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[PATCH] ahci: do not mangle saved HOST_CAP while resetting controller

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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>
This commit is contained in:
Tejun Heo 2006-12-12 20:17:32 +09:00 committed by Jeff Garzik
parent 33480a0ede
commit 551c012d7e
1 changed files with 0 additions and 2 deletions
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2
drivers/ata/ahci.c
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@ -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 */