tree 09e60a2e1e5b3569dd309348a8c164c859c89671
parent 6aa943ab8994fe6e4ccba22c5bc8150a84268bdd
author Anton Vorontsov <avorontsov@ru.mvista.com> 1237238032 +0300
committer Pierre Ossman <drzeus@drzeus.cx> 1237926608 +0100

sdhci: Add support for card-detection polling

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>