,7 +830,7 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 #ifdef CONFIG_BLK_DEV_IDEDMA
         if (speed >= XFER_SW_DMA_0)
                 hwif->dma_host_on(drive);
-        else if (hwif->ide_dma_check)   /* check if host supports DMA */
+        else if (hwif->ide_dma_on)      /* check if host supports DMA */
                 hwif->dma_off_quietly(drive);
 #endif
 
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 34b1fb65bc79..c2d69d2d3044 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -844,7 +844,7 @@ static void probe_hwif(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
                          * Move here to prevent module loading clashing.
                          */
         //              drive->autodma = hwif->autodma;
-                        if (hwif->ide_dma_check) {
+                        if (hwif->ide_dma_on) {
                                 /*
                                  * Force DMAing for the beginning of the check.
                                  * Some chipsets appear to do interesting
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 5c0e4078b5cb..4834cca5cb31 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -418,7 +418,6 @@ static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
         hwif->dma_start                 = tmp_hwif->dma_start;
         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
-        hwif->ide_dma_check             = tmp_hwif->ide_dma_check;
         hwif->ide_dma_on                = tmp_hwif->ide_dma_on;
         hwif->dma_off_quietly           = tmp_hwif->dma_off_quietly;
         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
@@ -823,7 +822,7 @@ int set_using_dma(ide_drive_t *drive, int arg)
         if (!drive->id || !(drive->id->capability & 1))
                 goto out;
 
-        if (hwif->ide_dma_check == NULL)
+        if (hwif->ide_dma_on == NULL)
                 goto out;
 
         err = -EBUSY;
diff --git a/drivers/ide/mips/au1xxx-ide.c b/drivers/ide/mips/au1xxx-ide.c
index 1c4732958fb2..cd00081fb278 100644
--- a/drivers/ide/mips/au1xxx-ide.c
+++ b/drivers/ide/mips/au1xxx-ide.c
@@ -380,16 +380,6 @@ static u8 auide_mdma_filter(ide_drive_t *drive)
         return drive->hwif->mwdma_mask;
 }
 
-static int auide_dma_check(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static int auide_dma_test_irq(ide_drive_t *drive)
 {       
         if (drive->waiting_for_dma == 0)
@@ -700,7 +690,6 @@ static int au_ide_probe(struct device *dev)
 
         hwif->mdma_filter               = &auide_mdma_filter;
 
-        hwif->ide_dma_check             = &auide_dma_check;
         hwif->dma_exec_cmd              = &auide_dma_exec_cmd;
         hwif->dma_start                 = &auide_dma_start;
         hwif->ide_dma_end               = &auide_dma_end;
diff --git a/drivers/ide/pci/aec62xx.c b/drivers/ide/pci/aec62xx.c
index 91bf5beba5ce..97b39cebe63a 100644
--- a/drivers/ide/pci/aec62xx.c
+++ b/drivers/ide/pci/aec62xx.c
@@ -141,16 +141,6 @@ static void aec_set_pio_mode(ide_drive_t *drive, const u8 pio)
         drive->hwif->set_dma_mode(drive, pio + XFER_PIO_0);
 }
 
-static int aec62xx_config_drive_xfer_rate (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static void aec62xx_dma_lost_irq (ide_drive_t *drive)
 {
         switch (HWIF(drive)->pci_dev->device) {
@@ -214,7 +204,6 @@ static void __devinit init_hwif_aec62xx(ide_hwif_t *hwif)
         hwif->ultra_mask = hwif->cds->udma_mask;
         hwif->mwdma_mask = 0x07;
 
-        hwif->ide_dma_check     = &aec62xx_config_drive_xfer_rate;
         hwif->dma_lost_irq      = &aec62xx_dma_lost_irq;
 
         if (dev->device == PCI_DEVICE_ID_ARTOP_ATP850UF) {
diff --git a/drivers/ide/pci/alim15x3.c b/drivers/ide/pci/alim15x3.c
index 9582794eb65a..64b28cadb2b4 100644
--- a/drivers/ide/pci/alim15x3.c
+++ b/drivers/ide/pci/alim15x3.c
@@ -437,24 +437,6 @@ static void ali_set_dma_mode(ide_drive_t *drive, const u8 speed)
 }
 
 /**
- *      ali15x3_config_drive_for_dma    -       configure for DMA
- *      @drive: drive to configure
- *
- *      Configure a drive for DMA operation. If DMA is not possible we
- *      drop the drive into PIO mode instead.
- */
-
-static int ali15x3_config_drive_for_dma(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/**
  *      ali15x3_dma_setup       -       begin a DMA phase
  *      @drive: target device
  *
@@ -713,7 +695,6 @@ static void __devinit init_hwif_common_ali15x3 (ide_hwif_t *hwif)
         hwif->mwdma_mask = 0x07;
         hwif->swdma_mask = 0x07;
 
-        hwif->ide_dma_check = &ali15x3_config_drive_for_dma;
         hwif->dma_setup = &ali15x3_dma_setup;
 
