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authorYinghai Lu <yinghai@kernel.org>2012-02-10 15:33:46 -0800
committerJesse Barnes <jbarnes@virtuousgeek.org>2012-02-23 11:59:45 -0800
commitdcef0d06b34a80071da4496556e85f9bf3b3c0bf (patch)
tree0801a6c7dbbcc2ac3ba05b59e506ebf6cc5d3df7 /drivers/pci/setup-bus.c
parent5b415f1e79e0c09366f26e3eabe751642059285a (diff)
PCI: Disable cardbus bridge MEM1 prefetchable bit
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: Yinghai Lu <yinghai@kernel.org> Tested-by: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/setup-bus.c')
-rw-r--r--drivers/pci/setup-bus.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 090217afb4e1..d5897c32f669 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -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.