linux-kernel - Re: [PATCH 1/2] clk: qcom: gcc-sm6375: Update the .pwrsts for usb gdsc

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Date:   Mon, 6 Mar 2023 23:36:35 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Stephen Boyd <sboyd@...nel.org>, agross@...nel.org,
        andersson@...nel.org, linux-arm-msm@...r.kernel.org
Cc:     marijn.suijten@...ainline.org,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] clk: qcom: gcc-sm6375: Update the .pwrsts for usb
 gdsc



On 6.03.2023 20:35, Stephen Boyd wrote:
> Quoting Konrad Dybcio (2023-03-02 18:29:11)
>> The USB controller on sm6375 doesn't retain its state when the system
>> goes into low power state and the GDSCs are turned off.
>>
>> This can be observed by the USB connection not coming back alive after
>> putting the device into suspend, essentially breaking USB.
>>
>> Fix this by updating the .pwrsts for the USB GDSCs so they only
>> transition to retention state in low power.
> 
> Is this a temporary fix? Is that why there isn't a Fixes tag?
Yeah AFAIU the upstream dwc3-qcom driver is not fully implemented
on the suspend front.

If it's a
> workaround then please add a TODO comment indicating the USB driver
> doesn't work properly.
Will do!

Konrad