linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sdm845: Add cpu OPP tables

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Message-ID: <20200709142918.GA3521288@ripper>
Date:   Thu, 9 Jul 2020 07:29:18 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Steev Klimaszewski <steev@...i.org>
Cc:     Sibi Sankar <sibis@...eaurora.org>, viresh.kumar@...aro.org,
        sboyd@...nel.org, georgi.djakov@...aro.org, agross@...nel.org,
        robh+dt@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        saravanak@...gle.com, dianders@...omium.org,
        vincent.guittot@...aro.org, amit.kucheria@...aro.org,
        robdclark@...omium.org
Subject: Re: [PATCH v2] arm64: dts: qcom: sdm845: Add cpu OPP tables

On Wed 08 Jul 19:22 PDT 2020, Steev Klimaszewski wrote:

> 
> On 7/2/20 3:46 PM, Sibi Sankar wrote:
> > Add OPP tables required to scale DDR/L3 per freq-domain on SDM845 SoCs.
> >
> > Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
> > ---
> 
> 
> Hi Sibi,
> 
> 
> Bjorn asked me to give this patch a whirl, and I have to say, I like it
> but I'm not sure if I'm missing a dependency somewhere...
> 
> 
> In 5.8.0-rc4, I'm seeing a couple probe defers
> 
> [    0.131341] cpu cpu0: _allocate_opp_table: Error finding interconnect
> paths: -517
> 
> [    0.132694] cpu cpu4: _allocate_opp_table: Error finding interconnect
> paths: -517
> 
> And then a bit later on,
> 
> [    0.625837] cpu cpu0: failed to get clock: -2
> 
> 
> If these aren't anything to worry about, you can throw my Tested-by on
> 
> Tested-by: Steev Klimaszewski <steev@...i.org>
> 

You need to enable:
CONFIG_INTERCONNECT=y
CONFIG_INTERCONNECT_QCOM=y
CONFIG_INTERCONNECT_QCOM_OSM_L3=m
CONFIG_INTERCONNECT_QCOM_SDM845=m

With this I can see the interconnect_summary in debugfs change with the
CPU frequency.

Regards,
Bjorn