[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>
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@ -645,8 +645,6 @@ static int ahci_reset_controller(void __iomem *mmio, struct pci_dev *pdev)
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u32 cap_save, impl_save, tmp;
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cap_save = readl(mmio + HOST_CAP);
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cap_save &= ( (1<<28) | (1<<17) );
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cap_save |= (1 << 27);
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impl_save = readl(mmio + HOST_PORTS_IMPL);
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/* global controller reset */
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