From 5d3f1a493e19f34ba427936b76f0b5624a2fc62a Mon Sep 17 00:00:00 2001 From: Sergei Shtylyov Date: Mon, 27 Sep 2010 11:00:40 -0700 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- drivers/ide/hpt366.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/ide/hpt366.c b/drivers/ide/hpt366.c index 97d98fbf5849..c613ae170a84 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);