Ping, -Bryan On Thu, Feb 6, 2014 at 6:11 PM, Bryan Wu <cooloney@xxxxxxxxx> wrote: > Hi Terje, > > Forget to add you to this email, could you please help to take a look > at my questions? > > Thanks, > -Bryan > > On Tue, Feb 4, 2014 at 3:51 PM, Bryan Wu <cooloney@xxxxxxxxx> wrote: >> 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