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
diff --git a/drivers/ide/pci/amd74xx.c b/drivers/ide/pci/amd74xx.c
index 6ff4089a2379..6fa5b3f87b8f 100644
--- a/drivers/ide/pci/amd74xx.c
+++ b/drivers/ide/pci/amd74xx.c
@@ -264,16 +264,6 @@ static void amd_set_pio_mode(ide_drive_t *drive, const u8 pio)
         amd_set_drive(drive, XFER_PIO_0 + pio);
 }
 
-static int amd74xx_ide_dma_check(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 /*
  * The initialization callback. Here we determine the IDE chip type
  * and initialize its drive independent registers.
@@ -415,7 +405,6 @@ static void __devinit init_hwif_amd74xx(ide_hwif_t *hwif)
                         hwif->cbl = ATA_CBL_PATA40;
         }
 
-        hwif->ide_dma_check = &amd74xx_ide_dma_check;
         if (!noautodma)
                 hwif->autodma = 1;
         hwif->drives[0].autodma = hwif->autodma;
diff --git a/drivers/ide/pci/atiixp.c b/drivers/ide/pci/atiixp.c
index b457df883dcb..1dfd068daf76 100644
--- a/drivers/ide/pci/atiixp.c
+++ b/drivers/ide/pci/atiixp.c
@@ -159,24 +159,6 @@ static void atiixp_set_dma_mode(ide_drive_t *drive, const u8 speed)
 }
 
 /**
- *      atiixp_dma_check        -       set up an IDE device
- *      @drive: IDE drive to configure
- *
- *      Set up the ATIIXP interface for the best available speed on this
- *      interface, preferring DMA to PIO.
- */
-
-static int atiixp_dma_check(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/**
  *      init_hwif_atiixp                -       fill in the hwif for the ATIIXP
  *      @hwif: IDE interface
  *
@@ -215,7 +197,7 @@ static void __devinit init_hwif_atiixp(ide_hwif_t *hwif)
 
         hwif->dma_host_on = &atiixp_dma_host_on;
         hwif->dma_host_off = &atiixp_dma_host_off;
-        hwif->ide_dma_check = &atiixp_dma_check;
+
         if (!noautodma)
                 hwif->autodma = 1;
 
diff --git a/drivers/ide/pci/cmd64x.c b/drivers/ide/pci/cmd64x.c
index 52790cb6bce4..5f421deb3f3e 100644
--- a/drivers/ide/pci/cmd64x.c
+++ b/drivers/ide/pci/cmd64x.c
@@ -330,16 +330,6 @@ static void cmd64x_set_dma_mode(ide_drive_t *drive, const u8 speed)
                 (void) pci_write_config_byte(dev, pciU, regU);
 }
 
-static int cmd64x_config_drive_for_dma (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static int cmd648_ide_dma_end (ide_drive_t *drive)
 {
         ide_hwif_t *hwif        = HWIF(drive);
@@ -546,8 +536,6 @@ static void __devinit init_hwif_cmd64x(ide_hwif_t *hwif)
         if (dev->device == PCI_DEVICE_ID_CMD_646 && rev < 5)
                 hwif->ultra_mask = 0x00;
 
-        hwif->ide_dma_check = &cmd64x_config_drive_for_dma;
-
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                 hwif->cbl = ata66_cmd64x(hwif);
 
diff --git a/drivers/ide/pci/cs5520.c b/drivers/ide/pci/cs5520.c
index fbce90048aec..74c3e6048ff2 100644
--- a/drivers/ide/pci/cs5520.c
+++ b/drivers/ide/pci/cs5520.c
@@ -105,15 +105,6 @@ static void cs5520_set_dma_mode(ide_drive_t *drive, const u8 speed)
         cs5520_set_pio_mode(drive, 0);
 }
 
-static int cs5520_config_drive_xfer_rate(ide_drive_t *drive)
-{
-        /* Tune the drive for PIO modes up to PIO 4 */  
-        ide_set_max_pio(drive);
-
-        /* Then tell the core to use DMA operations */
-        return 0;
-}
-
 /*
  *      We provide a callback for our nonstandard DMA location
  */
@@ -148,7 +139,6 @@ static void __devinit init_hwif_cs5520(ide_hwif_t *hwif)
                 return;
         }
 
-        hwif->ide_dma_check = &cs5520_config_drive_xfer_rate;
         hwif->ide_dma_on = &cs5520_dma_on;
 
         /* ATAPI is harder so leave it for now */
@@ -171,7 +161,8 @@ static void __devinit init_hwif_cs5520(ide_hwif_t *hwif)
                 .init_hwif      = init_hwif_cs5520,             \
                 .autodma        = AUTODMA,                      \
                 .bootable       = ON_BOARD,                     \
-                .host_flags     = IDE_HFLAG_ISA_PORTS,          \
+                .host_flags     = IDE_HFLAG_ISA_PORTS |         \
+                                  IDE_HFLAG_VDMA,               \
                 .pio_mask       = ATA_PIO4,                     \
         }
 
diff --git a/drivers/ide/pci/cs5530.c b/drivers/ide/pci/cs5530.c
index 1c82cd51f6d5..d37db0d7547c 100644
--- a/drivers/ide/pci/cs5530.c
+++ b/drivers/ide/pci/cs5530.c
@@ -104,24 +104,6 @@ out:
         return mask;
 }
 
