From: Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
Cc: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
Alexandre Courbot
<gnurou-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] ARM: tegra: beaver: allow SD card voltage to be changed
Date: Fri, 13 May 2016 19:27:04 +0200 [thread overview]
Message-ID: <20160513172704.GA498@ulmo.ba.sec> (raw)
In-Reply-To: <1463124331.2459.0.camel-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
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On Fri, May 13, 2016 at 09:25:31AM +0200, Lucas Stach wrote:
> Am Montag, den 29.02.2016, 22:01 +0100 schrieb Lucas Stach:
> > This allows to switch the card signal voltage level to 1.8V,
> > which is needed for any ultra high speed modes to work.
> >
> > Signed-off-by: Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
> > ---
> > This needs the SDMMC memcomp pad calibration patches I just
> > sent out to be applied, otherwise the card voltage change will
> > fail with a message in the kernel log and a fall back to
> > high speed operation.
>
> The patches this one depends on have been applied for some time now.
> Please pick up this patch.
My understanding is that UHS modes currently cause problems on Beaver.
What I don't understand about that is how it will even try those modes
if the voltage regulator can't be set to 1.8 V? Shouldn't that actively
prevent those modes from even being attempted?
Thierry
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From: thierry.reding@gmail.com (Thierry Reding)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: tegra: beaver: allow SD card voltage to be changed
Date: Fri, 13 May 2016 19:27:04 +0200 [thread overview]
Message-ID: <20160513172704.GA498@ulmo.ba.sec> (raw)
In-Reply-To: <1463124331.2459.0.camel@lynxeye.de>
On Fri, May 13, 2016 at 09:25:31AM +0200, Lucas Stach wrote:
> Am Montag, den 29.02.2016, 22:01 +0100 schrieb Lucas Stach:
> > This allows to switch the card signal voltage level to 1.8V,
> > which is needed for any ultra high speed modes to work.
> >
> > Signed-off-by: Lucas Stach <dev@lynxeye.de>
> > ---
> > This needs the SDMMC memcomp pad calibration patches I just
> > sent out to be applied, otherwise the card voltage change will
> > fail with a message in the kernel log and a fall back to
> > high speed operation.
>
> The patches this one depends on have been applied for some time now.
> Please pick up this patch.
My understanding is that UHS modes currently cause problems on Beaver.
What I don't understand about that is how it will even try those modes
if the voltage regulator can't be set to 1.8 V? Shouldn't that actively
prevent those modes from even being attempted?
Thierry
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next prev parent reply other threads:[~2016-05-13 17:27 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 21:01 [PATCH] ARM: tegra: beaver: allow SD card voltage to be changed Lucas Stach
2016-02-29 21:01 ` Lucas Stach
[not found] ` <1456779678-20173-1-git-send-email-dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
2016-05-13 7:25 ` Lucas Stach
2016-05-13 7:25 ` Lucas Stach
[not found] ` <1463124331.2459.0.camel-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
2016-05-13 17:27 ` Thierry Reding [this message]
2016-05-13 17:27 ` Thierry Reding
[not found] ` <20160513172704.GA498-EkSeR96xj6Pcmrwk2tT4+A@public.gmane.org>
2016-05-13 19:08 ` Lucas Stach
2016-05-13 19:08 ` Lucas Stach
2016-05-19 14:29 ` Jon Hunter
2016-05-19 14:29 ` Jon Hunter
[not found] ` <573DCDB3.80202-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-06-13 10:22 ` Jon Hunter
2016-06-13 10:22 ` Jon Hunter
[not found] ` <575E897A.5080508-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-06-14 6:20 ` Adrian Hunter
2016-06-14 6:20 ` Adrian Hunter
[not found] ` <575FA21E.80309-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2016-06-14 8:23 ` Jon Hunter
2016-06-14 8:23 ` Jon Hunter
[not found] ` <575FBEE5.50905-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-06-14 10:05 ` Adrian Hunter
2016-06-14 10:05 ` Adrian Hunter
[not found] ` <575FD6E0.7070201-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2016-06-14 14:19 ` Jon Hunter
2016-06-14 14:19 ` Jon Hunter
[not found] ` <5760125A.8030102-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-06-24 9:14 ` Jon Hunter
2016-06-24 9:14 ` Jon Hunter
[not found] ` <576CF9F3.7090406-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-06-28 13:27 ` Adrian Hunter
2016-06-28 13:27 ` Adrian Hunter
2016-05-19 14:31 ` Jon Hunter
2016-05-19 14:31 ` Jon Hunter
[not found] ` <573DCE43.70906-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-05-19 16:12 ` Stephen Warren
2016-05-19 16:12 ` Stephen Warren
-- strict thread matches above, loose matches on Subject: below --
2016-06-30 15:32 [PATCH] ARM: tegra: beaver: Allow " Thierry Reding
[not found] ` <20160630153208.22761-1-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-07-07 5:22 ` Olof Johansson
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