linux-kernel - Re: [PATCH v5 2/6] spi: spi-geni-qcom: Use OPP API to set clk/perf state

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Date:   Thu, 14 May 2020 10:33:40 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     viresh.kumar@...aro.org, sboyd@...nel.org, agross@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        mka@...omium.org, Mark Brown <broonie@...nel.org>,
        Alok Chauhan <alokc@...eaurora.org>,
        Akash Asthana <akashast@...eaurora.org>,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH v5 2/6] spi: spi-geni-qcom: Use OPP API to set clk/perf
 state


[]..

>>   
>>   	spi->bus_num = -1;
>>   	spi->dev.of_node = dev->of_node;
>> @@ -596,6 +607,9 @@ static int spi_geni_probe(struct platform_device *pdev)
>>   spi_geni_probe_runtime_disable:
>>   	pm_runtime_disable(dev);
>>   	spi_master_put(spi);
>> +	if (mas->se.has_opp_table)
> 
> Why do you need has_opp_table?
> 
> Afaict if dev_pm_opp_of_add_table() returns -ENODEV there's no attached
> opp-table and dev_pm_opp_of_remove_table() is a nop.

Apparently its not. Calling dev_pm_opp_of_remove_table() when dev_pm_opp_of_add_table()
failed causes use-count mismatch.
You can see https://lkml.org/lkml/2020/4/15/18 for more details.

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