Re: [PATCH v3 3/4] mmc: omap_hsmmc: Remux pins to support SDIO interrupt on AM335x

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Thanks Andreas for the patch,

On Saturday 05 October 2013 04:47 PM, Andreas Fenkart wrote:
The am335x can't detect pending cirq in PM runtime suspend.
This patch reconfigures dat1 as a GPIO before going to suspend.
SDIO interrupts are detected with the GPIO, while in runtime
suspend, standard detection of the module block otherwise.

Signed-off-by: Andreas Fenkart <afenkart@xxxxxxxxx>

@@ -2293,23 +2440,66 @@ static int omap_hsmmc_resume(struct device *dev)
  static int omap_hsmmc_runtime_suspend(struct device *dev)
  {
  	struct omap_hsmmc_host *host;
+	unsigned long flags;
+	int ret = 0;

  	host = platform_get_drvdata(to_platform_device(dev));
  	omap_hsmmc_context_save(host);
  	dev_dbg(dev, "disabled\n");

-	return 0;
+	if (host->flags & HSMMC_SWAKEUP_QUIRK) {
+		spin_lock_irqsave(&host->irq_lock, flags);
+		OMAP_HSMMC_WRITE(host->base, ISE, 0);
+		OMAP_HSMMC_WRITE(host->base, IE, 0);
+		OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+		spin_unlock_irqrestore(&host->irq_lock, flags);
+
+		ret = pinctrl_select_state(host->pinctrl, host->idle);
+		if (ret < 0)
+			dev_warn(mmc_dev(host->mmc), "Unable to select idle pinmux\n");
+
+		enable_irq(mmc_slot(host).sdio_irq);
+	}
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	/* infinite loop, if irq not cleared in omap_hsmmc_enable_sdio_irq */
+	host->flags |= HSMMC_RUNTIME_SUSPENDED;
Can you provide more details about the infinite loop and how it will get recovered.

+	spin_unlock_irqrestore(&host->irq_lock, flags);
+
+	return ret;
  }

  static int omap_hsmmc_runtime_resume(struct device *dev)
  {
  	struct omap_hsmmc_host *host;
+	unsigned long flags;
+	int ret = 0;

  	host = platform_get_drvdata(to_platform_device(dev));
  	omap_hsmmc_context_restore(host);
  	dev_dbg(dev, "enabled\n");

-	return 0;
+	spin_lock_irqsave(&host->irq_lock, flags);
+	/* infinite loop, if irq not cleared in omap_hsmmc_enable_sdio_irq */
+	host->flags &= ~HSMMC_RUNTIME_SUSPENDED;
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+
+	if (host->flags & HSMMC_SWAKEUP_QUIRK) {
+		disable_irq(mmc_slot(host).sdio_irq);
+
+		ret = pinctrl_select_state(host->pinctrl, host->active);
+		if (ret < 0)
+			dev_warn(mmc_dev(host->mmc), "Unable to select active pinmux\n");
+
+		spin_lock_irqsave(&host->irq_lock, flags);
+		if (host->flags & HSMMC_SDIO_IRQ_ENABLED) {
+			OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+			OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
+			OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
+		}
+		spin_unlock_irqrestore(&host->irq_lock, flags);
+	}
+	return ret;
  }

  static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
diff --git a/include/linux/platform_data/mmc-omap.h b/include/linux/platform_data/mmc-omap.h
index 2bf1b30..fd5fff5 100644
--- a/include/linux/platform_data/mmc-omap.h
+++ b/include/linux/platform_data/mmc-omap.h
@@ -115,6 +115,7 @@ struct omap_mmc_platform_data {

  		int switch_pin;			/* gpio (card detect) */
  		int gpio_wp;			/* gpio (write protect) */
+		int gpio_cirq;			/* gpio (card irq) */

  		int (*set_bus_mode)(struct device *dev, int slot, int bus_mode);
  		int (*set_power)(struct device *dev, int slot,
@@ -145,6 +146,9 @@ struct omap_mmc_platform_data {
  		int card_detect_irq;
  		int (*card_detect)(struct device *dev, int slot);

+		/* SDIO IRQs */
+		int sdio_irq;
+
  		unsigned int ban_openended:1;

  	} slots[OMAP_MMC_MAX_SLOTS];

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