6.5-rc1 breakage in samsung-dsim

[Tim Harvey]

On Wed, Jul 12, 2023 at 12:24 PM Jagan Teki <jagan at amarulasolutions.com> wrote:
>
> On Thu, Jul 13, 2023 at 12:22 AM Tim Harvey <tharvey at gateworks.com> wrote:
> >
> > Greetings,
> >
> > I've noticed a regression in 6.5-rc1 that I'm having trouble bisecting
> > between 6.4 with regards to imx8mm MIPI DSI.
> >
> > I'm testing on an imx8mm-venice-gw72xx-0x with the following display:
> >  - Powertip PH800480T013-IDF02 compatible panel
> >  - Toshiba TC358762 compatible DSI to DBI bridge
> >  - ATTINY based regulator used for backlight controller and panel enable
> >
> > I'm using a dt overlay to support this [1] which works on 6.4 but on
> > 6.5-rc1 I get the following error:
> > [    6.110585] samsung-dsim 32e60000.dsi: xfer timed out: 29 06 00 00
> > 64 01 05 00 00 00
> > [    6.326588] tc358762 32e60000.dsi.0: error initializing bridge (-110)
> >
> > I'm trying to bisect this for some reason. Does anyone have any idea
> > what may be causing this or how I can debug it?
>
> What if you can revert or drop the dynamic PHY configuration (HEAD ...
> a617b33f7e51)? can you check it?
>
> Thanks,
> Jagan.

Hi Jagan,

That's one of the first things I tried but it didn't revert cleanly so
I simply did a git checkout of 1a56fcf08ae4 (the patch before
a617b33f7e51) as that was the before the 6 samsung-dsim patches I
suspected. This version also failed but then I did a git log and
noticed only 90 patches before the Linux 6.4-rc1 tag. This of course
predates Linux 6.4 yet a617b33f7e51 was not in 6.4 which is why I got
confused when a git bisect between v6.4 and v6.5-rc1 started bisecting
to patches that pre-dated v6.4. I'm so confused at this point :)

best regards,

Tim