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pata_cypress: fix PIO timings underclocking 

Timing registers should be programmed with the desired number of clocks
minus one clock.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2010-01-18 18:15:47 +01:00 committed by Jeff Garzik
parent 8ebf473860
commit 3403c24529
1 changed files with 6 additions and 4 deletions
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10
drivers/ata/pata_cypress.c
View File

@ -62,14 +62,16 @@ static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
return;
}
time_16 = clamp_val(t.recover, 0, 15) | (clamp_val(t.active, 0, 15) << 4);
time_8 = clamp_val(t.act8b, 0, 15) | (clamp_val(t.rec8b, 0, 15) << 4);
time_16 = clamp_val(t.recover - 1, 0, 15) |
(clamp_val(t.active - 1, 0, 15) << 4);
time_8 = clamp_val(t.act8b - 1, 0, 15) |
(clamp_val(t.rec8b - 1, 0, 15) << 4);
if (adev->devno == 0) {
pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
addr &= ~0x0F; /* Mask bits */
addr |= clamp_val(t.setup, 0, 15);
addr |= clamp_val(t.setup - 1, 0, 15);
pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
pci_write_config_byte(pdev, CY82_IDE_MASTER_IOR, time_16);
@ -79,7 +81,7 @@ static void cy82c693_set_piomode(struct ata_port *ap, struct ata_device *adev)
pci_read_config_dword(pdev, CY82_IDE_ADDRSETUP, &addr);
addr &= ~0xF0; /* Mask bits */
addr |= (clamp_val(t.setup, 0, 15) << 4);
addr |= (clamp_val(t.setup - 1, 0, 15) << 4);
pci_write_config_dword(pdev, CY82_IDE_ADDRSETUP, addr);
pci_write_config_byte(pdev, CY82_IDE_SLAVE_IOR, time_16);