linux-kernel - Re: [PATCH v2 9/9] ARM: dts: qcom: msm8226-samsung-matisse-common: Enable modem

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Message-ID: <5638469.LvFx2qVVIh@lucaweiss.eu>
Date: Mon, 27 Jan 2025 14:34:08 +0100
From: Luca Weiss <luca@...aweiss.eu>
To: Stephan Gerhold <stephan.gerhold@...aro.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
 Bjorn Andersson <andersson@...nel.org>,
 Mathieu Poirier <mathieu.poirier@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Stephan Gerhold <stephan@...hold.net>,
 Konrad Dybcio <konradybcio@...nel.org>,
 Matti Lehtimäki <matti.lehtimaki@...il.com>,
 linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject:
 Re: [PATCH v2 9/9] ARM: dts: qcom: msm8226-samsung-matisse-common: Enable
 modem

On maandag 27 januari 2025 10:44:19 Midden-Europese standaardtijd Stephan 
Gerhold wrote:
> On Sun, Jan 26, 2025 at 09:57:28PM +0100, Luca Weiss wrote:
> > From: Matti Lehtimäki <matti.lehtimaki@...il.com>
> > 
> > Enable modem remoteproc on samsung,matisse-wifi & matisselte.
> > 
> > Signed-off-by: Matti Lehtimäki <matti.lehtimaki@...il.com>
> > Signed-off-by: Luca Weiss <luca@...aweiss.eu>
> > ---
> >  arch/arm/boot/dts/qcom/qcom-msm8226-samsung-matisse-common.dtsi | 7 +++++
++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/qcom/qcom-msm8226-samsung-matisse-
common.dtsi b/arch/arm/boot/dts/qcom/qcom-msm8226-samsung-matisse-common.dtsi
> > index fbd568c7d6b7415d240aa1a2329d07cf9135274c..
4155bfb2136022f2a85d69451c34f06ed2a700ac 100644
> > --- a/arch/arm/boot/dts/qcom/qcom-msm8226-samsung-matisse-common.dtsi
> > +++ b/arch/arm/boot/dts/qcom/qcom-msm8226-samsung-matisse-common.dtsi
> > @@ -225,6 +225,13 @@ &blsp1_uart3 {
> >  	status = "okay";
> >  };
> >  
> > +&modem {
> > +	mx-supply = <&pm8226_l3>;
> > +	pll-supply = <&pm8226_l8>;
> 
> Hmmmmm, so I was looking at msm8926.dtsi downstream and it seems to
> override the msm8226.dtsi modem/mss definition [1]:
> 
>  1. ext-bhs-reg is dropped
>  2. vdd_mss-supply is added

That's the same what I found, and have working with more (currently hacky) 
patches on msm8926-htc-memul. I decided against introducing it with this 
series since these patches have been pending for too long and initially when I 
was doing 8926, I wasn't sure how to make this into a proper patch. Now my 
idea is to introduce a "static const struct rproc_hexagon_res msm8926_mss" 
with the compatible qcom,msm8926-mss-pil which has these two differences.
I think that's a better idea than adding some extra conditionals around to 
make the mss-supply optional and ext-bhs somehow optional in the driver based 
on dt.

> 
> This common include seems to cover both apq8026 (matissewifi) and
> msm8926 (matisselte).

That's a very good point. I didn't think much about the matisse patches since 
they were introduced by Matti but yes... Either I add the msm8926 support in 
the same series already, or we just enable modem for matissewifi for now. I 
think I'll opt for the latter since the series is already 9 patches long and I 
don't want to make it too complicated.

> 
> Do we need to handle this difference?
> 
> First time I see such a difference between variants of a single SoC.
> Looking at all the overrides in msm8926.dtsi, it seems like they made
> quite some rework for the "LTE variant".

Yeah, no clue what they did here. But also I think Qualcomm stopped making a 
thousand different variants of the same SoC (*cough* msm8974), nowadays they 
"only" make different variants which get different letters and numbers 
(sc7280=qcm6490=sm7325 etc).

> 
> Thanks,
> Stephan
> 
> [1]: https://github.com/GalaxyTab4/android_kernel_samsung_matissewifi/blob/
45f97bab323176fead18c8ddc20dc57d979904a3/arch/arm/boot/dts/msm8226/
msm8926.dtsi#L32-L40
>