[PATCH v8 0/3] mmc: omap_hsmmc: Enable SDIO IRQ.

[PATCH v8 0/3] mmc: omap_hsmmc: Enable SDIO IRQ.

[Andreas Fenkart]

Hi Tony,

I had an infinite loop in hsmmc_disable_wake_irq. Since the SDIO
irq is level triggered, I have to disable the IRQ in the handler
otherwise it is called infinitely. 

Did some other minor changes see below.

v8
- rebased on top of Tony Lindgren<tony@atomide.com> changes
  - improved changelog describing the earlier work
  - improved wakeup irq setup
  - works on am3730 es platform now
- my changes on top:
  - compile tested with #undef CONFIG_OF
  - disable wake_irq in handler to prevent infinite loop  
  - fixed typo and added comment about wake-irq

v7
- rebase on 3.14.0-rc3-49726-g77e15ec
- split omap_hsmmc_pin_init due to regression on omap-3730 platform

v6
- rebase on Linux 3.13-rc3
- reformatting debugfs

v5
- fix compile error introduced by last minute one line fix

v4:
- switch to interrupts-extended format
- drop ti,swakeup-missing flag convert to comaptible section

v3:
- removed gpio_irq from platform_data

v2:
- incorparated changes as suggested by reviewers
- simplified workaround for am335x, gpio will now only wake
  the module from runtime suspend, not handle the sdio irq
  itself 

Andreas Fenkart (3):
  mmc: omap_hsmmc: Enable SDIO interrupt
  mmc: omap_hsmmc: Pin remux workaround to support SDIO interrupt on
    AM335x
  mmc: omap_hsmmc: Extend debugfs for SDIO IRQ, GPIO and pinmux.

 .../devicetree/bindings/mmc/ti-omap-hsmmc.txt      |   50 +++
 drivers/mmc/host/omap_hsmmc.c                      |  337 ++++++++++++++++++--
 include/linux/platform_data/mmc-omap.h             |    1 +
 3 files changed, 363 insertions(+), 25 deletions(-)

-- 
1.7.10.4

[PATCH v8 1/3] mmc: omap_hsmmc: Enable SDIO interrupt

[Andreas Fenkart]

There have been various patches floating around for enabling
the SDIO IRQ for hsmmc, but none of them ever got merged.

Probably the reason for not merging the SDIO interrupt patches
has been the lack of wake-up path for SDIO on some omaps that
has also needed remuxing the SDIO DAT1 line to a GPIO making
the patches complex.

This patch adds the minimal SDIO IRQ support to hsmmc for
omaps that do have the wake-up path. For those omaps, the
DAT1 line need to have the wake-up enable bit set, and the
wake-up interrupt is the same as for the MMC controller.

This patch has been tested on am3730 es1.2 with mwifiex
connected to MMC3 with mwifiex waking to Ethernet traffic
from off-idle mode. Note that for omaps that do not have
the SDIO wake-up path, this patch will not work for idle
modes and further patches for remuxing DAT1 to GPIO are
needed.

Based on earlier patches [1][2] by David Vrabel
<david.vrabel@csr.com>, Steve Sakoman <steve@sakoman.com>
and Andreas Fenkart <afenkart@gmail.com> with the SDIO IRQ
handing improved following how sdhci.c is doing it.

For now, only support SDIO interrupt if we are booted with
a separate wake-irq configued via device tree. This is
because omaps need the wake-irq for idle states, and some
omaps need special quirks. And we don't want to add new
legacy mux platform init code callbacks any longer as we
are moving to DT based booting anyways.

To use it, you need to specify the wake-irq using the
interrupts-extended property.

