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omap_hsmmc: Flush posted write to IRQ

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Spurious IRQs seen on MMC after 2.6.29.  Flush posted write in IRQ
handler.

The interrupt line is released by clearing the error status bits
in the MMCHS_STAT register, which must occur before the interrupt
handler returns to avoid unwanted irqs.  Hence the need to flush
the posted write.

Signed-off-by: Kevin Hilman <[email protected]>
Signed-off-by: Adrian Hunter <[email protected]>
Acked-by: Tony Lindgen <[email protected]>
Signed-off-by: Pierre Ossman <[email protected]>
This commit is contained in:
Kevin Hilman 2009-04-06 15:01:19 +03:00 • committed by Pierre Ossman
commit 00adadc121
1 changed files with 4 additions and 0 deletions
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4
drivers/mmc/host/omap_hsmmc.c
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@ -434,6 +434,8 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
if (host->mrq == NULL) {
OMAP_HSMMC_WRITE(host->base, STAT,
OMAP_HSMMC_READ(host->base, STAT));
/* Flush posted write */
OMAP_HSMMC_READ(host->base, STAT);
return IRQ_HANDLED;
}
@ -489,6 +491,8 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
}
OMAP_HSMMC_WRITE(host->base, STAT, status);
/* Flush posted write */
OMAP_HSMMC_READ(host->base, STAT);
if (end_cmd || (status & CC))
mmc_omap_cmd_done(host, host->cmd);