linux-kernel - Re: [PATCH] soc: qcom: pmic_glink: fix connector type to be DisplayPort

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Message-ID: <EeTPIPMpLMJf5ZaAnmfLL8a1MUy4DRxST6oU_-N44pa3XfyglLs_sWXdnOvjJLTzahjZhkRqWIO9TwXj4bhSKwBIUYkuIufXms2UjZ7MJjA=@emersion.fr>
Date:   Wed, 25 Oct 2023 12:54:44 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: qcom: pmic_glink: fix connector type to be DisplayPort

On Wednesday, October 25th, 2023 at 14:45, Dmitry Baryshkov <dmitry.baryshkov@...aro.org> wrote:

> On 25/10/2023 15:29, Simon Ser wrote:
> 
> > On Wednesday, October 25th, 2023 at 14:22, Johan Hovold johan@...nel.org wrote:
> > 
> > > I was just going to post a patch fixing this after finally investigating
> > > why the DisplayPort outputs on the X13s were annoyingly identified as
> > > "Unknown20-1" and "Unknown20-2" instead of the expected "DP-1" and
> > > "DP-2".
> > 
> > Note, ideally userspace should use drmModeGetConnectorTypeName() from
> > libdrm to figure out the proper name for a connector type. That way we
> > only need to update a single spot when adding a new connector type,
> > instead of patching a whole bunch of programs.
> 
> X11 does its own thing. It further "renames" DP MST connectors. So on my
> laptop I end up with DP-1-1 in xrandr, but DP-3 in kernel.

Right. But that function only takes in a connector type enum as input,
and returns a string for the type only. It doesn't include the suffix
with the number.

IOW: xserver could use drmModeGetConnectorTypeName() and then append
"-2" or "-1-1" or whatever.

But with the current appetite for xserver development this is probably
not going to happen (and doesn't matter very much).