[1] http://www.sakoman.com/cgi-bin/gitweb.cgi?p=linux.git;a=commitdiff_plain;h=010810d22f6f49ac03da4ba384969432e0320453
[2] http://comments.gmane.org/gmane.linux.kernel.mmc/20446

Cc: Balaji T K <balajitk@ti.com>
Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index f8b9c3b..47206c0 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -29,6 +29,7 @@
 #include <linux/timer.h>
 #include <linux/clk.h>
 #include <linux/of.h>
+#include <linux/of_irq.h>
 #include <linux/of_gpio.h>
 #include <linux/of_device.h>
 #include <linux/omap-dma.h>
@@ -36,6 +37,7 @@
 #include <linux/mmc/core.h>
 #include <linux/mmc/mmc.h>
 #include <linux/io.h>
+#include <linux/irq.h>
 #include <linux/gpio.h>
 #include <linux/regulator/consumer.h>
 #include <linux/pinctrl/consumer.h>
@@ -131,6 +133,7 @@ static void apply_clk_hack(struct device *dev)
 #define TC_EN			(1 << 1)
 #define BWR_EN			(1 << 4)
 #define BRR_EN			(1 << 5)
+#define CIRQ_EN			(1 << 8)
 #define ERR_EN			(1 << 15)
 #define CTO_EN			(1 << 16)
 #define CCRC_EN			(1 << 17)
@@ -205,6 +208,8 @@ struct omap_hsmmc_host {
 	u32			sysctl;
 	u32			capa;
 	int			irq;
+	int			wake_irq;
+	int			wake_irq_en;
 	int			use_dma, dma_ch;
 	struct dma_chan		*tx_chan;
 	struct dma_chan		*rx_chan;
@@ -215,6 +220,9 @@ struct omap_hsmmc_host {
 	int			reqs_blocked;
 	int			use_reg;
 	int			req_in_progress;
+	int                     flags;
+#define HSMMC_SDIO_IRQ_ENABLED	(1 << 0)        /* SDIO irq enabled */
+#define HSMMC_SWAKEUP_QUIRK	(1 << 1)
 	struct omap_hsmmc_next	next_data;
 	struct	omap_mmc_platform_data	*pdata;
 };
@@ -495,27 +503,40 @@ static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
 static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
 				  struct mmc_command *cmd)
 {
-	unsigned int irq_mask;
+	u32 irq_mask = INT_EN_MASK;
+	unsigned long flags;
 
 	if (host->use_dma)
-		irq_mask = INT_EN_MASK & ~(BRR_EN | BWR_EN);
-	else
-		irq_mask = INT_EN_MASK;
+		irq_mask &= ~(BRR_EN | BWR_EN);
 
 	/* Disable timeout for erases */
 	if (cmd->opcode == MMC_ERASE)
 		irq_mask &= ~DTO_EN;
 
+	spin_lock_irqsave(&host->irq_lock, flags);
 	OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 	OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
+
+	/* latch pending CIRQ, but don't signal MMC core */
+	if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
+		irq_mask |= CIRQ_EN;
 	OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
+	spin_unlock_irqrestore(&host->irq_lock, flags);
 }
 
 static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
 {
-	OMAP_HSMMC_WRITE(host->base, ISE, 0);
-	OMAP_HSMMC_WRITE(host->base, IE, 0);
+	u32 irq_mask = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	/* no transfer running but need to keep cirq if enabled */
+	if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
+		irq_mask |= CIRQ_EN;
+	OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
+	OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
 	OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+	spin_unlock_irqrestore(&host->irq_lock, flags);
 }
 
 /* Calculate divisor for the given clock frequency */
@@ -1078,8 +1099,12 @@ static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
 	int status;
 
 	status = OMAP_HSMMC_READ(host->base, STAT);
-	while (status & INT_EN_MASK && host->req_in_progress) {
-		omap_hsmmc_do_irq(host, status);
+	while (status & (INT_EN_MASK | CIRQ_EN)) {
+		if (host->req_in_progress)
+			omap_hsmmc_do_irq(host, status);
+
+		if (status & CIRQ_EN)
+			mmc_signal_sdio_irq(host->mmc);
 
 		/* Flush posted write */
 		status = OMAP_HSMMC_READ(host->base, STAT);
@@ -1088,6 +1113,45 @@ static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static inline void hsmmc_enable_wake_irq(struct omap_hsmmc_host *host)
+{
+	unsigned long flags;
+
+	if (!host->wake_irq)
+		return;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	enable_irq(host->wake_irq);
+	host->wake_irq_en = true;
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+}
+
+static inline void hsmmc_disable_wake_irq(struct omap_hsmmc_host *host)
+{
+	unsigned long flags;
+
+	if (!host->wake_irq)
+		return;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+	if (host->wake_irq_en)
+		disable_irq_nosync(host->wake_irq);
+	host->wake_irq_en = false;
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+}
+
+static irqreturn_t omap_hsmmc_wake_irq(int irq, void *dev_id)
+{
+	struct omap_hsmmc_host *host = dev_id;
+
+	/* cirq is level triggered, disable to avoid infinite loop */
+	hsmmc_disable_wake_irq(host);
+
+	pm_request_resume(host->dev); /* no use counter */
+
+	return IRQ_HANDLED;
+}
+
 static void set_sd_bus_power(struct omap_hsmmc_host *host)
 {
 	unsigned long i;
@@ -1591,6 +1655,70 @@ static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
 		mmc_slot(host).init_card(card);
 }
 
+static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
+{
+	struct omap_hsmmc_host *host = mmc_priv(mmc);
+	u32 irq_mask;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->irq_lock, flags);
+
+	irq_mask = OMAP_HSMMC_READ(host->base, ISE);
+	if (enable) {
+		host->flags |= HSMMC_SDIO_IRQ_ENABLED;
+		irq_mask |= CIRQ_EN;
+	} else {
+		host->flags &= ~HSMMC_SDIO_IRQ_ENABLED;
+		irq_mask &= ~CIRQ_EN;
+	}
+	OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
+
+	/*
+	 * if enable, piggy back detection on current request
+	 * but always disable immediately
+	 */
+	if (!host->req_in_progress || !enable)
+		OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
+
+	/* flush posted write */
+	OMAP_HSMMC_READ(host->base, IE);
+
+	spin_unlock_irqrestore(&host->irq_lock, flags);
+}
+
+static int omap_hscmm_configure_wake_irq(struct omap_hsmmc_host *host)
+{
+	struct mmc_host *mmc = host->mmc;
+	int ret;
+
+	/*
+	 * The wake-irq is needed for omaps with wake-up path and also
+	 * when doing GPIO remuxing.
+	 */
+	if (!host->dev->of_node || !host->wake_irq)
+		return -ENODEV;
+
+	/* Prevent auto-enabling of IRQ */
+	irq_set_status_flags(host->wake_irq, IRQ_NOAUTOEN);
+	ret = request_irq(host->wake_irq, omap_hsmmc_wake_irq,
+			  IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+			  mmc_hostname(mmc), host);
+	if (ret) {
+		dev_err(mmc_dev(host->mmc),
+			"Unable to request wake IRQ\n");
+		return ret;
+	}
+
+	/*
+	 * Some omaps don't have wake-up path from deeper idle states
+	 * and need to remux SDIO DAT1 to GPIO for wake-up from idle.
+	 */
+	if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING)
+		host->flags |= HSMMC_SWAKEUP_QUIRK;
+
+	return 0;
+}
+
 static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
 {
 	u32 hctl, capa, value;
@@ -1643,7 +1771,7 @@ static const struct mmc_host_ops omap_hsmmc_ops = {
 	.get_cd = omap_hsmmc_get_cd,
 	.get_ro = omap_hsmmc_get_ro,
 	.init_card = omap_hsmmc_init_card,
-	/* NYET -- enable_sdio_irq */
+	.enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
 };
 
