From ed454f2cd61a54d00c267e385c0600bae0761833 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 21 Jul 2017 13:32:29 +0100
Subject: [PATCH] drm/i915: Clear engine irq posted following a reset
Git-commit: ed454f2cd61a54d00c267e385c0600bae0761833
Patch-mainline: v4.14-rc1
References: FATE#322643 bsc#1055900

When the GPU is reset, we want to discard all pending notifications as
either we have manually completed them, or they are no longer
applicable. Make sure we do reset the engine->irq_posted prior to
re-enabling the engine (e.g. the interrupt tasklets) in
i915_gem_reset_finish_engine().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170721123238.16428-11-chris@chris-wilson.co.uk
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/i915_gem.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2964,6 +2964,8 @@ static bool i915_gem_reset_request(struc
 void i915_gem_reset_engine(struct intel_engine_cs *engine,
 			   struct drm_i915_gem_request *request)
 {
+	engine->irq_posted = 0;
+
 	if (request && i915_gem_reset_request(request)) {
 		DRM_DEBUG_DRIVER("resetting %s to restart from tail of request 0x%x\n",
 				 engine->name, request->global_seqno);