wiki: Porting wiki: Porting Chat Log

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

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+Multimedia-chat-meeting-2016-12-07
+
+<morimoto> Hi  [16:59]
+<pinchartl> hello
+<neg> hi all
+<morimoto> Hyvaa huomenta  [17:00]
+* morimoto I can't pronunciation
+*** uli___ (~uli___@static.206.203.46.78.clients.your-server.de) has joined
+    channel #periperi  [17:01]
+<pinchartl> morimoto: even writing it is difficult on your keyboard :-)
+<pinchartl> do you have a key for ä ?
+<morimoto> Unfortunately, No.
+<morimoto> :P
+<pinchartl> kbingham said he might not be able to attend the meeting today
+								        [17:03]
+<kbingham> pinchartl: Terribly sorry to say I managed to make it (just)
+<pinchartl> :-)
+<pinchartl> welcome !
+<pinchartl> and Magnus seems to be missing
+<kbingham> Morning all :D
+<morimoto> Morning kbingham  [17:04]
+<uli___> morning
+<pinchartl> so let's get started
+<pinchartl> topics for today
+<pinchartl> - Status check for the multimedia tasks  [17:05]
+<pinchartl> - Next meeting
+<pinchartl> anything else ?
+<morimoto> FOSDEM ?
+<morimoto> (I don't go though)
+<pinchartl> the rabbits will miss you  [17:06]
+<morimoto> Hehe :) me to
+<morimoto> too
+<pinchartl> so  [17:07]
+<pinchartl> Topic 1. Status check for the multimedia tasks
+<pinchartl> kbingham: do you mind starting ?
+<kbingham> pinchartl: I'd actaully like to go last so I can upload something
+	   :D  [17:08]
+<kbingham> (which will show why I was skiiving of work yesterday to work on a
+	   personal project :D)
+<pinchartl> ok, let's reverse the order then
+<pinchartl> uli___: your turn
+<uli___> ok
+<uli___> so i collected a bunch of patches and checked if the vsp-tests run
+	 with ipmmu enabled  [17:09]
+<uli___> on gen3
+<uli___> with a little fix, they do
+<uli___> although i had a few issues on m3-w
+<pinchartl> what kind of issues ?
+<uli___> where the system gets sluggish when running vsp-tests, with or
+	 without ipmmu enabled
+<uli___> sometimes it freezes
+<uli___> but the tests pass  [17:10]
+<uli___> haven't found out what that could be
+<pinchartl> I haven't noticed that
+<pinchartl> but I mostly use H3
+<uli___> no issues on h3  [17:11]
+<pinchartl> ok, we'll need to investigate that
+<pinchartl> I'm a bit surprised that IPMMU works given that it's supposed to
+	    be broken at the hardware level  [17:12]
+<uli___> :)
+<pinchartl> issues and blockers ?  [17:13]
+<uli___> pressed for time. other than that, none
+<pinchartl> I see you'll be on vacation from next Monday to the 3rd of January
+	    ?  [17:14]
+<uli___> yes
+<morimoto> Wow! winter vacation ?
+<pinchartl> have fun, both finishing all your tasks before that, and during
+	    your vacation :-)
+<uli___> :)  [17:15]
+<pinchartl> next, neg
+<neg> A) Nothing
+<neg> B) Address CSI2 review comments  [17:16]
+<neg> C) None
+<pinchartl> easy :-)
+<pinchartl> thanks
+<neg> Will also have a shorter vacation trip then uli___ from 27 Dec -- 6 Jan
+      :-)
+<pinchartl> I'll wish you a good vacation during the next meeting then :-)
+								        [17:17]
+<pinchartl> next, Morimoto-san
+<morimoto> OK
+<morimoto> A)  [17:18]
+<morimoto> I got review from Rob about OF-graph HDMI sound. He don't like
+	   current style. Now I'm discussing about it.
+<morimoto> 
+<morimoto> B)
+<morimoto> DU side DT will have HDMI video and sound. ALSA SoC side needs to
+	   know total how many HDMI sound port exist.
+<morimoto> but, Rob rejected "type=" property. So, I can't know.
