PCI: Disable cardbus bridge MEM1 prefetchable bit (dcef0d06) · Commits · 戴 / test

Some BIOSes enable prefetch on both MEM0 and MEM1. But the cardbus code assumes MEM1 is non-pref... Discussion could be found at: https://lkml.org/lkml/2012/1/12/1 https://bugzilla.kernel.org/show_bug.cgi?id=41622#c23 Signed-off-by:

drivers/pci/setup-bus.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -914,6 +914,14 @@ static void pci_bus_size_cardbus(struct pci_bus *bus,
		if (realloc_head)
		add_to_list(realloc_head, bridge, b_res+1, pci_cardbus_io_size, 0 /* dont care */);

		/* MEM1 must not be pref mmio */
		pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
		if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM1) {
		ctrl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
		pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
		pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
		}

		/*
		* Check whether prefetchable memory is supported
		* by this bridge.