Re: [PATCH 0/7] qcom: initial support for the OnePlus 8T

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On Mon, 24 Jun 2024 at 14:33, Caleb Connolly <caleb@xxxxxxxxxxxxxxxx> wrote:
>
>
>
> On 24/06/2024 07:18, Dmitry Baryshkov wrote:
> > On Mon, Jun 24, 2024 at 03:30:24AM GMT, Caleb Connolly wrote:
> >> Add bindings for the SM8250 OnePlus devices, a common devicetree,
> >> touchscreen and display drivers, and a dts for the OnePlus 8T (kebab).
> >>
> >> The OnePlus 8 series is made up of 3 flagship smartphones from 2019,
> >> featuring the Qualcomm X55 5G PCIe modem.
> >>
> >> This series introduces initial support for the 8T, adding drivers for
> >> the 1080x2400 120Hz DSC panel and the Synaptics TCM Oncell touchscreen.
> >>
> >> The panel driver suffers from similar limitations to the LG SW43408
> >> panel found on the Pixel 3, namely that after toggling the reset GPIO it
> >> is not possible to get the panel into a working state.
> >
> > Just to point it out: this is no longer true for SW43408. The panel
> > wakes up and works after toggling the reset. It seems, there is an issue
> > with one of the regulators, but not with the reset and/or panel startup.
>
> Hmm ok, I've heard mixed reports then, I should try it out myself again.

During MAD24 we have seen an issue with the regulators, when the panel
doesn't wake up. But resetting the panel works.

>
> I'll update the cover letter to reflect this. Thanks.
> >
> >> Given the apparent prevelance of this issue, particularly with DSC
> >> panels, I believe this is a bug in the core DSI code, and not a device
> >> or panel specific issue. I think it is still useful to accept these
> >> panel drivers into upstream since, from a users perspective, the panel
> >> is fully functional just by leaving the reset GPIO alone and keeping the
> >> regulator on. The only (theoretical) downside is worse battery life,
> >> which is a small price to pay for a working display.
> >>
> >



-- 
With best wishes
Dmitry



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