+<morimoto> ---- from Rob ----------------
+<morimoto> I still don't think this is necessary. Simply define which port
+	   number
+<morimoto> is which for each HDMI chip.
+<morimoto> If this is necessary, then the types, video and sound, are too
+	   generic.
+<morimoto> ------------------------------
+<morimoto> What does it mean ?? How to get this information from ALSA side ??
+<morimoto> I think I need to corroborate with HDMI video ?
+<morimoto> s/corroborate/collaborate  [17:19]
+<morimoto> C)  [17:20]
+<morimoto> I need to re-create OF-graph patches.
+<morimoto> Can I use Laurent version ? I'm using Ulrich version
+<morimoto> -- EOT --
+<pinchartl> regarding the type property
+<pinchartl> the DT bindings for each HDMI encoder define the number and type
+	    of each port
+<pinchartl> Rob's point is that, instead of adding a generic type property,
+	    you should query the HDMI encoder driver at runtime to know the
+	    number of audio ports  [17:21]
+<pinchartl> I'm not sure if that's feasible though, I haven't checked how it
+	    works on ALSA"s side
+<morimoto> but in runtime query, how the driver know total size ?  [17:22]
+<morimoto> fixed size, does it mean ?
+<pinchartl> the driver knows because the driver knows the hardware
+<pinchartl> it's hardcoded in the driver  [17:23]
+<morimoto> OK, I see.
+<pinchartl> for instance let's say we have an HDMI encoder with two sound
+	    inputs, one video input and one HDMI output
+<pinchartl> that's 4 ports
+<pinchartl> the DT bindings would document something like
+<pinchartl> port 0: video in
+<pinchartl> port 1: audio 0 in
+<pinchartl> port 2: audio 1 in
+<pinchartl> port 3: hdmi output  [17:24]
+<pinchartl> then let's imagine that the board has audio 1 in connected
+<pinchartl> and audio 0 not connected
+<pinchartl> DT would have port 2 connected with an endpoint
+<pinchartl> and port 1 not connected, with no endpoint
+<pinchartl> the driver would parse the DT node
+<pinchartl> see that port 1 is not connected and port 2 is connected  [17:25]
+<pinchartl> and conclude that there's one audio input in use among the two
+	    possible audio inputs
+<pinchartl> there's no need for a type property there
+<pinchartl> the type property would only be needed if you need geenric code to
+	    parse the DT node, code that has no knowledge of the device
+								        [17:26]
+<morimoto> So this mean we need new "query" function for it ?
+<morimoto> it tell "for video port" "for sound port" or "connected", something
+	   like that  [17:27]
+<pinchartl> that would be the idea. again, as I'm not too familiar with ALSA's
+	    internals I don't know if that would be easy, or even good
+<pinchartl> but Rob's point is that code that parses the OF graph in a
+	    completely generic way is usually a bad idea  [17:28]
+<morimoto> OK
+<pinchartl> because DT properties are defined by DT bindings in relationship
+	    with the compatible strings
+<pinchartl> so a generic function that walks through the OF graph, from node
+	    to node, trying to collect information about each node, can't know
+	    for sure what a property means  [17:29]
+<morimoto> +1 question is that this mean, DU driver will have this "query"
+	   function, righ ?
+<pinchartl> I'm not as opposed to that as he is, but I understand his point
+<pinchartl> do you mean the dw-hdmi driver ?
+<morimoto> I don't know. DU has port, right ?  [17:30]
+<morimoto> not dw-hdmi
+*** horms (~horms@217.111.208.18) has joined channel #periperi
+<pinchartl> the DU has a DT node, yes
+<pinchartl> but DU doesn't handle sound
+<pinchartl> the HDMI encoder DT node does  [17:31]
+<morimoto> Yes, yes. DU driver only handle video side, but will have
+	   video/sound port in DT.
