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-rw-r--r--Documentation/pci.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/pci.txt b/Documentation/pci.txt
index 7d3da30ff0b..7754f5aea4e 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,
call pci_set_mwi(). This enables the PCI_COMMAND bit for Mem-Wr-Inval
and also ensures that the cache line size register is set correctly.
Check the return value of pci_set_mwi() as not all architectures
-or chip-sets may support Memory-Write-Invalidate.
+or chip-sets may support Memory-Write-Invalidate. Alternatively,
+if Mem-Wr-Inval would be nice to have but is not required, call
+pci_try_set_mwi() to have the system do its best effort at enabling
+Mem-Wr-Inval.
3.2 Request MMIO/IOP resources