> -----Original Message----- > From: Alan Stern [mailto:st...@rowland.harvard.edu] > Sent: Friday, August 14, 2015 12:17 AM > To: Mehresh Ramneek-B31383 <ramneek.mehr...@freescale.com> > Cc: linux-ker...@vger.kernel.org; ba...@ti.com; > gre...@linuxfoundation.org; linux-usb@vger.kernel.org; Li Yang-Leo-R58472 > <le...@freescale.com> > Subject: Re: [PATCH 3/8][v3]usb:fsl:otg: Add support to add/remove usb > host driver > > On Thu, 13 Aug 2015, Ramneek Mehresh wrote: > > > Add workqueue to add/remove host driver (outside > > interrupt context) upon each id change. > > > > Signed-off-by: Li Yang <le...@freescale.com> > > Signed-off-by: Ramneek Mehresh <ramneek.mehr...@freescale.com> > > --- > > Changes for v3: > > - removed CONFIG_FSL_USB2_OTG and > CONFIG_FSL_USB2_OTG_MODULE > > macros > > - removed call to usb_hcd_resume_root_hub(hcd) from > > ehci_fsl_drv_resume() > > > > drivers/usb/host/ehci-fsl.c | 71 ++++++++++++++++++++++++++++++++- > ------------ > > drivers/usb/host/ehci-fsl.h | 18 ++++++++++++ > > 2 files changed, 69 insertions(+), 20 deletions(-) > > > > static int ehci_fsl_drv_suspend(struct device *dev) > > { > > struct usb_hcd *hcd = dev_get_drvdata(dev); > > - struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd); > > void __iomem *non_ehci = hcd->regs; > > + struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd); > > + struct usb_bus host = hcd->self; > > I just noticed this line. It does not look right at all; it does a > structure copy instead of copying a pointer. my bad...will change to struct usb_bus *host = &hcd->self; > > > > > if (of_device_is_compatible(dev->parent->of_node, > > "fsl,mpc5121-usb2-dr")) { > > return ehci_fsl_mpc512x_drv_suspend(dev); > > } > > > > + if (host.is_otg) { > > + /* remove hcd */ > > + ehci_fsl->hcd_add = 0; > > + schedule_work(&ehci_fsl->change_hcd_work); > > + host.is_otg = 0; > > And here you turn off the flag in the local copy of the structure, > which accomplishes nothing. > agree...will change to host->is_otg = 0; > > + return 0; > > + } > > + > > ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd), > > device_may_wakeup(dev)); > > if (!fsl_deep_sleep()) > > @@ -557,15 +579,24 @@ static int ehci_fsl_drv_suspend(struct device > *dev) > > static int ehci_fsl_drv_resume(struct device *dev) > > { > > struct usb_hcd *hcd = dev_get_drvdata(dev); > > - struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd); > > struct ehci_hcd *ehci = hcd_to_ehci(hcd); > > void __iomem *non_ehci = hcd->regs; > > + struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd); > > + struct usb_bus host = hcd->self; > > Same here. agree > > > --- a/drivers/usb/host/ehci-fsl.h > > +++ b/drivers/usb/host/ehci-fsl.h > > @@ -63,4 +63,22 @@ > > #define UTMI_PHY_EN (1<<9) > > #define ULPI_PHY_CLK_SEL (1<<10) > > #define PHY_CLK_VALID (1<<17) > > + > > +struct ehci_fsl { > > +#ifdef CONFIG_PM > > + /* Saved USB PHY settings, need to restore after deep sleep. */ > > + u32 usb_ctrl; > > +#endif > > Do you need this #ifdef? > Yes, this is required for deep-sleep support...we need to save/restore controller registers during deep-sleep when usb controller power is shut-off. Don't need this during normal usb operation...saving/restoring usb controller registers in non deep-sleep scenario will add unnecessary delays > Alan Stern
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