Re: [PATCH 0/2] drm/rockchip: dw_hdmi: Add 4k@30 support

[Sascha Hauer <s.hauer@pengutronix.de>]

Hi Andy Et al.,

On Mon, Aug 22, 2022 at 05:20:15PM +0200, Sascha Hauer wrote:
> This series adds support for 4k@30 to the rockchip HDMI controller. This
> has been tested on a rk3568 rock3a board. It should be possible to add
> 4k@60 support the same way, but it doesn't work for me, so let's add
> 4k@30 as a first step.

I tried adding 4k@60 support the same way, just by adding the missing
fields for 600MHz in the PLL/phy settings. I get a picture on the
screen, but it's not very stable: The monitor often gets black, scans
through the different HDMI inputs and then syncs again. Also when I
re-plug the cable while weston is running I won't get any picture
anymore (the same works fine with lower resolutions). I also tried
the Rock3a 4.19 Kernel which is based on the Rockchip Kernel and I saw
similar problems there.

Do you have an idea what could go wrong there?

Sascha


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