Messages in this thread | | | Subject | Re: [RFC PATCH v6 6/9] media: tegra: Add Tegra210 Video input driver | From | Sowjanya Komatineni <> | Date | Mon, 6 Apr 2020 13:30:54 -0700 |
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On 4/6/20 1:28 PM, Dmitry Osipenko wrote: > External email: Use caution opening links or attachments > > > 06.04.2020 23:05, Sowjanya Komatineni пишет: > .. >>>> Wait time for HW syncpt to reach threshold is tuned to work for all >>>> frame rates. So if increment doesn't happen by then, its definitely >>>> missed event. >>> This is questionable. Technically, speculating about whether the tuned >>> value is good for all possible cases is incorrect thing to do. >>> >>> Although, I guess in practice it should be good enough for the starter >>> and could be improved later on, once the host1x driver will be improved. >> By tuned value I meant about 200ms wait timeout for frame event to >> happen is what we have been using in downstream and with BSP release >> images which works good for all sensors and bridges we supported so far. > I don't know anything about the state of today's downstream, but > downstream of older Tegra SoCs was pretty awful in regards to the host1x > syncing, unfortunately it was borrowed into the upstream host1x years > ago and nothing was done about it so far. I'd suggest to be careful > about it. 200ms timeout we wait for event to happen is the case even with T186/T194 as well and internally it was tuned from lots of testing with various sensors and frame rate computations which is known to work good.
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