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authorTejun Heo <htejun@gmail.com>2006-12-12 20:17:32 +0900
committerJeff Garzik <jeff@garzik.org>2006-12-16 10:13:29 -0500
commit551c012d7eea3dc5ec063c7ff9c718d39e77634f (patch)
tree244c89c1e0d6878a036fde806f080bf8885c661b /drivers/ata/ahci.c
parent33480a0ede8dcc7e6483054279008f972bd56fd3 (diff)
downloadop-kernel-dev-551c012d7eea3dc5ec063c7ff9c718d39e77634f.zip
op-kernel-dev-551c012d7eea3dc5ec063c7ff9c718d39e77634f.tar.gz
[PATCH] ahci: do not mangle saved HOST_CAP while resetting controller
Do not mangle with HOST_CAP while resetting controller. The code is there for a historical reason. The mangling breaks controller feature detection and 0 PORTS_IMPL workaround code. This problem was spotted by Manoj Kasichainula. Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Manoj Kasichainula <manoj@io.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata/ahci.c')
-rw-r--r--drivers/ata/ahci.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index f36da48..dbae6d9 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -645,8 +645,6 @@ static int ahci_reset_controller(void __iomem *mmio, struct pci_dev *pdev)
u32 cap_save, impl_save, tmp;
cap_save = readl(mmio + HOST_CAP);
- cap_save &= ( (1<<28) | (1<<17) );
- cap_save |= (1 << 27);
impl_save = readl(mmio + HOST_PORTS_IMPL);
/* global controller reset */
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