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Revert "northbridge/intel/peg: Disable unused ports"

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This reverts commit 0e06f5bd70b45fd330d8dfb1dc77cce043caf841.

It breaks gm45 and also does some magic without being asked too. It
disables bridge devices permanently if no device was found on the se-
condary bus. In a simple notebook world this might be ok, but it breaks
hot-plugging and late detection (if a secondary bus device comes up too
slow for the firmware to detect and the OS has to enumerate it).

Change-Id: Ia2010640d7c55b0bdd44164b81c75dd4be50410b
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/13609
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
This commit is contained in:
Nico Huber 2016-02-04 18:59:48 +01:00 committed by Martin Roth
parent b27c24f69b
commit 2dc15e9ea8
2 changed files with 6 additions and 34 deletions
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14
src/northbridge/intel/gm45/northbridge.c
View File

@ -243,17 +243,6 @@ static void enable_dev(device_t dev)
}
}
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;
}
static void gm45_init(void *const chip_info)
{
int dev, fn, bit_base;
@ -279,8 +268,7 @@ static void gm45_init(void *const chip_info)
for (; fn >= 0; --fn) {
const struct device *const d =
dev_find_slot(0, PCI_DEVFN(dev, fn));
if (d && d->enabled && d->link_list && !scan_bus_unused(d->link_list))
continue;
if (!d || d->enabled) continue;
const u32 deven = pci_read_config32(d0f0, D0F0_DEVEN);
pci_write_config32(d0f0, D0F0_DEVEN,
deven & ~(1 << (bit_base + fn)));

26
src/northbridge/intel/sandybridge/northbridge.c
View File

@ -368,17 +368,6 @@ 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)
{
@ -389,32 +378,27 @@ static void disable_peg(void)
reg = pci_read_config32(dev, DEVEN);
dev = dev_find_slot(0, PCI_DEVFN(1, 2));
if (!dev || !dev->enabled ||
(dev->link_list && scan_bus_unused(dev->link_list))) {
if (!dev || !dev->enabled) {
printk(BIOS_DEBUG, "Disabling PEG12.\n");
reg &= ~DEVEN_PEG12;
}
dev = dev_find_slot(0, PCI_DEVFN(1, 1));
if (!dev || !dev->enabled ||
(dev->link_list && scan_bus_unused(dev->link_list))) {
if (!dev || !dev->enabled) {
printk(BIOS_DEBUG, "Disabling PEG11.\n");
reg &= ~DEVEN_PEG11;
}
dev = dev_find_slot(0, PCI_DEVFN(1, 0));
if (!dev || !dev->enabled ||
(dev->link_list && scan_bus_unused(dev->link_list))) {
if (!dev || !dev->enabled) {
printk(BIOS_DEBUG, "Disabling PEG10.\n");
reg &= ~DEVEN_PEG10;
}
dev = dev_find_slot(0, PCI_DEVFN(2, 0));
if (!dev || !dev->enabled ||
(dev->link_list && scan_bus_unused(dev->link_list))) {
if (!dev || !dev->enabled) {
printk(BIOS_DEBUG, "Disabling IGD.\n");
reg &= ~DEVEN_IGD;
}
dev = dev_find_slot(0, PCI_DEVFN(6, 0));
if (!dev || !dev->enabled ||
(dev->link_list && scan_bus_unused(dev->link_list))) {
if (!dev || !dev->enabled) {
printk(BIOS_DEBUG, "Disabling PEG60.\n");
reg &= ~DEVEN_PEG60;
}