From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Keshava Munegowda <keshava_mgowda@ti.com>
Subject: Re: [PATCH 4/4] mfd: global Suspend and resume support of ehci and ohci
Date: Wed, 1 Jun 2011 15:54:38 +0200
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Cc: linux-usb@vger.kernel.org, linux-omap@vger.kernel.org,
        linux-kernel@vger.kernel.org, balbi@ti.com, gadiyar@ti.com,
        sameo@linux.intel.com, parthab@india.ti.com, tony@atomide.com,
        khilman@ti.com, b-cousson@ti.com, paul@pwsan.com
References: <1306934847-6098-1-git-send-email-keshava_mgowda@ti.com> <1306934847-6098-4-git-send-email-keshava_mgowda@ti.com> <1306934847-6098-5-git-send-email-keshava_mgowda@ti.com>
In-Reply-To: <1306934847-6098-5-git-send-email-keshava_mgowda@ti.com>
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On Wednesday, June 01, 2011, Keshava Munegowda wrote:
> From: Keshava Munegowda <Keshava_mgowda@ti.com>
> 
> The global suspend and resume functions for usbhs core driver
> are implemented.These routine are called when the global suspend
> and resume occurs. Before calling these functions, the
> bus suspend and resume of ehci and ohci drivers are called
> from runtime pm.
> 
> Signed-off-by: Keshava Munegowda <keshava_mgowda@ti.com>
> ---
>  drivers/mfd/omap-usb-host.c |  103 +++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 103 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
> index 43de12a..32d19e2 100644
> --- a/drivers/mfd/omap-usb-host.c
> +++ b/drivers/mfd/omap-usb-host.c
> @@ -146,6 +146,10 @@
>  #define is_ehci_hsic_mode(x)	(x == OMAP_EHCI_PORT_MODE_HSIC)
>  
>  
> +/* USBHS state bits */
> +#define OMAP_USBHS_INIT		0
> +#define OMAP_USBHS_SUSPEND	4
> +
>  struct usbhs_hcd_omap {
>  	struct clk			*xclk60mhsp1_ck;
>  	struct clk			*xclk60mhsp2_ck;
> @@ -165,6 +169,7 @@ struct usbhs_hcd_omap {
>  	u32				usbhs_rev;
>  	spinlock_t			lock;
>  	int				count;
> +	unsigned long			state;
>  };
>  /*-------------------------------------------------------------------------*/
>  
> @@ -809,6 +814,8 @@ static int usbhs_enable(struct device *dev)
>  				(pdata->ehci_data->reset_gpio_port[1], 1);
>  	}
>  
> +	set_bit(OMAP_USBHS_INIT, &omap->state);
> +
>  end_count:
>  	omap->count++;
>  	spin_unlock_irqrestore(&omap->lock, flags);
> @@ -897,6 +904,7 @@ static void usbhs_disable(struct device *dev)
>  	}
>  
>  	pm_runtime_put_sync(dev);
> +	clear_bit(OMAP_USBHS_INIT, &omap->state);
>  
>  	/* The gpio_free migh sleep; so unlock the spinlock */
>  	spin_unlock_irqrestore(&omap->lock, flags);
> @@ -926,10 +934,105 @@ void omap_usbhs_disable(struct device *dev)
>  }
>  EXPORT_SYMBOL_GPL(omap_usbhs_disable);
>  
> +#ifdef	CONFIG_PM
> +
> +static int usbhs_resume(struct device *dev)
> +{
> +	struct usbhs_hcd_omap		*omap = dev_get_drvdata(dev);