 #ifdef CONFIG_DEBUG_FS
@@ -1704,8 +1832,19 @@ static void omap_hsmmc_debugfs(struct mmc_host *mmc)
 
 #endif
 
+struct of_data {
+	u16 offset;
+	int flags;
+};
+
 #ifdef CONFIG_OF
-static u16 omap4_reg_offset = 0x100;
+static struct of_data omap4_data = {
+	.offset	= 0x100,
+};
+static struct of_data am33xx_data = {
+	.offset	= 0x100,
+	.flags	= OMAP_HSMMC_SWAKEUP_MISSING,
+};
 
 static const struct of_device_id omap_mmc_of_match[] = {
 	{
@@ -1716,7 +1855,11 @@ static const struct of_device_id omap_mmc_of_match[] = {
 	},
 	{
 		.compatible = "ti,omap4-hsmmc",
-		.data = &omap4_reg_offset,
+		.data = &omap4_data,
+	},
+	{
+		.compatible = "ti,am33xx-hsmmc",
+		.data = &am33xx_data,
 	},
 	{},
 };
@@ -1779,6 +1922,7 @@ static inline struct omap_mmc_platform_data
 {
 	return NULL;
 }
+#define omap_mmc_of_match	NULL
 #endif
 
 static int omap_hsmmc_probe(struct platform_device *pdev)
@@ -1787,7 +1931,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	struct mmc_host *mmc;
 	struct omap_hsmmc_host *host = NULL;
 	struct resource *res;
-	int ret, irq;
+	int ret, irq, _wake_irq = 0;
 	const struct of_device_id *match;
 	dma_cap_mask_t mask;
 	unsigned tx_req, rx_req;
@@ -1801,8 +1945,9 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 			return PTR_ERR(pdata);
 
 		if (match->data) {
-			const u16 *offsetp = match->data;
-			pdata->reg_offset = *offsetp;
+			const struct of_data *d = match->data;
+			pdata->reg_offset = d->offset;
+			pdata->controller_flags |= d->flags;
 		}
 	}
 
@@ -1821,6 +1966,9 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	if (res == NULL || irq < 0)
 		return -ENXIO;
 
+	if (pdev->dev.of_node)
+		_wake_irq = irq_of_parse_and_map(pdev->dev.of_node, 1);
+
 	res = request_mem_region(res->start, resource_size(res), pdev->name);
 	if (res == NULL)
 		return -EBUSY;
@@ -1842,6 +1990,7 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	host->use_dma	= 1;
 	host->dma_ch	= -1;
 	host->irq	= irq;
+	host->wake_irq = _wake_irq;
 	host->slot_id	= 0;
 	host->mapbase	= res->start + pdata->reg_offset;
 	host->base	= ioremap(host->mapbase, SZ_4K);
@@ -2018,6 +2167,18 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 		dev_warn(&pdev->dev,
 			"pins are not configured from the driver\n");
 
+	/*
+	 * For now, only support SDIO interrupt if we have a separate
+	 * wake-up interrupt configured from device tree. This is because
+	 * the wake-up interrupt is needed for idle state and some
+	 * platforms need special quirks. And we don't want to add new
+	 * legacy mux platform init code callbacks any longer as we
+	 * are moving to DT based booting anyways.
+	 */
+	ret = omap_hscmm_configure_wake_irq(host);
+	if (!ret)
+		mmc->caps |= MMC_CAP_SDIO_IRQ;
+
 	omap_hsmmc_protect_card(host);
 
 	mmc_add_host(mmc);
@@ -2042,7 +2203,10 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
 err_slot_name:
 	mmc_remove_host(mmc);
-	free_irq(mmc_slot(host).card_detect_irq, host);
+	if (host->wake_irq)
+		free_irq(host->wake_irq, host);
+	if (mmc_slot(host).card_detect_irq)
+		free_irq(mmc_slot(host).card_detect_irq, host);
 err_irq_cd:
 	if (host->use_reg)
 		omap_hsmmc_reg_put(host);
@@ -2087,6 +2251,8 @@ static int omap_hsmmc_remove(struct platform_device *pdev)
 	if (host->pdata->cleanup)
 		host->pdata->cleanup(&pdev->dev);
 	free_irq(host->irq, host);
+	if (host->wake_irq)
+		free_irq(host->wake_irq, host);
 	if (mmc_slot(host).card_detect_irq)
 		free_irq(mmc_slot(host).card_detect_irq, host);
 
