From: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
To: Ulf Hansson <ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Andre Przywara <andre.przywara-5wv7dgnIgG8@public.gmane.org>
Subject: Re: [PATCH v3 3/13] mmc: sunxi: Always set signal delay to 0 for A64
Date: Wed, 25 Jan 2017 10:10:34 +0100 [thread overview]
Message-ID: <20170125091034.2cwnq7g72fndhuqz@lukather> (raw)
In-Reply-To: <CAPDyKFoatUWz0AwY6e73OCguDx70B1B5OAoPUYX-JDPsru+aZw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
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Hi Ulf,
On Tue, Jan 24, 2017 at 09:16:12AM +0100, Ulf Hansson wrote:
> On 16 January 2017 at 17:56, Maxime Ripard
> <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> wrote:
> > Experience have shown that the using the autocalibration could severely
> > degrade the performances of the MMC bus.
> >
> > Allwinner is using in its BSP a delay set to 0 for all the modes but HS400.
> > Remove the calibration code for now, and add comments to document our
> > findings.
>
> So doesn't this break some platforms using HS400? Or are you saying
> those are already broken?
Like Andre said, HS400 isn't supported at all, so there's no
regression or brokenness involved :)
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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next prev parent reply other threads:[~2017-01-25 9:10 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-16 16:56 [PATCH v3 0/13] arm64: allwinner: a64: Enable MMC support Maxime Ripard
2017-01-16 16:56 ` [PATCH v3 1/13] mmc: sunxi: Fix clock frequency change sequence Maxime Ripard
2017-01-24 8:12 ` Ulf Hansson
2017-01-25 8:26 ` Maxime Ripard
2017-01-16 16:56 ` [PATCH v3 2/13] mmc: sunxi: Gate the clock when rate is 0 Maxime Ripard
[not found] ` <1f006fd86d1d9ad5eab0c0c9e435003055466a54.1484585798.git-series.maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2017-01-24 8:14 ` Ulf Hansson
2017-01-16 16:56 ` [PATCH v3 3/13] mmc: sunxi: Always set signal delay to 0 for A64 Maxime Ripard
2017-01-24 8:16 ` Ulf Hansson
2017-01-24 9:15 ` Andre Przywara
[not found] ` <CAPDyKFoatUWz0AwY6e73OCguDx70B1B5OAoPUYX-JDPsru+aZw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-01-25 9:10 ` Maxime Ripard [this message]
2017-01-16 16:56 ` [PATCH v3 4/13] mmc: sunxi: Enable the new timings for the A64 MMC controllers Maxime Ripard
2017-01-16 16:56 ` [PATCH v3 5/13] mmc: sunxi: Mask DATA0 when updating the clock Maxime Ripard
2017-01-24 8:18 ` Ulf Hansson
2017-01-25 9:16 ` Maxime Ripard
2017-01-16 16:56 ` [PATCH v3 6/13] mmc: sunxi: Add EMMC (MMC2) controller compatible Maxime Ripard
2017-01-16 16:56 ` [PATCH v3 7/13] mmc: sunxi: Add more debug messages Maxime Ripard
2017-01-24 8:22 ` Ulf Hansson
2017-01-25 9:16 ` Maxime Ripard
2017-01-16 16:56 ` [PATCH v3 8/13] arm64: allwinner: a64: Add MMC nodes Maxime Ripard
2017-01-16 19:16 ` Corentin Labbe
2017-01-25 9:17 ` Maxime Ripard
2017-01-16 16:56 ` [PATCH v3 9/13] arm64: allwinner: a64: Add MMC pinctrl nodes Maxime Ripard
2017-01-16 16:57 ` [PATCH v3 10/13] arm64: allwinner: a64: Increase the MMC max frequency Maxime Ripard
2017-01-16 16:57 ` [PATCH v3 11/13] arm64: allwinner: pine64: add MMC support Maxime Ripard
[not found] ` <cover.a06ce1672d7a72ee7f9bbca46fdd223edd6b2313.1484585798.git-series.maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
2017-01-16 16:57 ` [PATCH v3 12/13] arm64: allwinner: a64: add UART1 pin nodes Maxime Ripard
2017-01-16 16:57 ` [PATCH v3 13/13] arm64: allwinner: add BananaPi-M64 support Maxime Ripard
2017-01-23 10:58 ` [PATCH v3 0/13] arm64: allwinner: a64: Enable MMC support Maxime Ripard
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