agp/intel: Flush chipset writes after updating a single PTE

After we update one PTE for a page, the caller expects to be able to
immediately use that through a GGTT read/write. To comply with the
callers expectations we therefore need to flush the chipset buffers
before returning.

Reported-by: Matti Hämäläinen <[email protected]>
Fixes: d6473f5 ("drm/i915: Add support for mapping an object page...")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Ankitprasad Sharma <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Tested-by: Matti Hämäläinen <[email protected]>
Cc: [email protected]
Reviewed-by: Mika Kuoppala <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

drivers/char/agp/intel-gtt.c

@@ -845,6 +845,8 @@ void intel_gtt_insert_page(dma_addr_t addr,
 			   unsigned int flags)
 {
 	intel_private.driver->write_entry(addr, pg, flags);
+	if (intel_private.driver->chipset_flush)
+		intel_private.driver->chipset_flush();
 }
 EXPORT_SYMBOL(intel_gtt_insert_page);