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authorSergei Shtylyov <sshtylyov@ru.mvista.com>2010-09-27 11:00:40 -0700
committerDavid S. Miller <davem@davemloft.net>2010-10-26 10:17:29 -0700
commit5d3f1a493e19f34ba427936b76f0b5624a2fc62a (patch)
treeef5dc2f973f4b8ed5450c7be1a748a51d28394bc /drivers/ide
parentb18cae4224bde7e5a332c19bc99247b2098ea232 (diff)
downloadop-kernel-dev-5d3f1a493e19f34ba427936b76f0b5624a2fc62a.zip
op-kernel-dev-5d3f1a493e19f34ba427936b76f0b5624a2fc62a.tar.gz
hpt366: add debounce delay to cable_detect() method
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 drivers. While at it, get rid of unneeded parens/space in the vicinity... Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ide')
-rw-r--r--drivers/ide/hpt366.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/ide/hpt366.c b/drivers/ide/hpt366.c
index 97d98fb..c613ae1 100644
--- a/drivers/ide/hpt366.c
+++ b/drivers/ide/hpt366.c
@@ -1173,8 +1173,9 @@ static u8 hpt3xx_cable_detect(ide_hwif_t *hwif)
u16 mcr;
pci_read_config_word(dev, mcr_addr, &mcr);
- pci_write_config_word(dev, mcr_addr, (mcr | 0x8000));
- /* now read cable id register */
+ pci_write_config_word(dev, mcr_addr, mcr | 0x8000);
+ /* Debounce, then read cable ID register */
+ udelay(10);
pci_read_config_byte(dev, 0x5a, &scr1);
pci_write_config_word(dev, mcr_addr, mcr);
} else if (chip_type >= HPT370) {
@@ -1185,10 +1186,11 @@ static u8 hpt3xx_cable_detect(ide_hwif_t *hwif)
u8 scr2 = 0;
pci_read_config_byte(dev, 0x5b, &scr2);
- pci_write_config_byte(dev, 0x5b, (scr2 & ~1));
- /* now read cable id register */
+ pci_write_config_byte(dev, 0x5b, scr2 & ~1);
+ /* Debounce, then read cable ID register */
+ udelay(10);
pci_read_config_byte(dev, 0x5a, &scr1);
- pci_write_config_byte(dev, 0x5b, scr2);
+ pci_write_config_byte(dev, 0x5b, scr2);
} else
pci_read_config_byte(dev, 0x5a, &scr1);
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