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

[Thomas Niederprüm]

Hi Cristian,

Am Mittwoch, dem 18.02.2026 um 22:56 +0200 schrieb Cristian Ciocaltea:
> Hi Thomas,
> 
> On 2/18/26 10:43 PM, 1und1 wrote:
> > 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@60,
> > 1920x1080@50
> > and 1920x1080@30. All work now. Thanks for the quick fix! 
> 
> Thanks for the quick test!
> 
> I can add you to cc: when I submit the series, so that you may provide your
> Tested-by tag if you'd like to.

sure, I would be happy to.

> 
> > And the positive side> effect seems to be that you can now take one of your
> > old todos from your list.
> 
> Indeed. :-)
> 
> Regards,
> Cristian

Best regards,

Thomas