-/**
- *      cs5530_config_dma       -       set DMA/UDMA mode
- *      @drive: drive to tune
- *
- *      cs5530_config_dma() handles setting of DMA/UDMA mode
- *      for both the chipset and drive.
- */
-
-static int cs5530_config_dma(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static void cs5530_set_dma_mode(ide_drive_t *drive, const u8 mode)
 {
         unsigned long basereg;
@@ -288,7 +270,7 @@ static void __devinit init_hwif_cs5530 (ide_hwif_t *hwif)
         hwif->mwdma_mask = 0x07;
 
         hwif->udma_filter = cs5530_udma_filter;
-        hwif->ide_dma_check = &cs5530_config_dma;
+
         if (!noautodma)
                 hwif->autodma = 1;
         hwif->drives[0].autodma = hwif->autodma;
diff --git a/drivers/ide/pci/cs5535.c b/drivers/ide/pci/cs5535.c
index 2a72b4f22ddf..4692c39c6996 100644
--- a/drivers/ide/pci/cs5535.c
+++ b/drivers/ide/pci/cs5535.c
@@ -157,16 +157,6 @@ static void cs5535_set_pio_mode(ide_drive_t *drive, const u8 pio)
         cs5535_set_speed(drive, XFER_PIO_0 + pio);
 }
 
-static int cs5535_dma_check(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static u8 __devinit cs5535_cable_detect(struct pci_dev *dev)
 {
         u8 bit;
@@ -197,8 +187,6 @@ static void __devinit init_hwif_cs5535(ide_hwif_t *hwif)
         if (hwif->dma_base == 0)
                 return;
 
-        hwif->ide_dma_check = &cs5535_dma_check;
-
         hwif->atapi_dma = 1;
         hwif->ultra_mask = 0x1F;
         hwif->mwdma_mask = 0x07;
diff --git a/drivers/ide/pci/cy82c693.c b/drivers/ide/pci/cy82c693.c
index dc278025d318..b8f98426e3e1 100644
--- a/drivers/ide/pci/cy82c693.c
+++ b/drivers/ide/pci/cy82c693.c
@@ -469,7 +469,7 @@ static ide_pci_device_t cy82c693_chipset __devinitdata = {
         .init_hwif      = init_hwif_cy82c693,
         .autodma        = AUTODMA,
         .bootable       = ON_BOARD,
-        .host_flags     = IDE_HFLAG_SINGLE,
+        .host_flags     = IDE_HFLAG_SINGLE | IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         .pio_mask       = ATA_PIO4,
 };
 
diff --git a/drivers/ide/pci/generic.c b/drivers/ide/pci/generic.c
index 48caa468b762..e8156c1ba63d 100644
--- a/drivers/ide/pci/generic.c
+++ b/drivers/ide/pci/generic.c
@@ -97,77 +97,92 @@ static ide_pci_device_t generic_chipsets[] __devinitdata = {
                 .init_hwif      = init_hwif_generic,
                 .autodma        = AUTODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 1 */
                 .name           = "NS87410",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = AUTODMA,
                 .enablebits     = {{0x43,0x08,0x08}, {0x47,0x08,0x08}},
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 2 */
                 .name           = "SAMURAI",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = AUTODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 3 */
                 .name           = "HT6565",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = AUTODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 4 */
                 .name           = "UM8673F",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = NODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 5 */
                 .name           = "UM8886A",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = NODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 6 */
                 .name           = "UM8886BF",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = NODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 7 */
                 .name           = "HINT_IDE",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = AUTODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 8 */
                 .name           = "VIA_IDE",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = NOAUTODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 9 */
                 .name           = "OPTI621V",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = NOAUTODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 10 */
                 .name           = "VIA8237SATA",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = AUTODMA,
                 .bootable       = OFF_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 11 */
                 .name           = "Piccolo0102",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = NOAUTODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 12 */
                 .name           = "Piccolo0103",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = NOAUTODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 13 */
                 .name           = "Piccolo0105",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = NOAUTODMA,
                 .bootable       = ON_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 14 */
                 .name           = "Revolution",
                 .init_hwif      = init_hwif_generic,
                 .autodma        = AUTODMA,
                 .bootable       = OFF_BOARD,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         }
 };
 
diff --git a/drivers/ide/pci/hpt34x.c b/drivers/ide/pci/hpt34x.c
index 69724887225c..449132583bb4 100644
--- a/drivers/ide/pci/hpt34x.c
+++ b/drivers/ide/pci/hpt34x.c
@@ -80,16 +80,6 @@ static void hpt34x_set_pio_mode(ide_drive_t *drive, const u8 pio)
         hpt34x_set_mode(drive, XFER_PIO_0 + pio);
 }
 
