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pata_efar: fix wrong MWDMA timings being programmed 

Do not clear MWDMA timings for device on the other port when
programming slave device.

This change should be safe as this is how we have been doing
things in IDE slc90e66 host driver for years.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2009-12-03 20:32:08 +01:00 committed by Jeff Garzik
parent f79ff92649
commit dd221f9ce9
1 changed files with 1 additions and 1 deletions
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2
drivers/ata/pata_efar.c
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@ -201,7 +201,7 @@ static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
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);