[RFC v2 0/2] Add device tree property and driver behavior for supporting sdhci configurations with broken highspeed.

From	Zach Brown <zach.brown@ni.com>
Newsgroups	linux.kernel
Subject	[RFC v2 0/2] Add device tree property and driver behavior for supporting sdhci configurations with broken highspeed.
Date	2016-10-12 20:50 +0200
Message-ID	<srwLf-8fi-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Some board configurations can not support sd highspeed mode due to the distance
between the card slot and the controller. The card and controller report that
they are capable of highspeed however, so we need a mechanism for specifying
that the setup is incapable of supporting highspeed mode.

The first patch adds documentation about a new devicetree property
sd-broken-highspeed.

The second patch keeps the sd controller and card from going into highspeed
mode when the property is set.

v2:
 * changed sd-broken-highspeed to broken-highspeed
 * Removed new quirk, instead read of property when would've checked quirk

Zach Brown (2):
  sdhci: Add device tree property broken-highspeed
  sdhci: Prevent SD from doing high-speed timing when broken-highspeed
    property is set

 Documentation/devicetree/bindings/mmc/mmc.txt | 2 ++
 drivers/mmc/host/sdhci.c                      | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

--
2.7.4

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[RFC v2 0/2] Add device tree property and driver behavior for supporting sdhci configurations with broken highspeed. Zach Brown <zach.brown@ni.com> - 2016-10-12 20:50 +0200
  [RFC v2 2/2] sdhci: Prevent SD from doing high-speed timing when broken-highspeed property is set Zach Brown <zach.brown@ni.com> - 2016-10-12 20:50 +0200
    Re: [RFC v2 2/2] sdhci: Prevent SD from doing high-speed timing when  broken-highspeed property is set Adrian Hunter <adrian.hunter@intel.com> - 2016-10-17 09:10 +0200

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