workaround for CR-1141322 (#7088) (#7092)

Signed-off-by: Min Ma <min.ma@amd.com>

Signed-off-by: Min Ma <min.ma@amd.com>
Co-authored-by: Min Ma <min.ma@amd.com>
(cherry picked from commit 763797f)

Co-authored-by: Min Ma <min.ma@xilinx.com>

src/runtime_src/core/common/drv/include/xrt_cu.h

@@ -367,7 +367,8 @@ struct xrt_cu {
 	struct timer_list	  timer;
 	atomic_t		  tick;
 	u32			  start_tick;
-
+	u32			  force_intr;
+
 	struct xrt_cu_stats        stats;
 	/**
 	 * @funcs:

src/runtime_src/core/common/drv/xrt_cu.c

@@ -385,7 +385,7 @@ static inline int process_rq(struct xrt_cu *xcu)
 	xrt_cu_start(xcu);
 	if (xcu->thread) {
 		xcu->poll_count = 0;
-		if (xcu->interrupt_used)
+		if (!xcu->force_intr && xcu->interrupt_used)
 			xrt_cu_switch_to_poll(xcu);
 	}
 	set_xcmd_timestamp(xcmd, KDS_RUNNING);
@@ -551,6 +551,8 @@ int xrt_cu_intr_thread(void *data)
 	xcu->interrupt_used = 0;
 	xcu_info(xcu, "CU[%d] start", xcu->info.cu_idx);
 	mod_timer(&xcu->timer, jiffies + CU_TIMER);
+	if (xcu->force_intr)
+		xrt_cu_switch_to_interrupt(xcu);
 	while (!xcu->stop) {
 		/* Make sure to submit as many commands as possible.
 		 * This is why we call continue here. This is important to make

src/runtime_src/core/edge/drm/zocl/cu.c

@@ -431,6 +431,8 @@ static int cu_probe(struct platform_device *pdev)
 
 	zcu->base.user_manage_irq = user_manage_irq;
 	zcu->base.configure_irq = configure_irq;
+	/* This is a workaround for DPU kernel */
+	zcu->base.force_intr = 1;
 
 	zocl_info(&pdev->dev, "CU[%d] created", info->inst_idx);
 	return 0;