@@ -2149,6 +2315,8 @@ static int omap_hsmmc_suspend(struct device *dev)
 				OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
 	}
 
+	hsmmc_disable_wake_irq(host);
+
 	if (host->dbclk)
 		clk_disable_unprepare(host->dbclk);
 
@@ -2174,6 +2342,8 @@ static int omap_hsmmc_resume(struct device *dev)
 
 	omap_hsmmc_protect_card(host);
 
+	hsmmc_enable_wake_irq(host);
+
 	pm_runtime_mark_last_busy(host->dev);
 	pm_runtime_put_autosuspend(host->dev);
 	return 0;
@@ -2189,23 +2359,38 @@ static int omap_hsmmc_resume(struct device *dev)
 static int omap_hsmmc_runtime_suspend(struct device *dev)
 {
 	struct omap_hsmmc_host *host;
+	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->mmc->caps & MMC_CAP_SDIO_IRQ) {
+		OMAP_HSMMC_WRITE(host->base, ISE, 0);
+		OMAP_HSMMC_WRITE(host->base, IE, 0);
+		OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+		hsmmc_enable_wake_irq(host);
+	}
+
+	return ret;
 }
 
 static int omap_hsmmc_runtime_resume(struct device *dev)
 {
 	struct omap_hsmmc_host *host;
+	int ret = 0;
 
 	host = platform_get_drvdata(to_platform_device(dev));
 	omap_hsmmc_context_restore(host);
 	dev_dbg(dev, "enabled\n");
 
-	return 0;
+	if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
+		hsmmc_disable_wake_irq(host);
+		OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+		OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
+		OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
+	}
+	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..51e70cf 100644
--- a/include/linux/platform_data/mmc-omap.h
+++ b/include/linux/platform_data/mmc-omap.h
@@ -28,6 +28,7 @@
  */
 #define OMAP_HSMMC_SUPPORTS_DUAL_VOLT		BIT(0)
 #define OMAP_HSMMC_BROKEN_MULTIBLOCK_READ	BIT(1)
+#define OMAP_HSMMC_SWAKEUP_MISSING		BIT(2)
 
 struct mmc_card;
 
-- 
1.7.10.4

[PATCH v8 2/3] mmc: omap_hsmmc: Pin remux workaround to support SDIO interrupt on AM335x

[Andreas Fenkart]

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, the GPIO will only wake
the module from suspend, SDIO irq detection will still happen through the
IP block.

Idea of remuxing the pins and some minor changes by Tony Lindgren.

Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
index 8c8908a..8e1195e 100644
--- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
+++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
@@ -55,3 +55,53 @@ Examples:
 			&edma 25>;
 		dma-names = "tx", "rx";
 	};
+
+[workaround for missing swakeup on am33xx]
+
+This SOC is missing the swakeup line, it will not detect SDIO irq
+while in suspend.
+
+                             ------
+                             | PRCM |
+                              ------
+                               ^ |
+                       swakeup | | fclk
+                               | v
+       ------                -------               -----
+      | card | -- CIRQ -->  | hsmmc | -- IRQ -->  | CPU |
+       ------                -------               -----
+
+In suspend the fclk is off and the module is disfunctional. Even
+register reads will fail. A small logic in the host will request
+fclk restore, when an external event is detected. Once the clock
+is restored, the host detects the event normally. Since am33xx
+doesn't have this line it never wakes from suspend.
+
+The workaround is to reconfigure the dat1 line as a GPIO upon
+suspend. To make this work, we need to set 1) the named pinctrl
+states "default", "active" and "idle", 2) the gpio detecting
+sdio irq in suspend and 3) compatibe section, see example below.
+The MMC driver will then toggle between active and idle during
+the runtime. If configuration is incomplete, a warning message is
+emitted "falling back to polling".  Mind not every application
+needs SDIO irq, e.g. MMC cards Affected chips are am335x,
+probably others
+
+
+	mmc1: mmc@48060100 {
+		compatible = "ti,am33xx-hsmmc";
+		...
+		interrupts-extended = <&intc 64 &gpio2 28 0>;
+		...
+		pinctrl-names = "default", "active", "idle"
+		pinctrl-0 = <&mmc1_pins>;
+		pinctrl-1 = <&mmc1_pins>;
+		pinctrl-2 = <&mmc1_cirq_pin>;
+		...
+	};
+
+	mmc1_cirq_pin: pinmux_cirq_pin {
+		pinctrl-single,pins = <
+		        0x0f8 0x3f      /* GPIO2_28 */
+		>;
+	};
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 47206c0..16985da 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -224,6 +224,8 @@ struct omap_hsmmc_host {
 #define HSMMC_SDIO_IRQ_ENABLED	(1 << 0)        /* SDIO irq enabled */
 #define HSMMC_SWAKEUP_QUIRK	(1 << 1)
 	struct omap_hsmmc_next	next_data;
+	struct pinctrl		*pinctrl;
+	struct pinctrl_state	*fixed, *active, *idle;
 	struct	omap_mmc_platform_data	*pdata;
 };
 
@@ -480,6 +482,70 @@ static void omap_hsmmc_gpio_free(struct omap_mmc_platform_data *pdata)
 		gpio_free(pdata->slots[0].switch_pin);
 }
 
+static int omap_hsmmc_pin_init(struct omap_hsmmc_host *host)
+{
+	struct pinctrl *_pinctrl;
+	int ret;
+
+	_pinctrl = devm_pinctrl_get(host->dev);
+	if (IS_ERR(_pinctrl)) {
+		/* okay, if the bootloader set it up right */
+		dev_warn(host->dev, "no pinctrl handle\n");
+		return 0;
+	}
+
+	host->fixed = pinctrl_lookup_state(_pinctrl,
+					   PINCTRL_STATE_DEFAULT);
+	if (IS_ERR(host->fixed)) {
+		dev_info(host->dev,
+			 "pins are not configured from the driver\n");
+		host->fixed = NULL;
+		devm_pinctrl_put(_pinctrl);
+		return 0;
+	}
+
+	ret = pinctrl_select_state(_pinctrl, host->fixed);
+	if (ret < 0) {
+		dev_warn(host->dev, "fixed pinctrl state failed %d\n", ret);
+		goto err;
+	}
+
+	/* For most cases we don't have wake-ups, and exit after this */
+	host->active = pinctrl_lookup_state(_pinctrl, "active");
+	if (IS_ERR(host->active)) {
+		ret = PTR_ERR(host->active);
+		host->active = NULL;
+		goto done;
+	}
+
+	host->idle = pinctrl_lookup_state(_pinctrl, PINCTRL_STATE_IDLE);
+	if (IS_ERR(host->idle)) {
+		ret = PTR_ERR(host->idle);
+		host->idle = NULL;
+		goto err;
+	}
+
+	/* Let's make sure the active and idle states work */
+	ret = pinctrl_select_state(_pinctrl, host->idle);
+	if (ret < 0)
+		goto err;
+
+	ret = pinctrl_select_state(_pinctrl, host->active);
+	if (ret < 0)
+		goto err;
+
+	dev_info(mmc_dev(host->mmc), "pins configured for wake-up events\n");
+
+done:
+	host->pinctrl = _pinctrl;
+	return 0;
+
+err:
+	dev_err(mmc_dev(host->mmc), "pins configuration error: %i\n", ret);
+	devm_pinctrl_put(_pinctrl);
+	return ret;
+}
+
 /*
  * Start clock to the card
  */
@@ -1713,8 +1779,14 @@ static int omap_hscmm_configure_wake_irq(struct omap_hsmmc_host *host)
 	 * Some omaps don't have wake-up path from deeper idle states
 	 * and need to remux SDIO DAT1 to GPIO for wake-up from idle.
 	 */
-	if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING)
+	if (host->pdata->controller_flags & OMAP_HSMMC_SWAKEUP_MISSING) {
+		if (!host->idle) {
+			free_irq(host->wake_irq, host);
+			host->wake_irq = 0;
+			return -EINVAL;
+		}
 		host->flags |= HSMMC_SWAKEUP_QUIRK;
+	}
 