-static int hpt34x_config_drive_xfer_rate (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return -1;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 /*
  * If the BIOS does not set the IO base addaress to XX00, 343 will fail.
  */
@@ -156,7 +146,6 @@ static void __devinit init_hwif_hpt34x(ide_hwif_t *hwif)
         hwif->swdma_mask = 0x07;
 #endif
 
-        hwif->ide_dma_check = &hpt34x_config_drive_xfer_rate;
         if (!noautodma)
                 hwif->autodma = (pcicmd & PCI_COMMAND_MEMORY) ? 1 : 0;
         hwif->drives[0].autodma = hwif->autodma;
diff --git a/drivers/ide/pci/hpt366.c b/drivers/ide/pci/hpt366.c
index 992b60eeee3f..8cb6b74f0148 100644
--- a/drivers/ide/pci/hpt366.c
+++ b/drivers/ide/pci/hpt366.c
@@ -713,16 +713,6 @@ static void hpt3xx_maskproc(ide_drive_t *drive, int mask)
                            IDE_CONTROL_REG);
 }
 
-static int hpt366_config_drive_xfer_rate(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 /*
  * This is specific to the HPT366 UDMA chipset
  * by HighPoint|Triones Technologies, Inc.
@@ -1346,8 +1336,6 @@ static void __devinit init_hwif_hpt366(ide_hwif_t *hwif)
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                 hwif->cbl = (scr1 & ata66) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 
-        hwif->ide_dma_check             = &hpt366_config_drive_xfer_rate;
-
         if (chip_type >= HPT374) {
                 hwif->ide_dma_test_irq  = &hpt374_ide_dma_test_irq;
                 hwif->ide_dma_end       = &hpt374_ide_dma_end;
diff --git a/drivers/ide/pci/it8213.c b/drivers/ide/pci/it8213.c
index 6dab0daf4943..069152dd4697 100644
--- a/drivers/ide/pci/it8213.c
+++ b/drivers/ide/pci/it8213.c
@@ -158,32 +158,10 @@ static void it8213_set_dma_mode(ide_drive_t *drive, const u8 speed)
 }
 
 /**
- *      it8213_configure_drive_for_dma  -       set up for DMA transfers
- *      @drive: drive we are going to set up
- *
- *      Set up the drive for DMA, tune the controller and drive as
- *      required. If the drive isn't suitable for DMA or we hit
- *      other problems then we will drop down to PIO and set up
- *      PIO appropriately
- */
-
-static int it8213_config_drive_for_dma (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/**
  *      init_hwif_it8213        -       set up hwif structs
  *      @hwif: interface to set up
  *
- *      We do the basic set up of the interface structure. The IT8212
- *      requires several custom handlers so we override the default
- *      ide DMA handlers appropriately
+ *      We do the basic set up of the interface structure.
  */
 
 static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
@@ -208,8 +186,6 @@ static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
 
         pci_read_config_byte(hwif->pci_dev, 0x42, &reg42h);
 
-        hwif->ide_dma_check = &it8213_config_drive_for_dma;
-
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                 hwif->cbl = (reg42h & 0x02) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 
diff --git a/drivers/ide/pci/it821x.c b/drivers/ide/pci/it821x.c
index 1b69d82478c6..25595acc299f 100644
--- a/drivers/ide/pci/it821x.c
+++ b/drivers/ide/pci/it821x.c
@@ -416,26 +416,6 @@ static void it821x_set_dma_mode(ide_drive_t *drive, const u8 speed)
 }
 
 /**
- *      it821x_configure_drive_for_dma  -       set up for DMA transfers
- *      @drive: drive we are going to set up
- *
- *      Set up the drive for DMA, tune the controller and drive as
- *      required. If the drive isn't suitable for DMA or we hit
- *      other problems then we will drop down to PIO and set up
- *      PIO appropriately
- */
-
-static int it821x_config_drive_for_dma (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/**
  *      ata66_it821x    -       check for 80 pin cable
  *      @hwif: interface to check
  *
@@ -615,8 +595,6 @@ static void __devinit init_hwif_it821x(ide_hwif_t *hwif)
         hwif->ultra_mask = 0x7f;
         hwif->mwdma_mask = 0x07;
 
-        hwif->ide_dma_check = &it821x_config_drive_for_dma;
-
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                 hwif->cbl = ata66_it821x(hwif);
 
diff --git a/drivers/ide/pci/jmicron.c b/drivers/ide/pci/jmicron.c
index 582b4cae2b53..e4a4f1fb5be7 100644
--- a/drivers/ide/pci/jmicron.c
+++ b/drivers/ide/pci/jmicron.c
@@ -100,24 +100,6 @@ static void jmicron_set_dma_mode(ide_drive_t *drive, const u8 mode)
 }
 
 /**
- *      jmicron_configure_drive_for_dma -       set up for DMA transfers
- *      @drive: drive we are going to set up
- *
- *      As the JMicron snoops for timings all we actually need to do is
- *      make sure we don't set an invalid mode.
- */
-
-static int jmicron_config_drive_for_dma (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/**
  *      init_hwif_jmicron       -       set up hwif structs
  *      @hwif: interface to set up
  *
@@ -139,8 +121,6 @@ static void __devinit init_hwif_jmicron(ide_hwif_t *hwif)
         hwif->ultra_mask = 0x7f;
         hwif->mwdma_mask = 0x07;
 
