linux: add upstream patch

Signed-off-by: Stephan Raue <stephan@openelec.tv>

packages/linux/patches/3.17.2/linux-999.10-drm_intel_gen7-stall.patch

@@ -0,0 +1,25 @@
+From dd604c15ffcdba52a5b6ac1bbc1c385bdcf7af6c Mon Sep 17 00:00:00 2001
+From: Chris Wilson <chris@chris-wilson.co.uk>
+Date: Fri, 14 Nov 2014 11:02:41 +0000
+Subject: [PATCH] gen7-stall
+
+Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
+---
+ drivers/gpu/drm/i915/intel_ringbuffer.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
+index ae09258..b39d1e4 100644
+--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
++++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
+@@ -367,6 +367,7 @@ gen7_render_ring_flush(struct intel_engine_cs *ring,
+ 		 */
+ 		flags |= PIPE_CONTROL_QW_WRITE;
+ 		flags |= PIPE_CONTROL_GLOBAL_GTT_IVB;
++		flags |= PIPE_CONTROL_STALL_AT_SCOREBOARD;
+ 
+ 		/* Workaround: we must issue a pipe_control with CS-stall bit
+ 		 * set before a pipe_control command that has the state cache
+-- 
+1.9.1
+