pata_hpt{37x,3x2n}: add debounce delay to cable detection methods

Alan Cox reported that cable detection sometimes works unreliably
for HPT3xxN and that the issue is fixed by adding debounce delay
as used by the vendor driver.

Sergei Shtylyov also noticed that debounce delay is needed for all
HPT37x and HPT3xxN chipsets according to vendor drivers.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/ata/pata_hpt37x.c b/drivers/ata/pata_hpt37x.c
index 0921e8b30a08..9f5189c700bb 100644
--- a/drivers/ata/pata_hpt37x.c
+++ b/drivers/ata/pata_hpt37x.c
@@ -316,6 +316,9 @@ static int hpt37x_cable_detect(struct ata_port *ap)
 
         pci_read_config_byte(pdev, 0x5B, &scr2);
         pci_write_config_byte(pdev, 0x5B, scr2 & ~0x01);
+
+        udelay(10); /* debounce */
+
         /* Cable register now active */
         pci_read_config_byte(pdev, 0x5A, &ata66);
         /* Restore state */