+<morimoto> This means, DU driver need to care about video/sound port, too
+<pinchartl>
+	    https://git.linuxtv.org/pinchartl/media.git/commit/?h=drm/du/hdmi&id=3d12f1ed444c7d38e4006d51155dfebca0bb3d22
+								        [17:32]
+<pinchartl> those are the DT nodes that will have audio ports
+<pinchartl> they're handled by the new rcar-dw-hdmi driver
+<pinchartl>
+	    https://git.linuxtv.org/pinchartl/media.git/commit/?h=drm/du/hdmi&id=59115b56b8156a60b5e1d3e0077611ed403b6154
+<pinchartl> which is the platform glue layer for the dw-hdmi core code  [17:33]
+<morimoto> Oops, I need to rebase to it  [17:34]
+<morimoto> Does renesas-driver has it ?
+<pinchartl> it should, yes
+<morimoto> OK.
+<pinchartl> Geert told me yesterday he would merge it
+<morimoto> And it is almost upstream version ?
+<pinchartl> yes
+<morimoto> OK  [17:35]
+<pinchartl> I've posted v1 already
+<pinchartl> and will post v2 soon
+<pinchartl> (more about that when it will be my turn)
+<morimoto> OK, I will rebase to it, and consider about query function.
+<morimoto> But, 
+<morimoto> HDMI will have "sound" port anyway. So video side need to care it,
+	   right ?  [17:36]
+<morimoto> (avoid sound port, etc..)
+<pinchartl> yes it will
+<morimoto> Or HDMI video/sound can share same port ?  [17:37]
+<pinchartl> it should be two different ports
+<morimoto> OK, nice to know
+<morimoto> I will investigate it next week. thanks
+<pinchartl> so we would need an API to walk the DT graph with assistance from
+	    drivers
+<pinchartl> you're welcome
+<morimoto> I will ask about query to Rob  [17:38]
+<pinchartl> I think I've answered your question about which version of the
+	    HDMI patches you should use
+<pinchartl> so now it's my turn :-)
+<pinchartl> since last meeting  [17:39]
+<pinchartl> as I said, I've posted the HDMI output on Gen3 patches
+<pinchartl> Kieran and I have been working together on that
+<pinchartl> we got rid of all hacks  [17:40]
+<pinchartl> one of the good news is that ES1.x / ES2.0 don't need special
+	    handling anymore
+<morimoto> Nice
+<pinchartl> the series cleans up and enhances the dw-hdmi driver
+<pinchartl> I've received a few comments about that
+<pinchartl> and reworked the patches accordingly  [17:41]
+<pinchartl> based on information I managed to gather about the Synopsys DWC
+	    HDMI TX IP core
+<pinchartl> it's not easy, as there's no public datasheet from Synopsys
+<pinchartl> speaking of which, I talked to one of their engineers in private
+<pinchartl> he said he wasn't allowed to give me information
+<pinchartl> but that, if I needed support, I should be able to get it through
+	    Renesas  [17:42]
+<pinchartl> he said that if Renesas contacted Synopsys' support, the question
+	    would be routed to him, and he could then talk to me in direct :-)
+<pinchartl> so far I managed to solve most of the problems withotu needing
+	    that
+<pinchartl> I've also done review, there was quite a bit of discussion about
+	    the DRIF DT bindings  [17:44]
+<pinchartl> no time to post a proposal for the rotation and histogram APIs yet
+	    I'm afraid  [17:45]
+<pinchartl> I'll try to address that in the next two weeks
+<pinchartl> aV4L2 cache
+<pinchartl> oops
+<pinchartl> as well as starting the V4L2 cache discussion
+<pinchartl> no real issue or blocker, I've been slowed down by the lack of
+	    public dwc hdmi documentation, but I found a leaked datasheet and
+	    gathered more information from several developers  [17:46]
+<pinchartl> so at the moment it's not an issue
+<pinchartl> that's it for me  [17:47]
+<pinchartl> kbingham: your turn now
+<kbingham> Ok :D
+<kbingham> So - as per the mail I sent - I've fixed suspend resume on m2m
+	   pipelines, and incorporated the fix for the BRU race I discovered
+	   into this as well.  [17:48]
+<kbingham> I've also written a couple of automated tests for suspend resume
+	   which should make their way into vsp-tests. - It's quite neat, as
+	   it uses a PM debug tool in the kernel to suspend, and then
+	   automatically resume after 5 seconds.  [17:49]
+<pinchartl> (bit of context for the reader, M2M pipeline refers to the VSP)
+								        [17:50]
+<kbingham> Ah yes - sorry - I was lacking context there :D - There are still
+	   issues in the display pipeline but that is more complicated as we
+	   are then dealing with making sure multiple cells suspend resume
+	   cleanly I believe.  [17:51]
+<pinchartl> yes, DU suspend/resume still needs work
+<kbingham> Aside from that - I've done some work on HDMI with Laurent, and
+	   I've been supporting Duc@Jinso to help him get a set up for testing
+	   the writeback prototype I posted last month.
