linux-kernel - Re: [PATCH v2 2/3] mmc: sunxi: Filter out unsupported modes declared in the device tree

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Message-ID: <20190206122008.ykldbk7kcfjfjxtv@flea>
Date:   Wed, 6 Feb 2019 13:20:08 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
        Chris Blake <chrisrblake93@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH v2 2/3] mmc: sunxi: Filter out unsupported modes declared
 in the device tree

On Tue, Feb 05, 2019 at 11:42:24PM +0800, Chen-Yu Tsai wrote:
> The MMC device tree bindings include properties used to signal various
> signalling speed modes. Until now the sunxi driver was accepting them
> without any further filtering, while the sunxi device trees were not
> actually using them.
> 
> Since some of the H5 boards can not run at higher speed modes stably,
> we are resorting to declaring the higher speed modes per-board.
> 
> Regardless, having boards declare modes and blindly following them,
> even without proper support in the driver, is generally a bad thing.
> 
> Filter out all unsupported modes from the capabilities mask after
> the device tree properties have been parsed.
> 
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>

Acked-by: Maxime Ripard <maxime.ripard@...tlin.com>

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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