Re: [PATCH v5 00/10] drm/msm/dp: Drop the HPD state machine

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 3/18/26 12:15 AM, Val Packett wrote:
> 
> On 3/16/26 12:23 AM, Dmitry Baryshkov wrote:
>> On Sat, Mar 14, 2026 at 10:10:26PM -0300, Val Packett wrote:
>>> On 3/14/26 9:51 PM, Val Packett wrote:
>>>> On 3/13/26 10:09 PM, Dmitry Baryshkov wrote:
>>>>> Currently, all HPD interrupt handling must go through the HPD state
>>>>> machine.
>>>>>
>>>>> This has caused many issues where the DRM framework assumes that DP is
>>>>> in one state while the state machine is stuck in another state.
>>>>>
>>>>> As discussed here [1], this series:

[...]

> [ 3362.364893] typec_displayport port1-partner.1: failed to create symlinks
> [ 3362.364902] typec_displayport port1-partner.1: probe with driver typec_displayport failed with error -17

I believe this happens when the PAN_ACK doesn't arrive in time

i.e. if pmic_glink_altmode.c doesn't write ALTMODE_PAN_ACK to
the Type-C service, which is influenced by the time it takes
for all the typec_mux_set() and typec_retimer_set() callbacks in
the chain to complete (which are called by the various flavors of
pmic_glink_altmode_enable_xyz() in pmic_glink_altmode_worker()
right before the ack)

Konrad