linux-kernel - Re: [PATCH] reset: Add reset controller API

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Date:   Fri, 02 Oct 2020 16:00:20 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Amjad Ouled-Ameur <aouledameur@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Amjad Ouled-Ameur <aouledameur@...libre.com>,
        linux-kernel@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-usb@...r.kernel.org, Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH] reset: Add reset controller API

Amjad Ouled-Ameur <aouledameur@...libre.com> writes:

> The current reset framework API does not allow to release what is done by
> reset_control_reset(), IOW decrement triggered_count. Add the new
> reset_control_resettable() call to do so.
>
> When reset_control_reset() has been called once, the counter
> triggered_count, in the reset framework, is incremented i.e the resource
> under the reset is in-use and the reset should not be done again.
> reset_control_resettable() would be the way to state that the resource is 
> no longer used and, that from the caller's perspective, the reset can be 
> fired again if necessary.
>
> This patch will fix a usb suspend warning seen on the libretech-cc
> related to the shared reset line. This warning was addressed by the 
> previously reverted commit 7a410953d1fb ("usb: dwc3: meson-g12a: fix shared
> reset control use")

Could you also send a patch that shows how your new feature can be used
to fix the problem that was originally fixed by that patch (and still
exists, now that it was reverted.)

Thanks,

Kevin