sdhci: Add support for card-detection polling

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This patch adds SDHCI_QUIRK_BROKEN_CARD_DETECTION quirk. When specified,
sdhci driver will set MMC_CAP_NEEDS_POLL MMC host capability, and won't
enable card insert/remove interrupts.

This is needed for hosts with unreliable card detection, such as FSL
eSDHC. The original eSDHC driver was tring to "debounce" card-detection
IRQs by reading present state and disabling particular interrupts. But
with this debouncing scheme I noticed that sometimes we miss card
insertion/removal events.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

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Anton Vorontsov 2009-03-17 00:13:52 +03:00 • committed by Pierre Ossman

parent 6aa943ab89

commit 68d1fb7e22

2 changed files with 17 additions and 2 deletions

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17

drivers/mmc/host/sdhci.c

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2

drivers/mmc/host/sdhci.h

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