diff options
Diffstat (limited to 'Documentation/pci.txt')
| -rw-r--r-- | Documentation/pci.txt | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/pci.txt b/Documentation/pci.txt index 7d3da30ff0b4..7754f5aea4e9 100644 --- a/Documentation/pci.txt +++ b/Documentation/pci.txt | |||
| @@ -296,7 +296,10 @@ If the PCI device can use the PCI Memory-Write-Invalidate transaction, | |||
| 296 | call pci_set_mwi(). This enables the PCI_COMMAND bit for Mem-Wr-Inval | 296 | call pci_set_mwi(). This enables the PCI_COMMAND bit for Mem-Wr-Inval |
| 297 | and also ensures that the cache line size register is set correctly. | 297 | and also ensures that the cache line size register is set correctly. |
| 298 | Check the return value of pci_set_mwi() as not all architectures | 298 | Check the return value of pci_set_mwi() as not all architectures |
| 299 | or chip-sets may support Memory-Write-Invalidate. | 299 | or chip-sets may support Memory-Write-Invalidate. Alternatively, |
| 300 | if Mem-Wr-Inval would be nice to have but is not required, call | ||
| 301 | pci_try_set_mwi() to have the system do its best effort at enabling | ||
| 302 | Mem-Wr-Inval. | ||
| 300 | 303 | ||
| 301 | 304 | ||
| 302 | 3.2 Request MMIO/IOP resources | 305 | 3.2 Request MMIO/IOP resources |