Thanks again Sean, On 09/14/2015 07:54 AM, Sean Young wrote: > On Mon, Sep 14, 2015 at 07:34:10AM -0700, Eric Nelson wrote: >> Thanks Shawn, >> >> On 09/14/2015 03:00 AM, Sean Young wrote: >>> On Fri, Sep 11, 2015 at 07:00:24AM -0700, Eric Nelson wrote: >>>> Many decoders require a trailing space (period without IR illumination) >>>> to be delivered before completing a decode. >>>> >>>> Since the gpio-ir-recv driver only delivers events on gpio transitions, >>>> a single IR symbol (caused by a quick touch on an IR remote) will not >>>> be properly decoded without the use of a timer to flush the tail end >>>> state of the IR receiver. >>> >>> This is a problem other IR drivers suffer from too. It might be better >>> to send a IR timeout event like st_rc_send_lirc_timeout() in st_rc.c, >>> with the duration set to what the timeout was. That is what irraw >>> timeouts are for; much better than fake transitions. >>> >> >> If I'm understanding this correctly, this would require modification >> of each decoder to handle what seems to be a special case regarding >> the GPIO IR driver (which needs an edge to trigger an interrupt). > > No, this is not a special case. Many drivers do have extra code to generate > some sort of end-of-signal message: redrat3; igorplugusb; st_rc. They don't > handle it consistently but this should be fixed. > > Secondly, the decoders already handle it. A timeout event matches > is_timing_event(), so it's processed by the decoders. The duration should > be set correctly. > I think I did misunderstand you. You're suggesting that I re-work the patch to gpio-ir-recv.c to produce a timeout instead of an edge. Is that right? >> Isn't it better to have the device interface handle this in one place? > >>>> This patch adds an optional device tree node "flush-ms" which, if >>>> present, will use a jiffie-based timer to complete the last pulse >>>> stream and allow decode. >>> >>> A common value for this is 100ms, I'm not sure what use it has to have >>> it configurable. It's nice to have it exposed in rc_dev->timeout. >>> >> >> I'm enough of a n00b regarding the details of the various decoders >> not to know that... >> >> I looked through the couple of decoders my customer was using (NEC and >> RC6) and came up with a value of 100ms though... >> >> Implementing this through DT and having the default as 0 (disabled) >> provides an interim solution if the choice is made to change each of >> the decoders, since I would expect that to take a while and a bunch of >> remote control devices for testing. > > Many other drivers use 100ms just fine and I don't remember ever seeing > any bug reports on that. > So you'd like to see this as a constant? Please advise, Eric -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
