agp: add chipset flushing support to AGP interface
This bumps the AGP interface to 0.103.
Certain Intel chipsets contains a global write buffer, and this can require
flushing from the drm or X.org to make sure all data has hit RAM before
initiating a GPU transfer, due to a lack of coherency with the integrated
graphics device and this buffer.
This just adds generic support to the AGP interfaces, a follow-on patch
will add support to the Intel driver to use this interface.
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index 1a4674c..7484bc7 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -80,6 +80,13 @@
return -1;
}
+void agp_flush_chipset(struct agp_bridge_data *bridge)
+{
+ if (bridge->driver->chipset_flush)
+ bridge->driver->chipset_flush(bridge);
+}
+EXPORT_SYMBOL(agp_flush_chipset);
+
/*
* Use kmalloc if possible for the page list. Otherwise fall back to
* vmalloc. This speeds things up and also saves memory for small AGP