-        hwif->ide_dma_check = &jmicron_config_drive_for_dma;
-
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                 hwif->cbl = ata66_jmicron(hwif);
 
diff --git a/drivers/ide/pci/ns87415.c b/drivers/ide/pci/ns87415.c
index 465c935fdf25..422c234d6c98 100644
--- a/drivers/ide/pci/ns87415.c
+++ b/drivers/ide/pci/ns87415.c
@@ -274,6 +274,7 @@ static ide_pci_device_t ns87415_chipset __devinitdata = {
         .init_hwif      = init_hwif_ns87415,
         .autodma        = AUTODMA,
         .bootable       = ON_BOARD,
+        .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
 };
 
 static int __devinit ns87415_init_one(struct pci_dev *dev, const struct pci_device_id *id)
diff --git a/drivers/ide/pci/opti621.c b/drivers/ide/pci/opti621.c
index 9fa06393469a..38f8a4cb91d2 100644
--- a/drivers/ide/pci/opti621.c
+++ b/drivers/ide/pci/opti621.c
@@ -355,6 +355,7 @@ static ide_pci_device_t opti621_chipsets[] __devinitdata = {
                 .enablebits     = {{0x45,0x80,0x00}, {0x40,0x08,0x00}},
                 .bootable       = ON_BOARD,
                 .pio_mask       = ATA_PIO3,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         },{     /* 1 */
                 .name           = "OPTI621X",
                 .init_hwif      = init_hwif_opti621,
@@ -362,6 +363,7 @@ static ide_pci_device_t opti621_chipsets[] __devinitdata = {
                 .enablebits     = {{0x45,0x80,0x00}, {0x40,0x08,0x00}},
                 .bootable       = ON_BOARD,
                 .pio_mask       = ATA_PIO3,
+                .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
         }
 };
 
diff --git a/drivers/ide/pci/pdc202xx_new.c b/drivers/ide/pci/pdc202xx_new.c
index 9767232e2f8a..65e460dbe8b6 100644
--- a/drivers/ide/pci/pdc202xx_new.c
+++ b/drivers/ide/pci/pdc202xx_new.c
@@ -223,16 +223,6 @@ static u8 pdcnew_cable_detect(ide_hwif_t *hwif)
                 return ATA_CBL_PATA80;
 }
 
-static int pdcnew_config_drive_xfer_rate(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static int pdcnew_quirkproc(ide_drive_t *drive)
 {
         const char **list, *model = drive->id->model;
@@ -499,8 +489,6 @@ static void __devinit init_hwif_pdc202new(ide_hwif_t *hwif)
         hwif->ultra_mask = hwif->cds->udma_mask;
         hwif->mwdma_mask = 0x07;
 
-        hwif->ide_dma_check = &pdcnew_config_drive_xfer_rate;
-
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                 hwif->cbl = pdcnew_cable_detect(hwif);
 
diff --git a/drivers/ide/pci/pdc202xx_old.c b/drivers/ide/pci/pdc202xx_old.c
index b2c7b6e3edd5..4efc758c7638 100644
--- a/drivers/ide/pci/pdc202xx_old.c
+++ b/drivers/ide/pci/pdc202xx_old.c
@@ -179,16 +179,6 @@ static void pdc_old_disable_66MHz_clock(ide_hwif_t *hwif)
         outb(clock & ~(hwif->channel ? 0x08 : 0x02), clock_reg);
 }
 
-static int pdc202xx_config_drive_xfer_rate (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static int pdc202xx_quirkproc (ide_drive_t *drive)
 {
         const char **list, *model = drive->id->model;
@@ -344,7 +334,6 @@ static void __devinit init_hwif_pdc202xx(ide_hwif_t *hwif)
         hwif->swdma_mask = 0x07;
         hwif->atapi_dma = 1;
 
-        hwif->ide_dma_check = &pdc202xx_config_drive_xfer_rate;
         hwif->dma_lost_irq = &pdc202xx_dma_lost_irq;
         hwif->dma_timeout = &pdc202xx_dma_timeout;
 
diff --git a/drivers/ide/pci/piix.c b/drivers/ide/pci/piix.c
index dcb0701f10b5..d5a31e9f5727 100644
--- a/drivers/ide/pci/piix.c
+++ b/drivers/ide/pci/piix.c
@@ -255,24 +255,6 @@ static void piix_set_dma_mode(ide_drive_t *drive, const u8 speed)
 }
 
 /**
- *      piix_config_drive_xfer_rate     -       set up an IDE device
- *      @drive: IDE drive to configure
- *
- *      Set up the PIIX interface for the best available speed on this
- *      interface, preferring DMA to PIO.
- */
- 
-static int piix_config_drive_xfer_rate (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/**
  *      piix_is_ichx    -       check if ICHx
  *      @dev: PCI device to check
  *
@@ -432,7 +414,6 @@ static void __devinit init_hwif_piix(ide_hwif_t *hwif)
         if (no_piix_dma)
                 hwif->ultra_mask = hwif->mwdma_mask = hwif->swdma_mask = 0;
 
