linux-kernel - Re: [PATCH v2 2/2] drm/bridge: anx7688: Add anx7688 bridge driver support

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Date:   Fri, 6 Mar 2020 13:07:26 +0100
From:   Ondřej Jirman <megous@...ous.com>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Enric Balletbo Serra <eballetbo@...il.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        David Airlie <airlied@...ux.ie>, Torsten Duwe <duwe@...e.de>,
        Jonas Karlman <jonas@...boo.se>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Maxime Ripard <maxime@...no.tech>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Collabora Kernel ML <kernel@...labora.com>
Subject: Re: [PATCH v2 2/2] drm/bridge: anx7688: Add anx7688 bridge driver
 support

On Fri, Mar 06, 2020 at 04:53:46PM +0800, Icenowy Zheng wrote:
> 在 2020-03-06星期五的 09:46 +0100，Enric Balletbo i Serra写道：
> > Hi Ondrej,
> > 
> > On 5/3/20 20:35, Ondřej Jirman wrote:
> > > Hi,
> > > 
> > > On Thu, Mar 05, 2020 at 10:29:33AM -0800, Vasily Khoruzhick wrote:
> > > > On Thu, Mar 5, 2020 at 7:28 AM Enric Balletbo i Serra
> > > > <enric.balletbo@...labora.com> wrote:
> > > > > Hi Vasily,
> > > > 
> > > > CC: Icenowy and Ondrej
> > > > > Would you mind to check which firmware version is running the
> > > > > anx7688 in
> > > > > PinePhone, I think should be easy to check with i2c-tools.
> > > > 
> > > > Icenowy, Ondrej, can you guys please check anx7688 firmware
> > > > version?
> > > 
> > > i2cget 0 0x28 0x00 w
> > > 0xaaaa
> > > 
> > > i2cget 0 0x28 0x02 w
> > > 0x7688
> > > 
> > > i2cget 0 0x28 0x80 w
> > > 0x0000
> > > 
> > 
> > Can you check the value for 0x81 too?
> 
> root@...-pinephone [ ~ ] # i2cdump 0 0x28
> No size specified (using byte-data access)
> WARNING! This program can confuse your I2C bus, cause data loss and
> worse!
> I will probe file /dev/i2c-0, address 0x28, mode byte
> Continue? [Y/n] 
>      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
> 00: aa aa 88 76 ac 00 00 00 00 00 00 00 00 00 05 05    ???v?.........??
> 10: 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    0...............
> 20: 00 00 00 00 00 00 00 00 00 00 00 24 f2 e4 ff 00    ...........$??..
> 30: 06 40 00 04 94 11 20 ff ff 03 00 bf ff ff 10 01    ?@...? ..?.?..??
> 40: 72 a4 00 09 00 08 05 84 15 40 17 00 00 0a 00 e0    r?.?.????@...?.?
> 50: 00 00 00 0a 10 00 e0 df ff ff 00 00 00 10 71 00    ...??.??.....?q.
> 60: 10 10 04 29 2d 21 10 01 09 13 00 03 e8 13 88 00    ???)-!????.????.
> 70: 00 19 18 83 16 5c 11 00 ff 00 00 0d 04 38 42 07    .????\?....??8B?
> 80: 00 00 00 00 00 74 1b 19 44 08 75 00 00 00 00 00    .....t??D?u.....
> 90: 01 02 00 00 00 00 03 00 ff 30 00 59 01 00 00 00    ??....?..0.Y?...
> a0: 00 ff fe ff ff 00 00 00 00 00 00 00 00 00 00 02    ..?............?
> b0: 00 00 00 00 00 00 40 00 28 00 00 00 00 44 08 00    ......@.(....D?.
> c0: 00 00 00 00 80 00 10 01 0a 10 18 00 00 fd 00 00    ....?.?????..?..
> d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> e0: 50 10 08 50 00 02 00 70 00 00 30 10 0b 02 1c 01    P??P.?.p..0?????
> f0: 00 0b 07 00 94 11 7f 00 00 00 00 00 00 01 0e ff    .??.???......??.

My values for 0x28 address match this. ^

Interesting that it returns different register values for different
device addresses.

> root@...-pinephone [ ~ ] # i2cdump 0 0x2c
> No size specified (using byte-data access)
> WARNING! This program can confuse your I2C bus, cause data loss and
> worse!
> I will probe file /dev/i2c-0, address 0x2c, mode byte
> Continue? [Y/n] 
>      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
> 00: 29 1f 88 76 00 ac 11 00 11 20 10 10 00 00 00 00    )??v.??.? ??....
> 10: 03 00 ff 8f ff 7f 00 00 00 00 05 00 10 0a 0c 00    ?..?.?....?.???.
> 20: 00 00 00 00 99 06 c0 00 00 00 00 00 00 00 02 00    ....???.......?.
> 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> 40: 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ?...............
> 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> 70: b8 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ?...............
> 80: 01 25 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ?%..............
> 90: 0f 0f 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ??..............
> a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
> 
> > 
> > Thanks,
> >  Enric
> > 
> > 
> > > regards,
> > > 	o.
> > > 
> > > > > Thanks in advance,
> > > > >  Enric
> > > > > 
> > > > > [snip]
>