linux-kernel - [PATCH 4/6] mfd: omap-usb-host: Put pins in IDLE state on suspend

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Date:	Wed, 10 Jul 2013 19:23:00 +0300
From:	Roger Quadros <rogerq@...com>
To:	<stern@...land.harvard.edu>
CC:	<gregkh@...uxfoundation.org>, <balbi@...com>,
	<sergei.shtylyov@...entembedded.com>, <khilman@...aro.org>,
	<tony@...mide.com>, <ruslan.bilovol@...com>,
	<linux-usb@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Roger Quadros <rogerq@...com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: [PATCH 4/6] mfd: omap-usb-host: Put pins in IDLE state on suspend

In order to support wake up from suspend use the pinctrl
framework to put the USB host pins in IDLE state during suspend.

CC: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/mfd/omap-usb-host.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
index fb2b3d8..3734d16 100644
--- a/drivers/mfd/omap-usb-host.c
+++ b/drivers/mfd/omap-usb-host.c
@@ -31,6 +31,7 @@
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/err.h>
+#include <linux/pinctrl/consumer.h>
 
 #include "omap-usb.h"
 
@@ -111,6 +112,7 @@ struct usbhs_hcd_omap {
 	struct usbhs_omap_platform_data	*pdata;
 
 	u32				usbhs_rev;
+	bool				no_idle;
 };
 /*-------------------------------------------------------------------------*/
 
@@ -325,6 +327,7 @@ static int usbhs_runtime_resume(struct device *dev)
 
 	dev_dbg(dev, "usbhs_runtime_resume\n");
 
+	pinctrl_pm_select_default_state(dev);
 	omap_tll_enable(pdata);
 
 	if (!IS_ERR(omap->ehci_logic_fck))
@@ -378,6 +381,12 @@ static int usbhs_runtime_suspend(struct device *dev)
 
 	dev_dbg(dev, "usbhs_runtime_suspend\n");
 
+	if (omap->no_idle) {
+		dev_dbg(dev, "%s: Not suspending as IDLE pins not available\n",
+					__func__);
+		return -EBUSY;
+	}
+
 	for (i = 0; i < omap->nports; i++) {
 		switch (pdata->port_mode[i]) {
 		case OMAP_EHCI_PORT_MODE_HSIC:
@@ -401,6 +410,7 @@ static int usbhs_runtime_suspend(struct device *dev)
 		clk_disable(omap->ehci_logic_fck);
 
 	omap_tll_disable(pdata);
+	pinctrl_pm_select_idle_state(dev);
 
 	return 0;
 }
@@ -608,6 +618,14 @@ static int usbhs_omap_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
+	if (!dev->pins || !dev->pins->idle_state) {
+		/* If IDLE pins are not available, we can't remote wakeup,
+		 * so prevent idling in that case.
+		 */
+		omap->no_idle = true;
+		dev_info(dev, "No IDLE pins so runtime idle disabled\n");
+	}
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	omap->uhh_base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(omap->uhh_base))
@@ -796,6 +814,8 @@ static int usbhs_omap_probe(struct platform_device *pdev)
 		}
 	}
 
+	pinctrl_pm_select_default_state(dev);
+
 	return 0;
 
 err_alloc:
@@ -872,6 +892,8 @@ static int usbhs_omap_remove(struct platform_device *pdev)
 
 	/* remove children */
 	device_for_each_child(&pdev->dev, NULL, usbhs_omap_remove_child);
+	pinctrl_pm_select_idle_state(&pdev->dev);
+
 	return 0;
 }
 
-- 
1.7.4.1

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