> +	struct usbhs_omap_platform_data	*pdata = &omap->platdata;
> +	unsigned long			flags = 0;
> +
> +	dev_dbg(dev, "Resuming TI HSUSB Controller\n");
> +
> +	if (!pdata) {
> +		dev_dbg(dev, "missing platform_data\n");
> +		return  -ENODEV;
> +	}
> +
> +	spin_lock_irqsave(&omap->lock, flags);
> +
> +	if (!test_bit(OMAP_USBHS_INIT, &omap->state) ||
> +		!test_bit(OMAP_USBHS_SUSPEND, &omap->state))
> +			goto end_resume;
> +
> +	pm_runtime_get_sync(dev);
> +
> +	if (is_omap_usbhs_rev2(omap)) {
> +		if (is_ehci_tll_mode(pdata->port_mode[0])) {
> +			clk_enable(omap->usbhost_p1_fck);
> +			clk_enable(omap->usbtll_p1_fck);
> +		}
> +		if (is_ehci_tll_mode(pdata->port_mode[1])) {
> +			clk_enable(omap->usbhost_p2_fck);
> +			clk_enable(omap->usbtll_p2_fck);
> +		}
> +		clk_enable(omap->utmi_p1_fck);
> +		clk_enable(omap->utmi_p2_fck);
> +	}
> +	clear_bit(OMAP_USBHS_SUSPEND, &omap->state);
> +
> +end_resume:
> +	spin_unlock_irqrestore(&omap->lock, flags);
> +	return 0;
> +}
> +
> +
> +static int usbhs_suspend(struct device *dev)
> +{
> +	struct usbhs_hcd_omap		*omap = dev_get_drvdata(dev);
> +	struct usbhs_omap_platform_data	*pdata = &omap->platdata;
> +	unsigned long			flags = 0;
> +
> +	dev_dbg(dev, "Suspending TI HSUSB Controller\n");
> +
> +	if (!pdata) {
> +		dev_dbg(dev, "missing platform_data\n");
> +		return  -ENODEV;
> +	}
> +
> +	spin_lock_irqsave(&omap->lock, flags);
> +
> +	if (!test_bit(OMAP_USBHS_INIT, &omap->state) ||
> +		test_bit(OMAP_USBHS_SUSPEND, &omap->state))
> +			goto end_suspend;
> +
> +	if (is_omap_usbhs_rev2(omap)) {
> +		if (is_ehci_tll_mode(pdata->port_mode[0])) {
> +			clk_disable(omap->usbhost_p1_fck);
> +			clk_disable(omap->usbtll_p1_fck);
> +		}
> +		if (is_ehci_tll_mode(pdata->port_mode[1])) {
> +			clk_disable(omap->usbhost_p2_fck);
> +			clk_disable(omap->usbtll_p2_fck);
> +		}
> +		clk_disable(omap->utmi_p2_fck);
> +		clk_disable(omap->utmi_p1_fck);
> +	}
> +
> +	set_bit(OMAP_USBHS_SUSPEND, &omap->state);
> +	pm_runtime_put_sync(dev);
> +
> +end_suspend:
> +	spin_unlock_irqrestore(&omap->lock, flags);
> +	return 0;
> +}
> +
> +
> +static const struct dev_pm_ops usbhsomap_dev_pm_ops = {
> +	.suspend	= usbhs_suspend,
> +	.resume		= usbhs_resume,
> +};

Please add .freeze()/.thaw() and .poweroff()/.restore() callbacks too.
They may point to the same routines, but must be present.

You can actually use the SIMPLE_DEV_PM_OPS() convenience macro for this
purpose.

> +
> +#define USBHS_OMAP_DEV_PM_OPS (&usbhsomap_dev_pm_ops)
> +#else
> +#define	USBHS_OMAP_DEV_PM_OPS	NULL
> +#endif
> +
>  static struct platform_driver usbhs_omap_driver = {
>  	.driver = {
>  		.name		= (char *)usbhs_driver_name,
>  		.owner		= THIS_MODULE,
> +		.pm		= USBHS_OMAP_DEV_PM_OPS,
>  	},
>  	.remove		= __exit_p(usbhs_omap_remove),
>  };
> 

Thanks,
Rafael
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