linux-kernel - Re: [PATCH v2 2/3] usb: dwc3: meson-g12a: fix shared reset control use

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Date:   Thu, 10 Dec 2020 18:35:19 +0100
From:   Amjad Ouled-Ameur <aouledameur@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Kevin Hilman <khilman@...libre.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-amlogic@...ts.infradead.org,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH v2 2/3] usb: dwc3: meson-g12a: fix shared reset control
 use

Hi Martin


On 05/12/2020 22:42, Martin Blumenstingl wrote:

>    
> Hello Amjad,
>
> On Tue, Dec 1, 2020 at 8:01 PM Amjad Ouled-Ameur
> <aouledameur@...libre.com> wrote:
>    
>> reset_control_(de)assert() calls are called on a shared reset line when
>> reset_control_reset has been used. This is not allowed by the reset
>> framework.
>>
>> Use reset_control_rearm() call in suspend() and remove() as a way to state
>> that the resource is no longer used, hence the shared reset line
>> may be triggered again by other devices. Use reset_control_rearm() also in
>> case probe fails after reset() has been called.
>>
>> reset_control_rearm() keeps use of triggered_count sane in the reset
>> framework, use of reset_control_reset() on shared reset line should be
>> balanced with reset_control_rearm().
>    
> I think this should be updated after [0] is applied
> The goto from that patch needs to use err_rearm from this patch.
>
>
> Best regards,
> Martin
>
>
> [0] https://patchwork.kernel.org/project/linux-usb/patch/20201111095256.10477-1-zhengzengkai@huawei.com/

Thank you Martin for reviewing this patchset.

I have reviewed the patch you mentioned, and I think as well that
we should use 'err_rearm' instead of 'err_disable_clks' to
cleanup things properly in case setup_regmaps fails.


Best,

Amjad