[PATCH v3 0/3] drm/rockchip: dw_hdmi: Add 4k at 30 support

[Daniel Stone]

Hi Sascha,

On Mon, 6 Feb 2023 at 15:49, Sascha Hauer <s.hauer at pengutronix.de> wrote:
> On Mon, Feb 06, 2023 at 03:04:48PM +0100, Sascha Hauer wrote:
> > I guess a first step would be to limit the maximum resolution of vopl
> > to what the hardware can do. We would likely end up with 1080p by
> > default then for the applications.
>
> I did that, but the result is not what I expected. Discarding a mode in
> the connector means it won't show up in the connectors list of modes.
> Discarding it in the CRTC though means the mode is still exposed by the
> connector, but actually trying to use it then fails.
>
> This means when discarding the mode in the CRTC the screen stays black.
>
> I am not sure where I should go from here.

You've done the right thing. Userspace should detect this and try with
alternative CRTC routing. The kernel shouldn't be trying to solve this
problem.

Cheers,
Daniel