mmc: sdhci: call sdhci_init() before request irq

sdhci_init() will clear all irqs and set the needed irqs. So
logically sdhci_init() should be called before request irq.

If not, some irqs may be triggled and handled wrongly. Take
the following into consideration, after request irq, if
SDIO card interrupt enabled, a sd card in the sd slot will
trigger a mass of interrupt(SDHCI_INT_CARD_INT), because at
this time, the vmmc-regulator still not restore, no voltage
supply for the sd card, so the pin of data0~data3 change and
keep low, interrupt(SDHCI_INT_CARD_INT) will rise up ceaselessly.
Due to we already reguest irq, system will be busy in handling
this endless irq, can't response to other event.

So we should call sdhci_init() before request irq in sd resume.

Signed-off-by: Haibo Chen <haibo.chen@freescale.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index fbc7efdddcb5a4cb9c2726b91e2ee29acfa85f08..2cadf0891f15b5db4a4b504d9c2225390562a480 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2716,17 +2716,6 @@ int sdhci_resume_host(struct sdhci_host *host)
                        host->ops->enable_dma(host);
        }
 
-       if (!device_may_wakeup(mmc_dev(host->mmc))) {
-               ret = request_threaded_irq(host->irq, sdhci_irq,
-                                          sdhci_thread_irq, IRQF_SHARED,
-                                          mmc_hostname(host->mmc), host);
-               if (ret)
-                       return ret;
-       } else {
-               sdhci_disable_irq_wakeups(host);
-               disable_irq_wake(host->irq);
-       }
-
        if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
            (host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
                /* Card keeps power but host controller does not */
@@ -2739,6 +2728,17 @@ int sdhci_resume_host(struct sdhci_host *host)
                mmiowb();
        }
 
+       if (!device_may_wakeup(mmc_dev(host->mmc))) {
+               ret = request_threaded_irq(host->irq, sdhci_irq,
+                                          sdhci_thread_irq, IRQF_SHARED,
+                                          mmc_hostname(host->mmc), host);
+               if (ret)
+                       return ret;
+       } else {
+               sdhci_disable_irq_wakeups(host);
+               disable_irq_wake(host->irq);
+       }
+
        sdhci_enable_card_detection(host);
 
        return ret;