diff options
| -rw-r--r-- | drivers/ata/ata_piix.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c index 9c07b88631b..924e4474068 100644 --- a/drivers/ata/ata_piix.c +++ b/drivers/ata/ata_piix.c @@ -685,8 +685,14 @@ static void piix_set_piomode (struct ata_port *ap, struct ata_device *adev) if (adev->class == ATA_DEV_ATA) control |= 4; /* PPE enable */ + /* PIO configuration clears DTE unconditionally. It will be + * programmed in set_dmamode which is guaranteed to be called + * after set_piomode if any DMA mode is available. + */ pci_read_config_word(dev, master_port, &master_data); if (is_slave) { + /* clear TIME1|IE1|PPE1|DTE1 */ + master_data &= 0xff0f; /* Enable SITRE (seperate slave timing register) */ master_data |= 0x4000; /* enable PPE1, IE1 and TIME1 as needed */ @@ -694,12 +700,14 @@ static void piix_set_piomode (struct ata_port *ap, struct ata_device *adev) pci_read_config_byte(dev, slave_port, &slave_data); slave_data &= (ap->port_no ? 0x0f : 0xf0); /* Load the timing nibble for this slave */ - slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0); + slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) + << (ap->port_no ? 4 : 0); } else { - /* Master keeps the bits in a different format */ - master_data &= 0xccf8; + /* clear ISP|RCT|TIME0|IE0|PPE0|DTE0 */ + master_data &= 0xccf0; /* Enable PPE, IE and TIME as appropriate */ master_data |= control; + /* load ISP and RCT */ master_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8); @@ -816,7 +824,7 @@ static void do_pata_set_dmamode (struct ata_port *ap, struct ata_device *adev, i master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */ master_data |= control << 4; pci_read_config_byte(dev, 0x44, &slave_data); - slave_data &= (0x0F + 0xE1 * ap->port_no); + slave_data &= (ap->port_no ? 0x0f : 0xf0); /* Load the matching timing */ slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0); pci_write_config_byte(dev, 0x44, slave_data); @@ -828,8 +836,11 @@ static void do_pata_set_dmamode (struct ata_port *ap, struct ata_device *adev, i (timings[pio][0] << 12) | (timings[pio][1] << 8); } - udma_enable &= ~(1 << devid); - pci_write_config_word(dev, master_port, master_data); + + if (ap->udma_mask) { + udma_enable &= ~(1 << devid); + pci_write_config_word(dev, master_port, master_data); + } } /* Don't scribble on 0x48 if the controller does not support UDMA */ if (ap->udma_mask) |