[PATCH] omap_hsmmc: Flush posted write to IRQ

[Adrian Hunter]

From: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>

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 <khilman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---




This patch is slightly modified from Kevin's original, which is
here:

	http://marc.info/?l=linux-omap&m=123862814815052&w=2



drivers/mmc/host/omap_hsmmc.c |    4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 04e5a0c..2ae6049 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -452,6 +452,8 @@ 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;
	}

@@ -523,6 +525,8 @@ 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);
--
1.5.6.3
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