linux-kernel - Re: [PATCH] soc: qcom: pmic_glink_altmode: fix spurious DP hotplug events

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Message-ID: <Z-zjfLyRjPplXLHV@hovoldconsulting.com>
Date: Wed, 2 Apr 2025 09:13:00 +0200
From: Johan Hovold <johan@...nel.org>
To: Clayton Craft <clayton@...ftyguy.net>
Cc: Johan Hovold <johan+linaro@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] soc: qcom: pmic_glink_altmode: fix spurious DP hotplug
 events

On Tue, Apr 01, 2025 at 11:18:49AM -0700, Clayton Craft wrote:
> On 3/26/25 07:43, Johan Hovold wrote:
> > On Tue, Mar 25, 2025 at 09:32:10AM +0100, Johan Hovold wrote:

> >> I didn't realise you were also using a display/dock. Bjorn mentioned
> >> that he has noticed issues with one of his monitors (e.g. built-in hub
> >> reenumerating repeatedly iirc) which may be related.
> 
> Sorry for the confusion, let me clarify:
> 
> The original issue I reported to you on IRC was *without* a 
> dock/external display attached, only a PD adapter was attached. With 
> your patch, I no longer see these drm hotplug events in this scenario.
> 
> After confirming that your patch resolved the spurious hotplug events 
> when using a PD charger, I connected a dock+external display to see if 
> the patch caused any regressions there for me. It was here that I 
> noticed a periodic hotplug event firing 2 times every 30 seconds was 
> still showing up. I don't know if this is expected or not, I've never 
> noticed it before because I wasn't monitoring udev events.

Got it, thanks for clarifying.

Did you get a chance to try the patch enabling UCSI and USB-PD? That one
may possibly help with the dock issue:

	https://lore.kernel.org/lkml/20250326124944.6338-1-johan+linaro@kernel.org/

> >> Did it help with the display flickering too? Was that only on the
> >> external display?
> 
> The flickering was only on the internal display, and your patch here 
> seems to have resolved that.

Good. Is there any flickering on either screen when you see the spurious
HP events with the dock?

Johan