Re: [PATCH v2 5/5] arm64: dts: qcom: sdm845-xiaomi-beryllium-tianma: Disable MDSS

[David Heidelberg]

On 18/03/2026 15:47, Dmitry Baryshkov wrote:
> On Tue, Mar 17, 2026 at 11:12:35PM +0100, David Heidelberg via B4 Relay wrote:
> > From: Petr Hodina <petr.hodina@xxxxxxxxxxxxxx>
> >
> > Currently the panel driver for tianma is broken.
> > Disable MDSS to prevent DRM taking over the framebuffer.
>
> I'd still hope that somebody can get it to work. I'd start by using
> prepare_prev_first. Sumit reported the panel as working in 2020 and I
> have no doubts that it was the case. Another option migt be something
> related to the dispcc (see my [1]).

Sadly, the prepare_prev_first didn't solve the issue. The framebuffer -> MDSS 
takover happens, but at greetd (login) loading screen goes black and never restores.

Will need more work.

David>
> [1] https://lore.kernel.org/linux-arm-msm/20260217-sdm845-hdk-v1-1-866f1965fef7@xxxxxxxxxxxxxxxx/