* UHS Support
@ 2012-05-18 4:03 Philip Rakity
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From: Philip Rakity @ 2012-05-18 4:03 UTC (permalink / raw)
To: linux-mmc; +Cc: Aaron Lu, Arindam Nath
Voltage for vcc/vccq is supplied on some of our boards for SD using either a dedicated voltage supply at 3.3v.
The SD controller indicates in the capability1 register (caps[1]) that UHS is supported but since 1.8v is not available in practice there is no support.
There are two ways I can see to solve this problem
a) allow caps[1] to be passed in (like caps[0]) is today via a quirk) and have the caller to sdhci_add_host() just clear the bits for UHS support.
b) define a new quirk that indicates UHS is not supported.
I favor a) but wanted the list to have a chance to respond if there is a preference.
Philip
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2012-05-18 4:03 UHS Support Philip Rakity
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