 	return 0;
 }
@@ -1935,7 +2007,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	const struct of_device_id *match;
 	dma_cap_mask_t mask;
 	unsigned tx_req, rx_req;
-	struct pinctrl *pinctrl;
 
 	match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
 	if (match) {
@@ -2162,10 +2233,9 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 
 	omap_hsmmc_disable_irq(host);
 
-	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
-	if (IS_ERR(pinctrl))
-		dev_warn(&pdev->dev,
-			"pins are not configured from the driver\n");
+	ret = omap_hsmmc_pin_init(host);
+	if (ret)
+		goto err_pinctrl_state;
 
 	/*
 	 * For now, only support SDIO interrupt if we have a separate
@@ -2205,7 +2275,10 @@ err_slot_name:
 	mmc_remove_host(mmc);
 	if (host->wake_irq)
 		free_irq(host->wake_irq, host);
-	if (mmc_slot(host).card_detect_irq)
+	if (host->pinctrl)
+		devm_pinctrl_put(host->pinctrl);
+err_pinctrl_state:
+	if ((mmc_slot(host).card_detect_irq))
 		free_irq(mmc_slot(host).card_detect_irq, host);
 err_irq_cd:
 	if (host->use_reg)
@@ -2260,6 +2333,8 @@ static int omap_hsmmc_remove(struct platform_device *pdev)
 		dma_release_channel(host->tx_chan);
 	if (host->rx_chan)
 		dma_release_channel(host->rx_chan);
+	if (host->pinctrl)
+		devm_pinctrl_put(host->pinctrl);
 
 	pm_runtime_put_sync(host->dev);
 	pm_runtime_disable(host->dev);
@@ -2369,6 +2444,11 @@ static int omap_hsmmc_runtime_suspend(struct device *dev)
 		OMAP_HSMMC_WRITE(host->base, ISE, 0);
 		OMAP_HSMMC_WRITE(host->base, IE, 0);
 		OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
+		if (host->idle) {
+			ret = pinctrl_select_state(host->pinctrl, host->idle);
+			if (ret < 0)
+				dev_warn(mmc_dev(host->mmc), "Unable to select idle pinmux\n");
+		}
 		hsmmc_enable_wake_irq(host);
 	}
 
@@ -2386,6 +2466,11 @@ static int omap_hsmmc_runtime_resume(struct device *dev)
 
 	if (host->mmc->caps & MMC_CAP_SDIO_IRQ) {
 		hsmmc_disable_wake_irq(host);
+		if (host->active) {
+			ret = pinctrl_select_state(host->pinctrl, host->active);
+			if (ret < 0)
+				dev_warn(mmc_dev(host->mmc), "Unable to select active pinmux\n");
+		}
 		OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
 		OMAP_HSMMC_WRITE(host->base, ISE, CIRQ_EN);
 		OMAP_HSMMC_WRITE(host->base, IE, CIRQ_EN);
-- 
1.7.10.4

[PATCH v8 3/3] mmc: omap_hsmmc: Extend debugfs for SDIO IRQ, GPIO and pinmux.

