i2c almost working for me, was Re: i2c still not working for me

[Emmanuel Vadot]

On Fri, 19 Apr 2019 11:35:09 +0300
Daniel Braniss <danny at cs.huji.ac.il> wrote:

> 
> 
> > On 19 Apr 2019, at 11:05, Emmanuel Vadot <manu at bidouilliste.com> wrote:
> > 
> > On Fri, 19 Apr 2019 10:20:47 +0300
> > Daniel Braniss <danny at cs.huji.ac.il <mailto:danny at cs.huji.ac.il>> wrote:
> > 
> >> 
> >> 
> >>> On 18 Apr 2019, at 17:19, Ian Lepore <ian at freebsd.org> wrote:
> >>> 
> >>> On Thu, 2019-04-18 at 10:12 +0300, Daniel Braniss wrote:
> >>>>> On 17 Apr 2019, at 23:26, Emmanuel Vadot <manu at bidouilliste.com>
> >>>>> wrote:
> >>>>> 
> >>>>> On Tue, 16 Apr 2019 09:16:02 +0300
> >>>>> Daniel Braniss <danny at cs.huji.ac.il <mailto:danny at cs.huji.ac.il>>
> >>>>> wrote:
> >>>>> 
> >>>>>> 
> >>>>>> 
> >>>>>>> On 11 Apr 2019, at 09:56, Daniel Braniss <danny at cs.huji.ac.il>
> >>>>>>> wrote:
> >>>>>>> 
> >>>>>>> if no device is connected, I2CRDWR hangs, 
> >>>>>>> it also happens with i2c(8) -s, only reboot helps.
> >>>>>>> 
> >>>>>>> ichb1: twsi_reset: Using IIC_FASTEST/UNKNOWN mode with speed
> >>>>>>> param=2a
> >>>>>>> iichb1: TWSI_WRITE: Writing 0 to 18
> >>>>>>> iichb1: TWSI_WRITE: Writing 2a to 14
> >>>>>>> iichb1: TWSI_WRITE: Writing 40 to c
> >>>>>>> iichb1: TWSI_WRITE: Writing c4 to c
> >>>>>>> iichb1: twsi_transfer: transmitting 2 messages
> >>>>>>> iichb1: TWSI_READ: read f8 from 10
> >>>>>>> iichb1: twsi_transfer: status=f8
> >>>>>>> iichb1: twsi_transfer: msg[0] flags: 0
> >>>>>>> iichb1: twsi_transfer: msg[0] len: 9
> >>>>>>> iichb1: TWSI_WRITE: Writing e4 to c
> >>>>>>> 
> >>>>>>> and now it?s hung
> >>>>>> 
> >>>>>> [?]
> >>>>> 
> >>>>> I don't see that on my OrangePi One or Pine64-LTS.
> >>>> 
> >>>> well, mine is are Nanopi Neo, maybe it?s a dts issue?
> >>>> I also have a orangepi-zero but it will take me some time to make
> >>>> a sdcard
> >> 
> >> I managed to boot my OrangePi Zero, and i2c -s has no issues, does not hang.
> >> still, with the latest (r346368) my NanoPi Neo hangs when no i2c device is present,
> >> so what is the difference? or where can I look?
> > 
> > Are you using the same i2c controller on both ?
> yes, and have tested with several controllers and nanopies, 
> 
> > Could you paste somewhere the overlays or dts patches ?
> cat ./allwinner/dts/12/h3-i2c.dtso
> /dts-v1/;
> /plugin/;
> 
> //#include "sun8i-h3-nanopi-neo.dts"
> 
> / {
>  compatible = "allwinner,sun8i-h3";
> };
> 
> &i2c0 {
>          ##frequency = <50000>;
>          status = "okay";
> };
> 
> &i2c1 {
>          ##frequency = <50000>;
>          status = "okay";
> };
> 
> 

 And you have hang on both i2c0 and i2c1 ?
 Also please note that i2c1 pins aren't routed on this PCB, I don't
think that this could/should make the i2c controller hangs but ...

-- 
Emmanuel Vadot <manu at bidouilliste.com> <manu at freebsd.org>