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

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Date:   Sat, 5 Dec 2020 22:42:30 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Amjad Ouled-Ameur <aouledameur@...libre.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

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/