+<kbingham> My B) section is a little 'fuzzy' at the moment, so I'll leave that
+	   section blank for now :D  [17:52]
+<kbingham> C) - There was a lot of time spent looking after Jinso :(  [17:53]
+<kbingham> D) Show(off) and tell -
+<kbingham>  - I've made an LED Christmas Tree Hat (for Xmas parties)
+<kbingham>  - https://goo.gl/photos/PRyXXbpJdJbokBQ56
+<pinchartl> :-D
+<neg> nice
+<kbingham> Speak of the devil - Duc@Jinso has just mailed me again :D  [17:54]
+<pinchartl> Morimoto-san: I've sent you an e-mail regarding the support we
+	    have to provide to Jinso
+<morimoto> Nice hat !  [17:55]
+<pinchartl> Magnus told me he would discuss it with you, tomorrow if I
+	    remember correctly
+<morimoto> OK, I will talk to him. 
+<morimoto> Renesas side needs discuss about that ;P
+<pinchartl> kbingham: what's your vacation schedule for the end of the year ?
+								        [17:57]
+<kbingham> ...
+<kbingham> That's just what I was writing next :D
+<kbingham> Or rather was going to ask about :D
+<kbingham> Keri is on holiday from school from the 19th to the 3rd.  [17:58]
+<kbingham> I don't necessarily need all that time as holiday - but I don't
+	   think I have much work planned at the moment ...
+<pinchartl> ok  [17:59]
+<pinchartl> speaking of which
+<kbingham> Certainly - I won't be working 23rd to 3rd probably  [18:00]
+<pinchartl> Morimoto-san, you mentioned a VSP/DU performance problem reported
+	    by a customer
+<pinchartl> has there been any feedback on that ?
+<pinchartl> it sounded quite urgent, is it something that we need to start
+	    working on before January ?
+<morimoto> There is no response from BSP team, at this point  [18:01]
+<morimoto> let me check
+<pinchartl> ok, we'll wait and see then
+<kbingham> Ok - well I have plenty of work to continue getting my garage
+	   office conversion :D  [18:02]
+<pinchartl> :-)
+<pinchartl> and speaking of winter holidays, will Renesas be operating between
+	    christmas and new year ?
+<kbingham> so that will keep me busy in the meanwhile.
+<kbingham> pinchartl: Are you going to take a break anytime ?  [18:03]
+<pinchartl> I'll be in Belgium from the 21st to the 29th  [18:04]
+<pinchartl> I'll still be available 21st-23rd (minus time stuck in transport
+	    on the 21st)
+<pinchartl> and will take 24th-29th off  [18:05]
+<morimoto> Renesas side will have winter vacation from 29th Dec - 9th Jan
+<morimoto> BSP team want to know VSP/DU plan, at this point.  [18:06]
+<pinchartl> the plan to fix the issue they've reported ?
+<morimoto> They will explain current situation to customer, but customer want
+	   to know its plan
+<morimoto> Yes
+<pinchartl> we can either start working on it in 2017/Q1  [18:07]
+<pinchartl> or, if it's urgent, Kieran could start investigating it in
+	    December already
+<horms> morimoto: are those dates inclusive or exclusive?
+<pinchartl> but we'll need an additional task for him
+<morimoto> horms: sorry, what do you mean ?  [18:08]
+<horms> do you start holiday on Friday or Saturday?
+<horms> Do you finish holiday on Sunday or Monday?
