linux-kernel - Re: [PATCH v4 4/5] arm64: dts: sdm845: Add OPP tables and power-domains for venus

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Message-ID: <3a5cc26b-7a77-33df-d8d2-edb46a72968a@linaro.org>
Date:   Fri, 24 Jul 2020 20:00:26 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Lina Iyer <ilina@...eaurora.org>,
        Rajendra Nayak <rnayak@...eaurora.org>
Cc:     robh+dt@...nel.org, agross@...nel.org, bjorn.andersson@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        mka@...omium.org, Maulik Shah <mkshah@...eaurora.org>
Subject: Re: [PATCH v4 4/5] arm64: dts: sdm845: Add OPP tables and
 power-domains for venus



On 7/24/20 7:52 PM, Stanimir Varbanov wrote:
> Hi Lina,
> 
> On 7/24/20 7:28 PM, Lina Iyer wrote:
>> On Fri, Jul 24 2020 at 03:03 -0600, Rajendra Nayak wrote:
>>> Hi Maulik/Lina,
>>>
>>> On 7/23/2020 11:36 PM, Stanimir Varbanov wrote:
>>>> Hi Rajendra,
>>>>
>>>> After applying 2,3 and 4/5 patches on linaro-integration v5.8-rc2 I see
>>>> below messages on db845:
>>>>
>>>> qcom-venus aa00000.video-codec: dev_pm_opp_set_rate: failed to find
>>>> current OPP for freq 533000097 (-34)
>>>>
>>>> ^^^ This one is new.
>>>>
>>>> qcom_rpmh TCS Busy, retrying RPMH message send: addr=0x30000
>>>>
>>>> ^^^ and this message is annoying, can we make it pr_debug in rpmh?
>>>
>> How annoyingly often do you see this message?
> 
> I haven't gig deeply but on every driver pm_runtime_suspend (after
> applying Rajendra's patches). And I guess it comes after a call to
> dev_pm_opp_set_rate(dev, 0).

Or it might be when the driver is switching off opp_pmdomain.

> 
> IMO this is too often.
> 
>> Usually, this is an indication of bad system state either on remote
>> processors in the SoC or in Linux itself. On a smooth sailing build you
>> should not see this 'warning'.
>>
>>> Would you be fine with moving this message to a pr_debug? Its currently
>>> a pr_info_ratelimited()
>> I would rather not, moving this out of sight will mask a lot serious
>> issues that otherwise bring attention to the developers.
>>
>> --Lina
> 

-- 
regards,
Stan