Re: phy-qcom-qmp-combo: com_aux enable fails on a DP-only instance with no USB half (Snapdragon X2 Elite / glymur)

On 8/8/26 6:41 PM, Jesse Casco wrote:
> Hi,
> 
> On the ASUS Zenbook A16 (UX3607OA, Snapdragon X2 Elite Extreme, glymur /
> X2E94100) the internal HDMI output never produces a picture, and a second
> problem turns that into an unusable machine. I would like verification on
> the reading of both.
> 
> The failure
> 
> 	Failed to enable clk 'com_aux': -16
> 	phy phy-88e1000.phy.7: phy init failed --> -16
> 	  clk_branch_toggle <- clk_branch2_enable <- qmp_combo_com_init
> 	    <- qmp_combo_dp_init <- phy_init
> 
> Plugging a display in afterwards produces only "phy_power_on was called
> before phy_init", and the connector comes up with nothing behind it:

Seems like the display code blissfully ignores any errors that may come
from the PHY APIs.. Checking the return values and adding any unrolling
as necessary should make such failures non-fatal.

[...]

> Konrad, the merged commit lists the HDMI port as working, and it does not
> work here, so I am sure I am missing something on my side: kernel revision,
> a prerequisite, or a difference between units. One thing I can rule out --
> booting your merged DTS, the board brings up all three USB controllers
> including &usb_mp, so that is not it. Any pointer on what to check next
> would be welcome.

I carried a local hack to ignore this warning in my local tree. We're
trying to chase down the root cause of why the clock doesn't wanna
enable. I believe the DT is correct and it's a Linux problem.

Konrad

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