From: Magnus Damm on
2010/7/20 Yusuke Goda <>:
> This patch updates ack_mmc_irqs() to acknowledge using write instead
> of read-modify-write. Without this fix the old read-modify-write
> implementation may acknowledge interrupt sources by mistake. The
> driver may if so lock-up waiting forever for an interrupt that will
> never come. Observed with the TMIO_STAT_RXRDY bit together with CMD53
> on AR6002 and BCM4318 SDIO cards in polled mode.
> Signed-off-by: Yusuke Goda <>

Simple testing with a BCM4318 card and a MMC card on sh7372 and SDHI
shows no problems.

Acked-by: Magnus Damm <damm(a)>
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