+<pinchartl> horms: the 29th is actually a Thursday
+<horms> ok, sorry  [18:09]
+<horms> its not so important in any case
+<pinchartl> no worries, calendars are confusing :-)
+<morimoto> BSP team is thinkingl  [18:10]
+<morimoto> oops
+<morimoto> BSP team is thinking that they can get some kind of result from
+	   upstream January - March  [18:11]
+<morimoto> Is it possible, do you think ?
+<pinchartl> that works for me
+<morimoto> OK, so Kieran can spend relax Christmas :)  [18:12]
+<pinchartl> :-)
+<kbingham> morimoto: I'm not sure the words 'relax' and 'christmas' go
+	   together anymore :S
+<kbingham> but yes :D
+<morimoto> sorry for my English  [18:13]
+<neg> kbingham: that's why I go to the caribbeans and drink rum, I will be
+      relaxed :-)
+<kbingham> morimoto: No your english was fine :D
+<kbingham> neg: Got any room in your luggage to pack me ?
+<morimoto> horms: Renesas last working day is 28th, and holiday started from
+	   29th
+<horms> thanks  [18:14]
+<morimoto> horms: last holiday is 9th, start works from 10th. Is this clear ?
+<pinchartl> morimoto: very clear, thanks
+<pinchartl> next topic, FOSDEM
+<horms> very clear, thanks
+<pinchartl> Morimoto-san will unfortunately not be able to join us  [18:15]
+<morimoto> horms: np
+<pinchartl> has there been a confirmation that a core meeting will be held on
+	    Friday the 3rd of February ?
+<horms> I think that is more or less confirmed
+<pinchartl> ok
+<horms> geertu: ?
+<geertu> horms: yes?  [18:16]
+<horms> geertu: is f2f core meeting on 3rd Feb confirmed?
+<geertu> horms: If Laurent and Magnus join, we are 6 persons.  [18:17]
+<geertu> which is critical mass, I believe? So yes
+<pinchartl> I'll be there
+<morimoto> Magnus said he arrive at Feb 3th  [18:18]
+<morimoto> Feb 3rd afternoon
+<pinchartl> ok
+<morimoto> afternoon = 16:05  [18:19]
+<geertu> Hmmm...
+<geertu> He also said he might change his plane
+<kbingham> geertu: I'll likely be there by then regardless - so I might join
+	   you for somewhere to keep warm :D
+<kbingham> If I'm not wanted - I'll explore brussels :)  [18:20]
+<geertu> Will there be an MM meeting on Thursday?
+<pinchartl> at this point there's no formal plan for a multimedia meeting, but
+	    I've booked the afternoon of February the 2nd nonetheless
+<kbingham> Brussels?
+<geertu> Or will it just ve I/O and Core on Friday?
+<pinchartl> if you're in Brussels, I'm sure we won't run out of multimedia
+	    topics to discuss
+<pinchartl> next topic, next meeting  [18:22]
+<pinchartl> I propose two weeks from now
+<pinchartl> on the 21st
+<pinchartl> Ulrich is already excused as he will be on holidays
+<neg> 21st works for me
+<pinchartl> uli___: but please report your progress by e-mail before leaving
+								        [18:23]
+<morimoto> 21st doesn't works for me :(
+<uli___> ok
+<pinchartl> morimoto: we can move it to Tuesday or Thursday
+<morimoto> 20th, 22th are OK
+<geertu> Core meeting on Dec 20th?  [18:24]
+<geertu> (still have to complete the report and mail it out)
+<pinchartl> there's the core meeting on Tuesday already. we can have the
+	    multimedia meeting after core, but it will be late for you
+<pinchartl> so maybe 22nd then ?
+<morimoto> 22nd is OK for me  [18:25]
+<pinchartl> 22nd then. same time, 08:00 GMT / 09:00 CET / 10:00 EET / 17:00
+	    JST
+<morimoto> Thanks. I booked  [18:26]
+<pinchartl> and that's all we have on the agenda for today. I propose
+	    adjourning the meeting, does anyone second ?
+<kbingham> I'll skip to thirded :D
+<uli___> fourthed
+<pinchartl> thank you all for attending  [18:27]
+<pinchartl> and have a nice day or evening
+<kbingham> Cheers all !
+<neg> thanks all
+<morimoto> Thanks!