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mmc: sdhci: Avoid needless loop while handling SDIO interrupts in sdhci_irq

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Ignore Card Interrupt bit in the interrupt status if we already
know that mmc_signal_sdio_irq() is going to be called at the end of
sdhci_irq(). This avoids a needless loop in sdhci_irq() repeatedly
reading interrupt status and doing nothing.

Signed-off-by: Alexey Neyman <stilor@att.net>
Acked-by: Dong Aisheng <b29396@freescale.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Alexey Neyman 2013-11-05 19:40:36 -08:00 committed by Chris Ball
parent 4d22378221
commit 0a8fd09ca9
1 changed files with 8 additions and 0 deletions
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8
drivers/mmc/host/sdhci.c
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@ -2501,6 +2501,14 @@ again:
result = IRQ_HANDLED;
intmask = sdhci_readl(host, SDHCI_INT_STATUS);
/*
* If we know we'll call the driver to signal SDIO IRQ, disregard
* further indications of Card Interrupt in the status to avoid a
* needless loop.
*/
if (cardint)
intmask &= ~SDHCI_INT_CARD_INT;
if (intmask && --max_loops)
goto again;
out: