Hi Jacob,

On Thu, Mar 08, 2018 at 05:47:55PM +0800, Jacob Chen wrote:

+static int rkisp1_isp_sd_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct rkisp1_device *isp_dev = sd_to_isp_dev(sd);
+	int ret;
+
+	v4l2_dbg(1, rkisp1_debug, &isp_dev->v4l2_dev, "s_power: %d\n", on);
+
+	if (on) {
+		ret = pm_runtime_get_sync(isp_dev->dev);
+		if (ret < 0)
+			return ret;
+
+		rkisp1_config_clk(isp_dev);
+	} else {
+		ret = pm_runtime_put(isp_dev->dev);

I commented this line out to make more than one STREAMON work. Otherwise, the 
second STREAMON hangs. I guess the bug is not this driver. Probably something 
in drivers/soc/rockchip/pm_domains.c. Just noting that in case you or someone 
on Cc would like to investigate it further.

I tested v4.16-rc4 on the Tinkerboard.

baruch

+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}

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