From: Ulf Hansson <ulf.hansson@linaro.org>
Date: Thu, 24 Oct 2013 13:58:45 +0000 (+0200)
Subject: mmc: tmio: Keep host active while SDIO IRQ is enabled
X-Git-Tag: upstream/snapshot3+hdmi~21^2~24
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b6f003f799c5e9dd08e3c3d5d9e8690aa7824220;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

mmc: tmio: Keep host active while SDIO IRQ is enabled

The host must be kept active to be able to serve SDIO IRQs, thus let's
prevent it from going inactive while SDIO IRQ is enabled.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
(cherry picked from commit 7501c4315faf46b088ed4de4d8695a91d7d63869)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---

diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index 100ffe0..d6ceb1a 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -101,6 +101,7 @@ struct tmio_mmc_host {
 	struct mutex		ios_lock;	/* protect set_ios() context */
 	bool			native_hotplug;
 	bool			resuming;
+	bool			sdio_irq_enabled;
 };
 
 int tmio_mmc_host_probe(struct tmio_mmc_host **host,
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index faf0924..5c2e5a3 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -129,15 +129,22 @@ static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
 {
 	struct tmio_mmc_host *host = mmc_priv(mmc);
 
-	if (enable) {
+	if (enable && !host->sdio_irq_enabled) {
+		/* Keep device active while SDIO irq is enabled */
+		pm_runtime_get_sync(mmc_dev(mmc));
+		host->sdio_irq_enabled = true;
+
 		host->sdio_irq_mask = TMIO_SDIO_MASK_ALL &
 					~TMIO_SDIO_STAT_IOIRQ;
 		sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
 		sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
-	} else {
+	} else if (!enable && host->sdio_irq_enabled) {
 		host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
 		sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
 		sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0000);
+
+		host->sdio_irq_enabled = false;
+		pm_runtime_put(mmc_dev(mmc));
 	}
 }
 
@@ -1074,8 +1081,12 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host,
 
 	_host->sdcard_irq_mask &= ~irq_mask;
 
-	if (pdata->flags & TMIO_MMC_SDIO_IRQ)
-		tmio_mmc_enable_sdio_irq(mmc, 0);
+	_host->sdio_irq_enabled = false;
+	if (pdata->flags & TMIO_MMC_SDIO_IRQ) {
+		_host->sdio_irq_mask = TMIO_SDIO_MASK_ALL;
+		sd_ctrl_write16(_host, CTL_SDIO_IRQ_MASK, _host->sdio_irq_mask);
+		sd_ctrl_write16(_host, CTL_TRANSACTION_CTL, 0x0000);
+	}
 
 	spin_lock_init(&_host->lock);
 	mutex_init(&_host->ios_lock);