mmc: sdhci-pci: Fix card detect race for Intel BXT/APL

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commit 163cbe31e5 upstream.

Intel BXT/APL use a card detect GPIO however the host controller
will not enable bus power unless it's card detect also reflects
the presence of a card.  Unfortunately those 2 things race which
can result in commands not starting, after which the controller
does nothing and there is a 10 second wait for the driver's
10-second timer to timeout.

That is fixed by having the driver look also at the present state
register to determine if the card is present.  Consequently, provide
a 'get_cd' mmc host operation for BXT/APL that does that.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Adrian Hunter 2016-02-09 16:12:37 +02:00 • committed by Greg Kroah-Hartman

parent b7f7a5e2e9

commit dfca191876

1 changed files with 31 additions and 0 deletions

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drivers/mmc/host/sdhci-pci-core.c

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