[REGRESSION] HDMI monitor not working on Radxa Rock 5B after phy rockchip samsung hdptx HDMI 2.1 FRL patchset

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Hi Cristian,


Am Mittwoch, dem 18.02.2026 um 22:15 +0200 schrieb Cristian Ciocaltea:
> On 2/18/26 3:22 AM, Cristian Ciocaltea wrote:
> > On 2/18/26 2:52 AM, Cristian Ciocaltea wrote:
> > > Hi Thomas,
> > [...]
> > 
> > > 
> > > Sorry, I somehow missed the following warning message, though it has been
> > > already present in all the logs you've sent to me so far:
> > > 
> > >   rockchip-hdptx-phy fed60000.phy: PLL locked by unknown consumer!
> > > 
> > > That indicates the PHY has been preconfigured by an external component
> > > (e.g. the
> > > bootloader), which is actually a scenario that I didn't verify.
> > > 
> > > However, this just another way to expose a limitation of the current
> > > approach
> > > for managing the TMDS character rate: done via the Common Clock Framework
> > > API
> > > instead of the HDMI PHY configuration API.
> > > 
> > > As a matter of fact, it was actually an item on my TODOs list for quite a
> > > while,
> > > but blocked until recently due to several dependencies waiting to be
> > > merged
> > > upstream.
> > > 
> > > Hence I took the opportunity to finalize this task - please give the
> > > following
> > > commits in my rk3588-hdmi-debug branch [2] a try:
> > 
> > I've just realized I introduced a regression while doing some cleanup work,
> > hence
> > please ignore this until further notice.
> 
> I think I got this working properly now, at least it passes all the tests I
> could run.  The updated commits in [2] are:
> 
>   fa7cd1e75aaa ("phy: rockchip: samsung-hdptx: Fix rate recalculation for high
> bpc")
>   8048db5544da ("phy: rockchip: samsung-hdptx: Exclusively use PHY config API
> for PLL changes")
>   0085a382dfd0 ("[DEBUG] drm/rockchip: Add HDMI verbose logging")
> 

applying these commits solves my problems. I tested 1920x1080 at 60, 1920x1080 at 50
and 1920x1080 at 30. All work now. Thanks for the quick fix! And the positive side
effect seems to be that you can now take one of your old todos from your list.

Best regards,

Thomas