drm/i915/gt: Increase suspend timeout

With GuC submission on DG1, the execution of the requests times out
for the gem_exec_suspend igt test case after executing around 800-900
of 1000 submitted requests.

Given the time we allow elsewhere for fences to signal (in the order of
seconds), increase the timeout before we mark the gt wedged and proceed.
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Acked-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210922062527.865433-4-thomas.hellstrom@linux.intel.com

drivers/gpu/drm/i915/gt/intel_gt_pm.c

@@ -19,6 +19,8 @@
 #include "intel_rps.h"
 #include "intel_wakeref.h"
 
+#define I915_GT_SUSPEND_IDLE_TIMEOUT (HZ / 2)
+
 static void user_forcewake(struct intel_gt *gt, bool suspend)
 {
 	int count = atomic_read(&gt->user_wakeref);
@@ -279,7 +281,7 @@ static void wait_for_suspend(struct intel_gt *gt)
 	if (!intel_gt_pm_is_awake(gt))
 		return;
 
-	if (intel_gt_wait_for_idle(gt, I915_GEM_IDLE_TIMEOUT) == -ETIME) {
+	if (intel_gt_wait_for_idle(gt, I915_GT_SUSPEND_IDLE_TIMEOUT) == -ETIME) {
 		/*
 		 * Forcibly cancel outstanding work and leave
 		 * the gpu quiet.