linux-kernel - input: ps2-gpio: use ktime for IRQ timekeeping

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Message-Id: <20220211212258.80345-1-danilokrummrich@dk-develop.de>
Date:   Fri, 11 Feb 2022 22:22:55 +0100
From:   Danilo Krummrich <danilokrummrich@...develop.de>
To:     dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linus.walleij@...aro.org
Subject: input: ps2-gpio: use ktime for IRQ timekeeping

This patch series implements the usage of ktime for IRQ timekeeping to
overcome:

(1) The resolution limitations of jiffies.
(2) Potential spurious IRQs generated by gpio controllers.

Besides that, based on the newly implemented timekeeping, it fixes a wrongly
suspected extra clock cycle for TX transfers and a race condition when
starting an immediate TX transfer based on data received from an RX transfer.