[PATCH v3 06/13] drm: bridge: samsung-dsim: Add DSI init in bridge pre_enable()

[Jagan Teki]

Hi Dave,

On Fri, Jul 22, 2022 at 9:35 PM Dave Stevenson
<dave.stevenson at raspberrypi.com> wrote:
>
> Hi Jagan and Marek.
>
> On Fri, 22 Jul 2022 at 16:35, Marek Szyprowski <m.szyprowski at samsung.com> wrote:
> >
> > On 20.07.2022 17:52, Jagan Teki wrote:
> > > Host transfer() in DSI master will invoke only when the DSI commands
> > > are sent from DSI devices like DSI Panel or DSI bridges and this
> > > host transfer wouldn't invoke for I2C-based-DSI bridge drivers.
> > >
> > > Handling DSI host initialization in transfer calls misses the
> > > controller setup for I2C configured DSI bridges.
> > >
> > > This patch adds the DSI initialization from transfer to bridge
> > > pre_enable as the bridge pre_enable API is invoked by core as
> > > it is common across all classes of DSI device drivers.
> >
> > This is still problematic in case of Exynos. Without a workaround like this
> >
> > https://github.com/mszyprow/linux/commit/11bbfc61272da9610dd5c574bb8ef838dc150961
> >
> > the display on the all real DSI panels on my Exynos based boards is broken.
>
> I'd queried on the other thread trying to address DSI operation [1] as
> to whether the test for STOP_STATE (presumably LP-11) at [2] was
> actually valid, but had no response.
> There is no need to check for bus contention at that point, but should
> it happen the driver doesn't write the registers in lines 862-868
> having returned -EFAULT at line 853. The controller is therefore only
> partially initialised.

Can you link me if you have any updated series on this? or the
existing one is the latest one itself?

Thanks,
Jagan.