bounce: allow use of bounce pool via config option

The tilegx USB OHCI support needs the bounce pool since we're not
using the IOMMU to handle 32-bit addresses.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index cf4bb69ea8e5..932e4430f7f3 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -406,6 +406,12 @@ config TILE_USB
           Provides USB host adapter support for the built-in EHCI and OHCI
           interfaces on TILE-Gx chips.
 
+# USB OHCI needs the bounce pool since tilegx will often have more
+# than 4GB of memory, but we don't currently use the IOTLB to present
+# a 32-bit address to OHCI.  So we need to use a bounce pool instead.
+config NEED_BOUNCE_POOL
+        def_bool USB_OHCI_HCD
+
 config HOTPLUG
         bool "Support for hot-pluggable devices"
         ---help---