-        hwif->ide_dma_check = &piix_config_drive_xfer_rate;
         if (!noautodma)
                 hwif->autodma = 1;
 
diff --git a/drivers/ide/pci/sc1200.c b/drivers/ide/pci/sc1200.c
index 184249ed125b..38cfc8c2ea58 100644
--- a/drivers/ide/pci/sc1200.c
+++ b/drivers/ide/pci/sc1200.c
@@ -199,21 +199,6 @@ static void sc1200_set_dma_mode(ide_drive_t *drive, const u8 mode)
         }
 }
 
-/*
- * sc1200_config_dma() handles selection/setting of DMA/UDMA modes
- * for both the chipset and drive.
- */
-static int sc1200_config_dma (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-
 /*  Replacement for the standard ide_dma_end action in
  *  dma_proc.
  *
@@ -391,7 +376,6 @@ static void __devinit init_hwif_sc1200 (ide_hwif_t *hwif)
                 return;
 
         hwif->udma_filter = sc1200_udma_filter;
-        hwif->ide_dma_check = &sc1200_config_dma;
         hwif->ide_dma_end   = &sc1200_ide_dma_end;
 
         if (!noautodma)
diff --git a/drivers/ide/pci/scc_pata.c b/drivers/ide/pci/scc_pata.c
index f839bdeb903b..977b48e95ba4 100644
--- a/drivers/ide/pci/scc_pata.c
+++ b/drivers/ide/pci/scc_pata.c
@@ -284,27 +284,6 @@ static void scc_set_dma_mode(ide_drive_t *drive, const u8 speed)
 }
 
 /**
- *      scc_configure_drive_for_dma     -       set up for DMA transfers
- *      @drive: drive we are going to set up
- *
- *      Set up the drive for DMA, tune the controller and drive as
- *      required.
- *      If the drive isn't suitable for DMA or we hit other problems
- *      then we will drop down to PIO and set up PIO appropriately.
- *      (return -1)
- */
-
-static int scc_config_drive_for_dma(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/**
  *      scc_ide_dma_setup       -       begin a DMA phase
  *      @drive: target device
  *
@@ -701,7 +680,6 @@ static void __devinit init_hwif_scc(ide_hwif_t *hwif)
         hwif->ide_dma_end = scc_ide_dma_end;
         hwif->set_pio_mode = scc_set_pio_mode;
         hwif->set_dma_mode = scc_set_dma_mode;
-        hwif->ide_dma_check = scc_config_drive_for_dma;
         hwif->ide_dma_test_irq = scc_dma_test_irq;
         hwif->udma_filter = scc_udma_filter;
 
diff --git a/drivers/ide/pci/serverworks.c b/drivers/ide/pci/serverworks.c
index 4666e4c1597b..c0d82d290587 100644
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -196,16 +196,6 @@ static void svwks_set_dma_mode(ide_drive_t *drive, const u8 speed)
         pci_write_config_byte(dev, 0x54, ultra_enable);
 }
 
-static int svwks_config_drive_xfer_rate (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static unsigned int __devinit init_chipset_svwks (struct pci_dev *dev, const char *name)
 {
         unsigned int reg;
@@ -392,7 +382,6 @@ static void __devinit init_hwif_svwks (ide_hwif_t *hwif)
         if (!hwif->dma_base)
                 return;
 
-        hwif->ide_dma_check = &svwks_config_drive_xfer_rate;
         if (hwif->pci_dev->device != PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                         hwif->cbl = ata66_svwks(hwif);
diff --git a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
index c74fef6bbc91..210f32d1e93c 100644
--- a/drivers/ide/pci/sgiioc4.c
+++ b/drivers/ide/pci/sgiioc4.c
@@ -296,20 +296,6 @@ static void sgiioc4_set_dma_mode(ide_drive_t *drive, const u8 speed)
 {
 }
 
-static int sgiioc4_ide_dma_check(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        /*
-         * ->set_pio_mode is not implemented currently
-         * so this is just for the completness
-         */
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 /* returns 1 if dma irq issued, 0 otherwise */
 static int
 sgiioc4_ide_dma_test_irq(ide_drive_t * drive)
@@ -612,7 +598,6 @@ ide_init_sgiioc4(ide_hwif_t * hwif)
         hwif->dma_setup = &sgiioc4_ide_dma_setup;
         hwif->dma_start = &sgiioc4_ide_dma_start;
         hwif->ide_dma_end = &sgiioc4_ide_dma_end;
-        hwif->ide_dma_check = &sgiioc4_ide_dma_check;
         hwif->ide_dma_on = &sgiioc4_ide_dma_on;
         hwif->dma_off_quietly = &sgiioc4_dma_off_quietly;
         hwif->ide_dma_test_irq = &sgiioc4_ide_dma_test_irq;
diff --git a/drivers/ide/pci/siimage.c b/drivers/ide/pci/siimage.c
index 8be36f3b69a8..9e03bc7c8665 100644
--- a/drivers/ide/pci/siimage.c
+++ b/drivers/ide/pci/siimage.c
@@ -311,26 +311,6 @@ static void sil_set_dma_mode(ide_drive_t *drive, const u8 speed)
         }
 }
 
