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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-11-19 22:31:31 +0300
committerJeff Garzik <jgarzik@redhat.com>2009-12-03 10:46:35 +0300
commit10a9c969222de5302cff0bb41dd7f114f9aa8e5d (patch)
tree27f9feaf8ab5b255d384c5bf1734c0458a68f25d /drivers/ata/pata_hpt3x2n.c
parentf3b1cf40d4012351d793793b2965aca57cc9fdd5 (diff)
downloadlinux-10a9c969222de5302cff0bb41dd7f114f9aa8e5d.tar.xz
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>
Diffstat (limited to 'drivers/ata/pata_hpt3x2n.c')
-rw-r--r--drivers/ata/pata_hpt3x2n.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/ata/pata_hpt3x2n.c b/drivers/ata/pata_hpt3x2n.c
index 2ab9fd6c597f..8d63eba782ff 100644
--- a/drivers/ata/pata_hpt3x2n.c
+++ b/drivers/ata/pata_hpt3x2n.c
@@ -128,6 +128,9 @@ static int hpt3x2n_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 */