Hi Baruch,

On Thu, May 3, 2018 at 6:09 PM Baruch Siach [off-list ref] wrote:

Hi Jacob,

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

quoted

+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);

quoted

+
+     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.

Looks like that version doesn't include the IOMMU PM and clock handling
rework [1], which should fix a lot of runtime PM issues. FWIW, linux-next
seems to already include it.

[1] https://lkml.org/lkml/2018/3/23/44

Best regards,
Tomasz