-/**
- *      siimage_configure_drive_for_dma -       set up for DMA transfers
- *      @drive: drive we are going to set up
- *
- *      Set up the drive for DMA, tune the controller and drive as 
- *      required. If the drive isn't suitable for DMA or we hit
- *      other problems then we will drop down to PIO and set up
- *      PIO appropriately
- */
- 
-static int siimage_config_drive_for_dma (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 /* returns 1 if dma irq issued, 0 otherwise */
 static int siimage_io_ide_dma_test_irq (ide_drive_t *drive)
 {
@@ -924,8 +904,6 @@ static void __devinit init_hwif_siimage(ide_hwif_t *hwif)
         if (!is_sata(hwif))
                 hwif->atapi_dma = 1;
 
-        hwif->ide_dma_check = &siimage_config_drive_for_dma;
-
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                 hwif->cbl = ata66_siimage(hwif);
 
diff --git a/drivers/ide/pci/sis5513.c b/drivers/ide/pci/sis5513.c
index 5458c56e69b0..45666b45231a 100644
--- a/drivers/ide/pci/sis5513.c
+++ b/drivers/ide/pci/sis5513.c
@@ -601,16 +601,6 @@ static void sis_set_dma_mode(ide_drive_t *drive, const u8 speed)
         }
 }
 
-static int sis5513_config_xfer_rate(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static u8 sis5513_ata133_udma_filter(ide_drive_t *drive)
 {
         struct pci_dev *dev = drive->hwif->pci_dev;
@@ -847,8 +837,6 @@ static void __devinit init_hwif_sis5513 (ide_hwif_t *hwif)
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                 hwif->cbl = ata66_sis5513(hwif);
 
-        hwif->ide_dma_check = &sis5513_config_xfer_rate;
-
         if (!noautodma)
                 hwif->autodma = 1;
 
diff --git a/drivers/ide/pci/sl82c105.c b/drivers/ide/pci/sl82c105.c
index 245eac05ab1b..c9090faf49bd 100644
--- a/drivers/ide/pci/sl82c105.c
+++ b/drivers/ide/pci/sl82c105.c
@@ -145,21 +145,6 @@ static void sl82c105_set_dma_mode(ide_drive_t *drive, const u8 speed)
 }
 
 /*
- * Check to see if the drive and chipset are capable of DMA mode.
- */
-static int sl82c105_ide_dma_check(ide_drive_t *drive)
-{
-        DBG(("sl82c105_ide_dma_check(drive:%s)\n", drive->name));
-
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/*
  * The SL82C105 holds off all IDE interrupts while in DMA mode until
  * all DMA activity is completed.  Sometimes this causes problems (eg,
  * when the drive wants to report an error condition).
@@ -406,7 +391,6 @@ static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
         hwif->atapi_dma  = 1;
         hwif->mwdma_mask = 0x07;
 
-        hwif->ide_dma_check             = &sl82c105_ide_dma_check;
         hwif->ide_dma_on                = &sl82c105_ide_dma_on;
         hwif->dma_off_quietly           = &sl82c105_dma_off_quietly;
         hwif->dma_lost_irq              = &sl82c105_dma_lost_irq;
diff --git a/drivers/ide/pci/slc90e66.c b/drivers/ide/pci/slc90e66.c
index 41c5c571f6bd..bf21f1dfb7b5 100644
--- a/drivers/ide/pci/slc90e66.c
+++ b/drivers/ide/pci/slc90e66.c
@@ -130,16 +130,6 @@ static void slc90e66_set_dma_mode(ide_drive_t *drive, const u8 speed)
         slc90e66_set_pio_mode(drive, pio);
 }
 
-static int slc90e66_config_drive_xfer_rate (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static void __devinit init_hwif_slc90e66 (ide_hwif_t *hwif)
 {
         u8 reg47 = 0;
@@ -170,8 +160,6 @@ static void __devinit init_hwif_slc90e66 (ide_hwif_t *hwif)
                 /* bit[0(1)]: 0:80, 1:40 */
                 hwif->cbl = (reg47 & mask) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
 
-        hwif->ide_dma_check = &slc90e66_config_drive_xfer_rate;
-
         if (!noautodma)
                 hwif->autodma = 1;
         hwif->drives[0].autodma = hwif->autodma;
diff --git a/drivers/ide/pci/tc86c001.c b/drivers/ide/pci/tc86c001.c
index e66e7883ebe2..7df57d4f7894 100644
--- a/drivers/ide/pci/tc86c001.c
+++ b/drivers/ide/pci/tc86c001.c
@@ -162,16 +162,6 @@ static int tc86c001_busproc(ide_drive_t *drive, int state)
         return 0;
 }
 
