From: Maxime Ripard <maxime.ripard@free-electrons.com>
To: Florian Vaussard <florian.vaussard@heig-vd.ch>
Cc: Chen-Yu Tsai <wens@csie.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
devicetree@vger.kernel.org,
Andre Przywara <andre.przywara@arm.com>,
linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
Rob Herring <robh+dt@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4 10/13] arm64: allwinner: a64: Increase the MMC max frequency
Date: Fri, 27 Jan 2017 22:26:11 +0100 [thread overview]
Message-ID: <20170127212611.rn2nr4fihshud2qg@lukather> (raw)
In-Reply-To: <6c6bf169-4b2e-6b55-54db-d21da73a8f6e@heig-vd.ch>
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On Fri, Jan 27, 2017 at 11:29:53AM +0100, Florian Vaussard wrote:
> Hi Maxime,
>
> On 01/26/2017 10:06 AM, Maxime Ripard wrote:
> > The eMMC controller seem to have a maximum frequency of 200MHz, while the
> > regular MMC controllers are capped at 150MHz.
> >
> > Since older SoCs cannot go that high, we cannot change the default maximum
> > frequency, but fortunately for us we have a property for that in the DT.
> >
> > This also has the side effect of allowing to use the MMC HS200 and SD
> > SDR104 modes for the boards that support it (with either 1.2v or 1.8v IOs).
> >
> > Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> >
> > arm64: allwinner: a64: Limit MMC0 and MMC1 rates to 150MHz
> >
> > Trying to set the bus to 200MHz on MMC1 when doing SDIO is failing.
> > Allwinner sets the maximum for this bus to 150MHz, so enforce that limit.
> >
> > This hasn't been tested with MMC0, but the documented limit is the same,
> > and I expect the behaviour to be the same.
> >
> > Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
>
> I suspect that you are trying to increase your number of Signed-off-by tags by
> using unfair means :) Otherwise the squashed commit message is probably worth
> some cleaning.
/me hides in a corner...
The first commit log is the right one, I'll remove the second.
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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next prev parent reply other threads:[~2017-01-27 21:27 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-26 9:05 [PATCH v4 0/13] arm64: allwinner: a64: Enable MMC support Maxime Ripard
2017-01-26 9:05 ` [PATCH v4 1/13] mmc: sunxi: Fix clock frequency change sequence Maxime Ripard
2017-01-26 9:05 ` [PATCH v4 2/13] mmc: sunxi: Gate the clock when rate is 0 Maxime Ripard
2017-01-26 9:05 ` [PATCH v4 3/13] mmc: sunxi: Always set signal delay to 0 for A64 Maxime Ripard
2017-01-26 9:05 ` [PATCH v4 4/13] mmc: sunxi: Enable the new timings for the A64 MMC controllers Maxime Ripard
2017-01-26 9:05 ` [PATCH v4 5/13] mmc: sunxi: Mask DATA0 when updating the clock Maxime Ripard
2017-01-26 9:05 ` [PATCH v4 6/13] mmc: sunxi: Add EMMC (MMC2) controller compatible Maxime Ripard
2017-01-26 9:06 ` [PATCH v4 7/13] mmc: sunxi: Add more debug informations Maxime Ripard
2017-01-26 9:06 ` [PATCH v4 8/13] arm64: allwinner: a64: Add MMC nodes Maxime Ripard
2017-01-26 9:06 ` [PATCH v4 9/13] arm64: allwinner: a64: Add MMC pinctrl nodes Maxime Ripard
2017-01-26 9:06 ` [PATCH v4 10/13] arm64: allwinner: a64: Increase the MMC max frequency Maxime Ripard
2017-01-27 10:29 ` Florian Vaussard
2017-01-27 21:26 ` Maxime Ripard [this message]
2017-01-26 9:06 ` [PATCH v4 11/13] arm64: allwinner: pine64: add MMC support Maxime Ripard
2017-01-26 9:06 ` [PATCH v4 12/13] arm64: allwinner: a64: add UART1 pin nodes Maxime Ripard
2017-01-26 9:06 ` [PATCH v4 13/13] arm64: allwinner: add BananaPi-M64 support Maxime Ripard
2017-01-27 10:37 ` [PATCH v4 0/13] arm64: allwinner: a64: Enable MMC support Florian Vaussard
2017-01-27 21:27 ` Maxime Ripard
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