linux-kernel - Re: [PATCH RFC 12/15] ARM: dts: sun9i: Use sun9i specific mmc compatible

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Message-ID: <CAGb2v671vypQxPcmnWa86ipCgRd0prqeTcTkbH_G+Q+AM71zFQ@mail.gmail.com>
Date:	Sat, 23 Jan 2016 18:50:40 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Chen-Yu Tsai <wens@...e.org>, Ulf Hansson <ulf.hansson@...aro.org>,
	Hans de Goede <hdegoede@...hat.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH RFC 12/15] ARM: dts: sun9i: Use sun9i specific mmc compatible

On Sat, Jan 23, 2016 at 4:44 AM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> On Thu, Jan 21, 2016 at 01:26:39PM +0800, Chen-Yu Tsai wrote:
>> sun9i/A80 MMC controllers have a larger FIFO, and the FIFO DMA
>> trigger levels can be increased. Also, the mmc module clock parent
>> has a higher clock rate, and the sample and output delay phases
>> are different.
>>
>> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
>
> Applied, thanks!
>
> Does that count as a fix, or does the A80 board can safely operate
> without it?

The compatible was added in v4.3, in commit 51424b286067 ("mmc:
sunxi: Fix clk-delay settings").

I've not tested using the old compatibles with 50/52 MHz DDR. They
do work just fine with the transfer modes we already supported.

Either way its been there for a while so i don't see any need to
pick it out as a fix.

ChenYu