[Andreas Fenkart]

Add SDIO IRQ entries to debugfs entry. Note that PSTATE shows current
state of data lines, incl. SDIO IRQ pending

Signed-off-by: Andreas Fenkart <afenkart@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 16985da..94b2e81 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -82,6 +82,7 @@ static void apply_clk_hack(struct device *dev)
 #define OMAP_HSMMC_RSP54	0x0118
 #define OMAP_HSMMC_RSP76	0x011C
 #define OMAP_HSMMC_DATA		0x0120
+#define OMAP_HSMMC_PSTATE	0x0124
 #define OMAP_HSMMC_HCTL		0x0128
 #define OMAP_HSMMC_SYSCTL	0x012C
 #define OMAP_HSMMC_STAT		0x0130
@@ -1852,14 +1853,30 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
 {
 	struct mmc_host *mmc = s->private;
 	struct omap_hsmmc_host *host = mmc_priv(mmc);
+	const char *cirq_state;
+	bool suspended;
 
-	seq_printf(s, "mmc%d:\n ctx_loss:\t%d\n\nregs:\n",
-			mmc->index, host->context_loss);
+	seq_printf(s, "mmc%d:\n", mmc->index);
+	if (mmc->caps & MMC_CAP_SDIO_IRQ)
+		cirq_state = (host->flags & HSMMC_SDIO_IRQ_ENABLED) ?
+			"enabled" : "disabled";
+	else
+		cirq_state = "polling";
+	seq_printf(s, "sdio irq\t%s\n", cirq_state);
 
-	pm_runtime_get_sync(host->dev);
+	if (host->flags & HSMMC_SWAKEUP_QUIRK) {
+		suspended = host->dev->power.runtime_status != RPM_ACTIVE;
+		seq_printf(s, "pinmux config\t%s\n", (suspended ?
+						      "gpio" : "sdio"));
+	}
+	seq_printf(s, "ctx_loss:\t%d\n", host->context_loss);
 
+	pm_runtime_get_sync(host->dev);
+	seq_puts(s, "\nregs:\n");
 	seq_printf(s, "CON:\t\t0x%08x\n",
 			OMAP_HSMMC_READ(host->base, CON));
+	seq_printf(s, "PSTATE:\t\t0x%08x\n",
+		   OMAP_HSMMC_READ(host->base, PSTATE));
 	seq_printf(s, "HCTL:\t\t0x%08x\n",
 			OMAP_HSMMC_READ(host->base, HCTL));
 	seq_printf(s, "SYSCTL:\t\t0x%08x\n",
-- 
1.7.10.4

Re: [PATCH v8 0/3] mmc: omap_hsmmc: Enable SDIO IRQ.

[Tony Lindgren]

* Andreas Fenkart <afenkart@gmail.com> [140305 00:39]:
> Hi Tony,
> 
> I had an infinite loop in hsmmc_disable_wake_irq. Since the SDIO
> irq is level triggered, I have to disable the IRQ in the handler
> otherwise it is called infinitely. 
> 
> Did some other minor changes see below.
> 
> v8
> - rebased on top of Tony Lindgren<tony@atomide.com> changes
>   - improved changelog describing the earlier work
>   - improved wakeup irq setup
>   - works on am3730 es platform now
> - my changes on top:
>   - compile tested with #undef CONFIG_OF
>   - disable wake_irq in handler to prevent infinite loop  
>   - fixed typo and added comment about wake-irq

Great, tested here and things work for me for waking omap3
from off-idle based on the SDIO interrupt.

Maybe leave out the trailing period from the Subject line
for the last patch? If you look at git log --pretty=oneline
the trailing period is rarely used :)

Balaji, care to queue or ack these for Chris? Looks like
Chris has a wrong email address (corrected in this mail),
so maybe one more repost of the series is needed.

Regards,

Tony