Hi Laurent, On Thu, Feb 08, 2018 at 08:17:19PM +0200, Laurent Pinchart wrote: > > + /* > > + * Create a static mapping between the CSI virtual channels > > + * and the output stream. > > + * > > + * This should be enhanced, but v4l2 lacks the support for > > + * changing that mapping dynamically. > > + * > > + * We also cannot enable and disable independant streams here, > > + * hence the reference counting. > > + */ > > If you start all streams in one go, will s_stream(1) be called multiple times > ? If not, you could possibly skip the whole reference counting and avoid > locking.
I guess that while we should expect the CSI-2 bus to be always enabled, the downstream camera interface could be shutdown independently, so I guess s_stream would be called each time one is brought up or brought down? Maxime -- Maxime Ripard, Bootlin (formerly Free Electrons) Embedded Linux and Kernel engineering http://bootlin.com
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