linux-kernel - Re: [PATCH] phy: qualcomm: m31-eusb2: Add runtime pm ops

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Message-ID: <1c52e759-15fd-462b-a9fd-ad620da099f5@oss.qualcomm.com>
Date: Mon, 27 Oct 2025 16:39:34 +0530
From: Prashanth K <prashanth.k@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: qualcomm: m31-eusb2: Add runtime pm ops



On 10/27/2025 1:55 PM, Konrad Dybcio wrote:
> On 10/27/25 7:24 AM, Prashanth K wrote:
>> Add runtime power management operation callbacks for M31 EUSB2 PHY.
>> Enable/disable the clocks based on the runtime suspend/resume calls.
>>
>> Signed-off-by: Prashanth K <prashanth.k@....qualcomm.com>
>> ---
> 
> [...]
> 
>>  static int m31eusb2_phy_probe(struct platform_device *pdev)
>>  {
>>  	struct phy_provider *phy_provider;
>> @@ -270,6 +298,17 @@ static int m31eusb2_phy_probe(struct platform_device *pdev)
>>  		return dev_err_probe(dev, PTR_ERR(phy->clk),
>>  				     "failed to get clk\n");
>>  
>> +	dev_set_drvdata(dev, phy);
>> +	pm_runtime_set_active(dev);
>> +	pm_runtime_enable(dev);
>> +
>> +	/*
>> +	 * Prevent runtime pm from being ON by default. Users can enable
>> +	 * it using power/control in sysfs.
>> +	 */
>> +	pm_runtime_forbid(dev);
> 
> This screams "this patch is broken" or "there are bad issues" which
> you did not describe at all.
> 
> Konrad

Hi Konrad, I was followed the same sequence from other phy drivers
containing pm_ops. I assume the runtime_forbid is added to control
runtime pm from userspace.

Regards,
Prashanth K