From: Boris Brezillon <boris.brezillon@bootlin.com>
To: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>,
Jonathan Corbet <corbet@lwn.net>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
Marek Vasut <marek.vasut@gmail.com>,
Tony Lindgren <tony@atomide.com>,
Aaro Koskinen <aaro.koskinen@iki.fi>,
linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org,
linux-mtd@lists.infradead.org, linux-doc@vger.kernel.org,
linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v2 05/12] mtd: rawnand: ams-delta: use GPIO API for data read/write
Date: Tue, 7 Aug 2018 19:06:27 +0200 [thread overview]
Message-ID: <20180807190627.4340aade@bbrezillon> (raw)
In-Reply-To: <20180806222918.12644-6-jmkrzyszt@gmail.com>
On Tue, 7 Aug 2018 00:29:11 +0200
Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> Don't readw()/writew() data directly from/to GPIO port which is under
> control of gpio-omap driver, use GPIO API instead.
>
> Degrade of performance on Amstrad Delta is completely not acceptable.
Can we have numbers along with information about where the overhead is
when using gpiod_{get,set}_raw_array_value()?
>
> The driver should work with any 8+-bit bidirectional GPIO port, not
> only OMAP.
That's cool!
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next prev parent reply other threads:[~2018-08-07 17:07 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180718235710.18242-1-jmkrzyszt@gmail.com>
2018-08-06 22:29 ` [RFC PATCH v2] mtd: rawnand: ams-delta: Use GPIO API for data I/O Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 01/12] mtd: rawnand: ams-delta: Assign mtd->dev.parent, not mtd->owner Janusz Krzysztofik
2018-08-06 23:54 ` Marek Vasut
2018-08-07 21:55 ` Janusz Krzysztofik
2018-08-07 16:57 ` Boris Brezillon
2018-08-06 22:29 ` [RFC PATCH v2 02/12] mtd: rawnand: ams-delta: Use private structure Janusz Krzysztofik
2018-08-07 16:59 ` Boris Brezillon
2018-08-06 22:29 ` [RFC PATCH v2 03/12] ARM: OMAP1: ams-delta: Provide GPIO lookup table for NAND data port Janusz Krzysztofik
2018-08-07 16:59 ` Boris Brezillon
2018-08-10 10:10 ` Linus Walleij
2018-08-06 22:29 ` [RFC PATCH v2 04/12] mtd: rawnand: ams-delta: request data port GPIO resource Janusz Krzysztofik
2018-08-07 17:00 ` Boris Brezillon
2018-08-10 10:11 ` Linus Walleij
2018-08-06 22:29 ` [RFC PATCH v2 05/12] mtd: rawnand: ams-delta: use GPIO API for data read/write Janusz Krzysztofik
2018-08-06 23:57 ` Marek Vasut
2018-08-07 17:06 ` Boris Brezillon [this message]
2018-08-07 17:11 ` Janusz Krzysztofik
2018-08-10 10:25 ` Linus Walleij
2018-08-06 22:29 ` [RFC PATCH v2 06/12] ARM: OMAP1: ams-delta: drop obsolete NAND resources Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 07/12] mtd: rawnand: ams-delta: Set port direction once per transfer Janusz Krzysztofik
2018-08-07 18:57 ` Boris Brezillon
2018-08-08 16:55 ` Janusz Krzysztofik
2018-08-08 17:42 ` Miquel Raynal
2018-08-06 22:29 ` [RFC PATCH v2 08/12] mtd: rawnand: ams-delta: Simplify pointer resolution on read/write Janusz Krzysztofik
2018-08-07 17:02 ` Boris Brezillon
2018-08-07 17:15 ` Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 09/12] gpiolib: Identify GPIO descriptor arrays with direct mapping Janusz Krzysztofik
2018-08-06 23:29 ` Linus Walleij
2018-08-07 16:50 ` Janusz Krzysztofik
2018-08-07 17:10 ` Boris Brezillon
2018-08-07 17:14 ` Boris Brezillon
2018-08-07 17:19 ` Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 10/12] gpiolib: Introduce bitmap get/set array API extension Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 11/12] mtd: rawnand: ams-delta: Use GPIO API bitmap extension Janusz Krzysztofik
2018-08-06 22:29 ` [RFC PATCH v2 12/12] gpiolib: Add fast processing path to bitmap API functions Janusz Krzysztofik
2018-08-06 23:43 ` Linus Walleij
2018-08-07 17:29 ` Janusz Krzysztofik
2018-08-07 17:47 ` Boris Brezillon
2018-08-10 10:55 ` Linus Walleij
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