Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array

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To: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Subject: Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
From: Linus Walleij <linus.walleij@xxxxxxxxxx>
Date: Thu, 20 Sep 2018 08:49:04 -0700
Cc: Janusz Krzysztofik <jmkrzyszt@xxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Miguel Ojeda Sandonis <miguel.ojeda.sandonis@xxxxxxxxx>, Peter Korsgaard <peter.korsgaard@xxxxxxxxx>, Peter Rosin <peda@xxxxxxxxxx>, Ulf Hansson <ulf.hansson@xxxxxxxxxx>, Andrew Lunn <andrew@xxxxxxx>, Florian Fainelli <f.fainelli@xxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>, kishon@xxxxxx, Lars-Peter Clausen <lars@xxxxxxxxxx>, Michael Hennerich <Michael.Hennerich@xxxxxxxxxx>, Jonathan Cameron <jic23@xxxxxxxxxx>, Hartmut Knaack <knaack.h@xxxxxx>, Peter Meerwald <pmeerw@xxxxxxxxxx>, Jiri Slaby <jslaby@xxxxxxxx>, Willy Tarreau <w@xxxxxx>, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, linux-i2c@xxxxxxxxxxxxxxx, linux-mmc <linux-mmc@xxxxxxxxxxxxxxx>, netdev <netdev@xxxxxxxxxxxxxxx>, linux-iio@xxxxxxxxxxxxxxx, devel@xxxxxxxxxxxxxxxxxxxx, linux-serial@xxxxxxxxxxxxxxx, "open list:GPIO SUBSYSTEM" <linux-gpio@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Sebastien Bourdelin <sebastien.bourdelin@xxxxxxxxxxxxxxxxxxxx>, Lukas Wunner <lukas@xxxxxxxxx>, Rojhalat Ibrahim <imr@xxxxxxxxxxx>, Russell King <rmk+kernel@xxxxxxxxxxxxxxx>, ext Tony Lindgren <tony@xxxxxxxxxxx>, Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx>, Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>, linux-samsung-soc <linux-samsung-soc@xxxxxxxxxxxxxxx>, Krzysztof Kozlowski <krzk@xxxxxxxxxx>
In-reply-to: <20180920101151eucas1p221f5a1715b8556bb9d99bf08fe09ce6f~WE-_cEf4l0754207542eucas1p27@eucas1p2.samsung.com>
References: <20180831225616.29221-1-jmkrzyszt@gmail.com> <20180902120144.6855-1-jmkrzyszt@gmail.com> <CGME20180920101151eucas1p221f5a1715b8556bb9d99bf08fe09ce6f@eucas1p2.samsung.com> <20180902120144.6855-5-jmkrzyszt@gmail.com> <20180920101151eucas1p221f5a1715b8556bb9d99bf08fe09ce6f~WE-_cEf4l0754207542eucas1p27@eucas1p2.samsung.com>

On Thu, Sep 20, 2018 at 3:11 AM Marek Szyprowski
<m.szyprowski@xxxxxxxxxxx> wrote:

> I've just noticed that this patch landed in today's linux-next. Sadly it
> breaks booting of Exynos5250-based Samsung Snow Chromebook (ARM 32bit,
> device-tree source arch/arm/boot/dts/exynos5250-snow.dts).

Thanks for testing on this platform!

> Booting hangs after detecting MMC cards. Reverting this patch fixes the
> boot. I will try later to add some debugs and investigate it further what
> really happens when booting hangs.

How typical. I hope we can fix it, because this should mean speedups
for your platform.

Yours,
Linus Walleij

References:
- [PATH v6 0/4] gpiolib: speed up GPIO array processing
  - From: Janusz Krzysztofik
- [PATCH v7 0/4] gpiolib: speed up GPIO array processing
  - From: Janusz Krzysztofik
- [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
  - From: Janusz Krzysztofik
- Re: [PATCH v7 4/4] gpiolib: Implement fast processing path in get/set array
  - From: Marek Szyprowski

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