Commit 551c012d authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik

[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: default avatarTejun Heo <htejun@gmail.com>
Cc: Manoj Kasichainula <manoj@io.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 33480a0e
...@@ -645,8 +645,6 @@ static int ahci_reset_controller(void __iomem *mmio, struct pci_dev *pdev) ...@@ -645,8 +645,6 @@ static int ahci_reset_controller(void __iomem *mmio, struct pci_dev *pdev)
u32 cap_save, impl_save, tmp; u32 cap_save, impl_save, tmp;
cap_save = readl(mmio + HOST_CAP); cap_save = readl(mmio + HOST_CAP);
cap_save &= ( (1<<28) | (1<<17) );
cap_save |= (1 << 27);
impl_save = readl(mmio + HOST_PORTS_IMPL); impl_save = readl(mmio + HOST_PORTS_IMPL);
/* global controller reset */ /* global controller reset */
......
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