Re: [PATCH RFC 0/2] arm64: dts: qcom: eliza: Add display

[Krzysztof Kozlowski <krzk@kernel.org>]

On 31/03/2026 16:49, Konrad Dybcio wrote:
> On 3/31/26 4:02 PM, Krzysztof Kozlowski wrote:
>> Dependency
>> ==========
>> Depends on USB patches, which are being reviewed, therefore marking it
>> as RFC as it cannot be applied.
>> https://lore.kernel.org/all/20260331-eliza-adsp-usb-v1-0-d8a251be20c3@oss.qualcomm.com/
>>
>> Unmerged bindings used here
>> ===========================
>> dispcc: https://lore.kernel.org/all/20260319-clk-qcom-dispcc-eliza-v3-0-d1f2b19a6e6b@oss.qualcomm.com/
>> (DRM MDSS bindings were applied)
>>
>> Description
>> ===========
>> I did not enable DisplayPort because it does not work on my board and I
>> don't know why. I double checked QMP combo phy and other bits, and
>> everything is looking fine, but still no USB display, so maybe I miss
>> some other dependencies as this is early upstream.
> 
> What was the furthest that you got? We can certainly try to help..
> 
> Got USB Type-C mode mux events?
> PHY initialized and configured to 2/4-lane DP mode?
> Are the AUX transfers failling?

[   43.975329] msm_dpu ae01000.display-controller: [drm:drm_dp_dpcd_access] dpu_dp_aux: Too many retries, giving up. First error: -110
[   43.975410] msm_dpu ae01000.display-controller: [drm:drm_dp_dpcd_probe] dpu_dp_aux: 0x00102 AUX -> (ret=-110)
[   45.780383] msm_dpu ae01000.display-controller: [drm:drm_dp_dpcd_access] dpu_dp_aux: Too many retries, giving up. First error: -110
[   45.780463] msm_dpu ae01000.display-controller: [drm:drm_dp_dpcd_probe] dpu_dp_aux: 0x00102 AUX -> (ret=-110)
[   45.780521] msm_dpu ae01000.display-controller: [drm:msm_dp_pm_runtime_suspend] type=10 core_init=1 phy_init=1

pastebin: https://pastebin.com/BVXy3Qeq

Abel pointed me to the phy problems, so I focused on that.
HSR says it is exactly same programming sequence as SM8650
and such was used.

Just note, that we have ADSP remoteproc up, but no audio including USB mux,
although that should not affect this, AFAIU.

Best regards,
Krzysztof