linux-kernel - Re: [PATCH v2] arm64/dts/qcom/sc7180: Add Display Port dt node

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Message-ID: <ef1879fa7ecfefaf0c70c7a4782240a9@codeaurora.org>
Date:   Mon, 07 Jun 2021 10:48:02 -0700
From:   khsieh@...eaurora.org
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     robdclark@...il.com, sean@...rly.run, swboyd@...omium.org,
        vkoul@...nel.org, agross@...nel.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, abhinavk@...eaurora.org,
        aravindh@...eaurora.org, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64/dts/qcom/sc7180: Add Display Port dt node

On 2021-06-05 22:07, Bjorn Andersson wrote:
> On Thu 03 Jun 16:56 CDT 2021, khsieh@...eaurora.org wrote:
> 
>> On 2021-06-03 09:53, Bjorn Andersson wrote:
>> > On Thu 03 Jun 11:09 CDT 2021, Kuogee Hsieh wrote:
> [..]
>> > > diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> [..]
>> > > +				power-domains = <&rpmhpd SC7180_CX>;
>> >
>> > Just curious, but isn't the DP block in the MDSS_GDCS? Or do we need to
>> > mention CX here in order for the opp framework to apply required-opps
>> > of CX?
>> 
>> yes,
> 
> If you want me, or other maintainers, to spend any time reviewing or
> applying your patches going forward then you need to actually bother
> replying properly to the questions asked.
> 
> Thanks,
> Bjorn

Sorry about the confusion. What I meant is that even though DP 
controller is in the MDSS_GDSC
power domain, DP PHY/PLL sources out of CX. The DP link clocks have a 
direct impact
on the CX voltage corners. Therefore, we need to mention the CX power 
domain here. And, since
we can associate only one OPP table with one device, we picked the DP 
link clock over other
clocks.