Hi Stephen and Thierry, Recently I'm working on upstreaming my V4L2 driver for Tegra video input module, which is using host1x syncpt to wait for frame capturing. So here is my basic steps for handling host1x syncpt, 1. Call host1x_syncpt_request(cam->client.dev, flags); to allocate syncpts for my driver. 2. Program host1x_syncpt_id(sp) into Tegra VI syncpt event register. So when VI captures one frame, syncpt will be increased one. 3. Call thresh = host1x_syncpt_incr_max(sp, 1) to incr max_val of the syncpt, which is the threshold for waiting. 4. Start capture and wait for host1x syncpt event like this host1x_syncpt_wait(sp, thresh, WAIT_TIMEOUT, &value); Is that the right sequence? host1x_syncpt_incr_max() is not exported and without calling it I always got error message like this: "tegra-host1x 50000000.host1x: syncpt_load failed: id=1, min=46, max=0, live=46" So I have to increase the max_val manually like step 3. And host1x_syncpt_incr() won't increase the max_val which will still generate this error message. Actually with the steps I listed, I can capture data from real sensor now. Thanks, -Bryan -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
