diff options
| -rw-r--r-- | sys/dev/pci/pci.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c index bb90375c..9bf37bc 100644 --- a/sys/dev/pci/pci.c +++ b/sys/dev/pci/pci.c @@ -4576,6 +4576,7 @@ pci_reserve_map(device_t dev, device_t child, int type, int *rid, struct resource_list *rl = &dinfo->resources; struct resource *res; struct pci_map *pm; + uint16_t cmd; pci_addr_t map, testval; int mapsize; @@ -4660,8 +4661,17 @@ pci_reserve_map(device_t dev, device_t child, int type, int *rid, device_printf(child, "Lazy allocation of %#lx bytes rid %#x type %d at %#lx\n", count, *rid, type, rman_get_start(res)); + + /* Disable decoding via the CMD register before updating the BAR */ + cmd = pci_read_config(child, PCIR_COMMAND, 2); + pci_write_config(child, PCIR_COMMAND, + cmd & ~(PCI_BAR_MEM(map) ? PCIM_CMD_MEMEN : PCIM_CMD_PORTEN), 2); + map = rman_get_start(res); pci_write_bar(child, pm, map); + + /* Restore the original value of the CMD register */ + pci_write_config(child, PCIR_COMMAND, cmd, 2); out: return (res); } |
