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sb/intel/bd82x6x: Disable unused bridges 

Disable unused bridges that are not marked as hot-plugable.
Reduces idle power consumtion by ~200mWatt for each port.

Tested on Lenovo T430.

Change-Id: I6ee5e5f33824acdbca0f6ed28e90beab7fe10002
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/19818
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
This commit is contained in:
Patrick Rudolph 2017-05-22 19:06:28 +02:00 committed by Martin Roth
parent a6909f88e9
commit f4835a85c0
1 changed files with 14 additions and 0 deletions
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14
src/southbridge/intel/bd82x6x/pcie.c
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@ -269,6 +269,14 @@ static void pch_pcie_enable(device_t dev)
pch_pcie_pm_early(dev);
}
static void pch_pcie_disable(device_t dev)
{
dev->enabled = 0;
/* Let PCH hide the device */
pch_enable(dev);
}
static void pch_pciexp_scan_bridge(device_t dev)
{
struct southbridge_intel_bd82x6x_config *config = dev->chip_info;
@ -278,6 +286,11 @@ static void pch_pciexp_scan_bridge(device_t dev)
if (config->pcie_hotplug_map[PCI_FUNC(dev->path.pci.devfn)]) {
intel_acpi_pcie_hotplug_scan_slot(dev->link_list);
} else {
if (!dev_is_active_bridge(dev)) {
dev->ops->disable(dev);
return;
}
}
/* Late Power Management init after bridge device enumeration */
@ -305,6 +318,7 @@ static struct device_operations device_ops = {
.set_resources = pci_dev_set_resources,
.enable_resources = pci_bus_enable_resources,
.init = pci_init,
.disable = pch_pcie_disable,
.enable = pch_pcie_enable,
.scan_bus = pch_pciexp_scan_bridge,
.ops_pci = &pci_ops,