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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/gpu/drm/nouveau/nvkm/subdev/timer/base.c
..
..
@@ -23,6 +23,42 @@
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  */
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 #include "priv.h"
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+s64
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+nvkm_timer_wait_test(struct nvkm_timer_wait *wait)
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+{
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+	struct nvkm_subdev *subdev = &wait->tmr->subdev;
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+	u64 time = nvkm_timer_read(wait->tmr);
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+
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+	if (wait->reads == 0) {
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+		wait->time0 = time;
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+		wait->time1 = time;
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+	}
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+
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+	if (wait->time1 == time) {
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+		if (wait->reads++ == 16) {
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+			nvkm_fatal(subdev, "stalled at %016llx\n", time);
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+			return -ETIMEDOUT;
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+		}
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+	} else {
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+		wait->time1 = time;
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+		wait->reads = 1;
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+	}
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+
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+	if (wait->time1 - wait->time0 > wait->limit)
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+		return -ETIMEDOUT;
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+
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+	return wait->time1 - wait->time0;
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+}
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+
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+void
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+nvkm_timer_wait_init(struct nvkm_device *device, u64 nsec,
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+		     struct nvkm_timer_wait *wait)
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+{
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+	wait->tmr = device->timer;
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+	wait->limit = nsec;
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+	wait->reads = 0;
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+}
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+
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 u64
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 nvkm_timer_read(struct nvkm_timer *tmr)
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 {