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Diffstat (limited to 'src/drivers/bus/pciextra.c')
| -rw-r--r-- | src/drivers/bus/pciextra.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/drivers/bus/pciextra.c b/src/drivers/bus/pciextra.c index 1dd63ee3..74c40990 100644 --- a/src/drivers/bus/pciextra.c +++ b/src/drivers/bus/pciextra.c @@ -60,8 +60,11 @@ int pci_find_capability ( struct pci_device *pci, int cap ) { * function. */ unsigned long pci_bar_size ( struct pci_device *pci, unsigned int reg ) { + uint16_t cmd; uint32_t start, size; + /* Save the original command register */ + pci_read_config_word ( pci, PCI_COMMAND, &cmd ); /* Save the original bar */ pci_read_config_dword ( pci, reg, &start ); /* Compute which bits can be set */ @@ -70,6 +73,8 @@ unsigned long pci_bar_size ( struct pci_device *pci, unsigned int reg ) { /* Restore the original size */ pci_write_config_dword ( pci, reg, start ); /* Find the significant bits */ + /* Restore the original command register. This reenables decoding. */ + pci_write_config_word ( pci, PCI_COMMAND, cmd ); if ( start & PCI_BASE_ADDRESS_SPACE_IO ) { size &= PCI_BASE_ADDRESS_IO_MASK; } else { |