Re: glymur eDP PHY (v8): link trains only at HBR3, all lower rates fail

[Konrad Dybcio]

On 8/8/26 7:13 PM, Jesse Casco wrote:
> Hi Abel,
> 
> On an ASUS Zenbook A16 (UX3607OA, Snapdragon X2 Elite Extreme) the internal
> eDP panel never comes up on mainline. It is the link rate: the v8 eDP PHY
> appears to bring up a usable link only at HBR3.
> 
> Tested on linux-next next-20260713, next-20260803 and next-20260807, where
> phy-qcom-edp.c is byte-identical -- so not a recent regression, and the May
> 2026 series (eDP low-vdiff LDO config, unified swing/pre-emphasis tables,
> eDP/DP mode switch) is present in the tree tested here. The sweep below is
> from next-20260803; the machine has since run next-20260807 as its daily
> driver, where HBR3 still trains every boot.

I mentioned in my submission that this series is required on top:

https://lore.kernel.org/linux-arm-msm/20260622-glymur-edp-phy-v1-0-814b45089ac9@xxxxxxxxxxxxxxxx/

Konrad