Hi, On Thu, Oct 10, 2019 at 05:51:23PM +0000, Ajay Gupta wrote: > Hi Heikki, > > > > > > Hi Ajay, > > > > > > > > > > Here's the pretty much complete rewrite of the I/O handling that I > > > > > was talking about. The first seven patches are not actually > > > > > related to this stuff, but I'm including them here because the > > > > > rest of the series is made on top of them. I'm including also that > > > > > fix patch I send you earlier. > > > > > > > > > > After this it should be easier to handle quirks. My idea how to > > > > > handle the multi-instance connector alt modes is that we "emulate" > > > > > the PPM in ucsi_ccg.c in order to handle them, so ucsi.c is not > > > > > touched at > > > all. > > > > > > > > > > We can now get the connector alternate modes that the actual > > > > > controller supplies during probe - before registering the ucsi > > > > > interface > > > > How can ucsi_ccg.c get the connector alternate modes before > > > > registering ucsi interface? PPM reset, notification enable, etc. > > > > is done during ucsi registration. UCSI spec says: > > > > " The only commands the PPM is required to process in the "PPM Idle > > > > (Notifications Disabled)" state are SET_NOTIFICATION_ENABLE and > > > > PPM_RESE" > > > > > > > > Also, it doesn't look correct if ucsi_ccg.c has to replicate most of > > > > the stuff done in ucsi_init() of ucsi.c. > > > > > > How about if we split ucsi_init() into a function that first simply > > > constructs the struct ucsi and struct ucsi_connector instances without > > > registering anything, and into separate functions that then register > > > the ports, altmodes and what have you. I don't think that should be a > > > huge problem. It will make ucsi.c even more like a library, which is probable > > a good thing. > > Do you mean the solution to follow steps (a->b->c->d1) or (a->b->c->d2) ? > > a) ucsi_ccg.c calls first part of split ucsi_init() > > b) ucsi_ccg.c uses ucsi_send_command() to collect actual alternate modes. > > c) ucsi_ccg.c looks into actual alternate modes and squashes if duplicate > > altmode found. > > d1) ucsi_ccg.c calls new method to register connector alternate modes. > > This method issues GET_ALTERNATE_MODES command again and ucsi_ccg.c is > > expected to send squashed alternate mode. This will require changes in > > .read(), .sync_write() and > > .async_write() to make it appear as if the squashed data coming from the ppm. > > OR > > d2) ucsi_ccg.c calls new method to register squashed connector alternate > > modes. > > This method doesn't issue GET_ALTERNATE_MODES commands to PPM but > > simply registers the alternate mode values passed to this function. > > > > If you mean the (a->b->c->d2) solution then it looks fine to me and would wait > > for patches from you. This solution would mean that GET_ALTERNATE_MODES > > for connector is done only by each ucsi_xxx.c and not by ucsi.c > > I am waiting for your comments on this. Sorry Ajay. I lost track of this thread. The above is not exactly what I had in mind, but something like that. But in any case, I'll start wringing the patches then. thanks, -- heikki
