When using MSI it is possible that a new MSI is sent while an earlier
MSI is currently handled. In this case SDHCI_INT_STATUS only contains
SDHCI_INT_RESPONSE and the ISR would not be called again. But at the end
of the ISR SDHCI_INT_DATA_END is now also pending which would be ignored.
Fix this by rereading the interrupt flags in the ISR until no interrupt
we care is pending.
Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 8d66706..654ab32 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2268,6 +2268,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
irqreturn_t result;
struct sdhci_host *host = dev_id;
u32 intmask;
+ u32 intmask_unhandled;
int cardint = 0;
spin_lock(&host->lock);
@@ -2286,6 +2287,7 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
goto out;
}
+again:
DBG("*** %s got interrupt: 0x%08x\n",
mmc_hostname(host->mmc), intmask);
@@ -2336,6 +2338,14 @@ static irqreturn_t sdhci_irq(int irq, void *dev_id)
sdhci_writel(host, SDHCI_INT_BUS_POWER, SDHCI_INT_STATUS);
}
+ intmask_unhandled = intmask;
+
+ intmask = sdhci_readl(host, SDHCI_INT_STATUS);
+
+ /* Do interrupt handling again if we got new flags */
+ if (intmask & ~intmask_unhandled)
+ goto again;
+
intmask &= ~SDHCI_INT_BUS_POWER;
if (intmask & SDHCI_INT_CARD_INT)
--
1.7.3.4
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