-static int tc86c001_config_drive_xfer_rate(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif)
 {
         unsigned long sc_base   = pci_resource_start(hwif->pci_dev, 5);
@@ -212,7 +202,6 @@ static void __devinit init_hwif_tc86c001(ide_hwif_t *hwif)
         hwif->ultra_mask = 0x1f;
         hwif->mwdma_mask = 0x07;
 
-        hwif->ide_dma_check     = &tc86c001_config_drive_xfer_rate;
         hwif->dma_start         = &tc86c001_dma_start;
 
         if (hwif->cbl != ATA_CBL_PATA40_SHORT) {
diff --git a/drivers/ide/pci/triflex.c b/drivers/ide/pci/triflex.c
index 54e411d4e56c..921c41006df9 100644
--- a/drivers/ide/pci/triflex.c
+++ b/drivers/ide/pci/triflex.c
@@ -96,16 +96,6 @@ static void triflex_set_pio_mode(ide_drive_t *drive, const u8 pio)
         triflex_set_mode(drive, XFER_PIO_0 + pio);
 }
 
-static int triflex_config_drive_xfer_rate(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static void __devinit init_hwif_triflex(ide_hwif_t *hwif)
 {
         hwif->set_pio_mode = &triflex_set_pio_mode;
@@ -117,7 +107,6 @@ static void __devinit init_hwif_triflex(ide_hwif_t *hwif)
         hwif->atapi_dma  = 1;
         hwif->mwdma_mask = 0x07;
         hwif->swdma_mask = 0x07;
-        hwif->ide_dma_check = &triflex_config_drive_xfer_rate;
         
         if (!noautodma)
                 hwif->autodma = 1;
diff --git a/drivers/ide/pci/trm290.c b/drivers/ide/pci/trm290.c
index dc4f4e298e00..f227a05420ee 100644
--- a/drivers/ide/pci/trm290.c
+++ b/drivers/ide/pci/trm290.c
@@ -329,6 +329,7 @@ static ide_pci_device_t trm290_chipset __devinitdata = {
         .init_hwif      = init_hwif_trm290,
         .autodma        = NOAUTODMA,
         .bootable       = ON_BOARD,
+        .host_flags     = IDE_HFLAG_TRUST_BIOS_FOR_DMA,
 };
 
 static int __devinit trm290_init_one(struct pci_dev *dev, const struct pci_device_id *id)
diff --git a/drivers/ide/pci/via82cxxx.c b/drivers/ide/pci/via82cxxx.c
index 479e49661032..c199f88c420f 100644
--- a/drivers/ide/pci/via82cxxx.c
+++ b/drivers/ide/pci/via82cxxx.c
@@ -197,24 +197,6 @@ static void via_set_pio_mode(ide_drive_t *drive, const u8 pio)
         via_set_drive(drive, XFER_PIO_0 + pio);
 }
 
-/**
- *      via82cxxx_ide_dma_check         -       set up for DMA if possible
- *      @drive: IDE drive to set up
- *
- *      Set up the drive for the highest supported speed considering the
- *      driver, controller and cable
- */
- 
-static int via82cxxx_ide_dma_check (ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
 static struct via_isa_bridge *via_config_find(struct pci_dev **isa)
 {
         struct via_isa_bridge *via_config;
@@ -473,7 +455,6 @@ static void __devinit init_hwif_via82cxxx(ide_hwif_t *hwif)
         if (hwif->cbl != ATA_CBL_PATA40_SHORT)
                 hwif->cbl = via82cxxx_cable_detect(hwif);
 
-        hwif->ide_dma_check = &via82cxxx_ide_dma_check;
         if (!noautodma)
                 hwif->autodma = 1;
         hwif->drives[0].autodma = hwif->autodma;
diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index e0859385732e..dac66b851085 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -1579,21 +1579,6 @@ pmac_ide_destroy_dmatable (ide_drive_t *drive)
 }
 
 /*
- * Check what is the best DMA timing setting for the drive and
- * call appropriate functions to apply it.
- */
-static int
-pmac_ide_dma_check(ide_drive_t *drive)
-{
-        if (ide_tune_dma(drive))
-                return 0;
-
-        ide_set_max_pio(drive);
-
-        return -1;
-}
-
-/*
  * Prepare a DMA transfer. We build the DMA table, adjust the timings for
  * a read on KeyLargo ATA/66 and mark us as waiting for DMA completion
  */
@@ -1790,7 +1775,6 @@ pmac_ide_setup_dma(pmac_ide_hwif_t *pmif, ide_hwif_t *hwif)
 
         hwif->dma_off_quietly = &ide_dma_off_quietly;
         hwif->ide_dma_on = &__ide_dma_on;
-        hwif->ide_dma_check = &pmac_ide_dma_check;
         hwif->dma_setup = &pmac_ide_dma_setup;
         hwif->dma_exec_cmd = &pmac_ide_dma_exec_cmd;
         hwif->dma_start = &pmac_ide_dma_start;