On Mon, 22 May 2017, Tony Lindgren wrote:
> This is needed in preparation of adding support for omap3 and
> later OHCI. The runtime PM will only do something on platforms
> that implement it.
>
> Cc: devicet...@vger.kernel.org
> Cc: Hans de Goede <hdego...@redhat.com>
> Cc: Rob Herring <r...@kernel.org>
> Cc: Roger Quadros <rog...@ti.com>
> Cc: Sebastian Reichel <sebastian.reic...@collabora.co.uk>
> Cc: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
> Signed-off-by: Tony Lindgren <t...@atomide.com>
> ---
>
> Alan, do you have some better ideas for the ohci_platform_remove()
> path below?
>
> ---
> drivers/usb/host/ohci-platform.c | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/host/ohci-platform.c
> b/drivers/usb/host/ohci-platform.c
> --- a/drivers/usb/host/ohci-platform.c
> +++ b/drivers/usb/host/ohci-platform.c
> @@ -24,6 +24,7 @@
> #include <linux/err.h>
> #include <linux/phy/phy.h>
> #include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> #include <linux/reset.h>
> #include <linux/usb/ohci_pdriver.h>
> #include <linux/usb.h>
> @@ -242,6 +243,8 @@ static int ohci_platform_probe(struct platform_device
> *dev)
> }
> #endif
>
> + pm_runtime_set_active(&dev->dev);
> + pm_runtime_enable(&dev->dev);
> if (pdata->power_on) {
> err = pdata->power_on(dev);
> if (err < 0)
> @@ -271,6 +274,7 @@ static int ohci_platform_probe(struct platform_device
> *dev)
> if (pdata->power_off)
> pdata->power_off(dev);
> err_reset:
> + pm_runtime_disable(&dev->dev);
> while (--rst >= 0)
> reset_control_assert(priv->resets[rst]);
> err_put_clks:
> @@ -290,7 +294,14 @@ static int ohci_platform_remove(struct platform_device
> *dev)
> struct usb_hcd *hcd = platform_get_drvdata(dev);
> struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
> struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
> - int clk, rst;
> + int clk, rst, enabled;
> +
> + enabled = pm_runtime_get_sync(&dev->dev);
> + if (enabled < 0) {
> + dev_warn(&dev->dev, "pm_runtime_get failed: %i\n",
> + enabled);
> + pm_runtime_put_noidle(&dev->dev);
> + }
I wouldn't worry about checking the return value. There's no
particular reason for this call to fail, is there?
>
> usb_remove_hcd(hcd);
>
> @@ -305,6 +316,10 @@ static int ohci_platform_remove(struct platform_device
> *dev)
>
> usb_put_hcd(hcd);
>
> + if (enabled >= 0)
> + pm_runtime_put_sync(&dev->dev);
> + pm_runtime_disable(&dev->dev);
And here you could just do the put_sync, with no test. If the get_sync
failed then this will probably fail too, but you won't be any worse off
for the attempt.
Alan Stern
> +
> if (pdata == &ohci_platform_defaults)
> dev->dev.platform_data = NULL;
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