On Tue, Jan 24, 2017 at 07:51:28PM +0000, Mario.Limonciello@xxxxxxxx wrote: > Hi, > > Recently Synaptics collaborated with Dell on a plugin [1] for fwupd that allows flashing Synaptics MST hubs using the DP aux interface to manipulate the DPCD [2]. > Currently the plugin hardcodes the max number of DP aux devices to look for to 3 (as that's what we've seen so far on HW), but we were wondering: > > 1) If there is a way to query the number of devices that the kernel is going to be creating? > 2) Are there any instances of more than 3 devices in the wild today that anyone is aware of? These depend on the board you're dealing with, and on the number of gpus you have in the system (and whether they actually have drivers loaded for them). We should also perhaps expose the aux device node for MST devices. At which point the number of aux nodes could change dynamically when you plug MST devices in/out. So I don't think you should be making any assumptions on the number/order of these device nodes. > > [1] https://github.com/hughsie/fwupd/tree/master/plugins/synapticsmst > [2] https://github.com/torvalds/linux/commit/e94cb37b34eb8a88fe847438dba55c3f18bf024a > > Thanks, > > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Ville Syrjälä Intel OTC _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
