diff options
| author | Patrick Rudolph <siro@das-labor.org> | 2015-12-28 12:59:47 +0100 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-02-04 01:44:40 +0100 |
| commit | 0e06f5bd70b45fd330d8dfb1dc77cce043caf841 (patch) | |
| tree | 05ab7ad973378360c541da424b48eb64c16ef06e /src/northbridge/intel/sandybridge | |
| parent | a1c3beddbb197b3b8b92c7e236f72fd4425518ce (diff) | |
northbridge/intel/peg: Disable unused ports
Walk the bus and try to find enabled devices.
Disable the PEG port if no devices are attached.
Change-Id: I67fcc831fd78ecc6dba83f4e0662ec7549cc2591
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/12894
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/northbridge/intel/sandybridge')
| -rw-r--r-- | src/northbridge/intel/sandybridge/northbridge.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/src/northbridge/intel/sandybridge/northbridge.c b/src/northbridge/intel/sandybridge/northbridge.c index 53d93a2501..3974fe895c 100644 --- a/src/northbridge/intel/sandybridge/northbridge.c +++ b/src/northbridge/intel/sandybridge/northbridge.c @@ -368,6 +368,17 @@ static void northbridge_dmi_init(struct device *dev) DMIBAR32(0x88) = reg32; } +static u8 scan_bus_unused(struct bus *link) +{ + struct device *dev; + + for (dev = link->children; dev; dev = dev->sibling) { + if (dev->enabled) + return 0; + } + return 1; +} + /* Disable unused PEG devices based on devicetree */ static void disable_peg(void) { @@ -378,27 +389,32 @@ static void disable_peg(void) reg = pci_read_config32(dev, DEVEN); dev = dev_find_slot(0, PCI_DEVFN(1, 2)); - if (!dev || !dev->enabled) { + if (!dev || !dev->enabled || + (dev->link_list && scan_bus_unused(dev->link_list))) { printk(BIOS_DEBUG, "Disabling PEG12.\n"); reg &= ~DEVEN_PEG12; } dev = dev_find_slot(0, PCI_DEVFN(1, 1)); - if (!dev || !dev->enabled) { + if (!dev || !dev->enabled || + (dev->link_list && scan_bus_unused(dev->link_list))) { printk(BIOS_DEBUG, "Disabling PEG11.\n"); reg &= ~DEVEN_PEG11; } dev = dev_find_slot(0, PCI_DEVFN(1, 0)); - if (!dev || !dev->enabled) { + if (!dev || !dev->enabled || + (dev->link_list && scan_bus_unused(dev->link_list))) { printk(BIOS_DEBUG, "Disabling PEG10.\n"); reg &= ~DEVEN_PEG10; } dev = dev_find_slot(0, PCI_DEVFN(2, 0)); - if (!dev || !dev->enabled) { + if (!dev || !dev->enabled || + (dev->link_list && scan_bus_unused(dev->link_list))) { printk(BIOS_DEBUG, "Disabling IGD.\n"); reg &= ~DEVEN_IGD; } dev = dev_find_slot(0, PCI_DEVFN(6, 0)); - if (!dev || !dev->enabled) { + if (!dev || !dev->enabled || + (dev->link_list && scan_bus_unused(dev->link_list))) { printk(BIOS_DEBUG, "Disabling PEG60.\n"); reg &= ~DEVEN_PEG60; } |