Hi Alan, As you saw, I think the version 4 is better than this, can we take the version 4? Best Regards, Wenyou Yang > -----Original Message----- > From: Wenyou.Yang@xxxxxxxxxxxxx [mailto:Wenyou.Yang@xxxxxxxxxxxxx] > Sent: 2016年8月5日 11:46 > To: stern@xxxxxxxxxxxxxxxxxxx; wenyou.yang@xxxxxxxxx > Cc: gregkh@xxxxxxxxxxxxxxxxxxx; nicolas.ferre@xxxxxxxxx; > alexandre.belloni@xxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx > Subject: RE: [PATCH v5] usb: ohci-at91: Forcibly suspend ports while USB > suspend > > Hi Alan, > > > -----Original Message----- > > From: Alan Stern [mailto:stern@xxxxxxxxxxxxxxxxxxx] > > Sent: 2016年8月4日 23:02 > > To: Wenyou Yang <wenyou.yang@xxxxxxxxx> > > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>; Nicolas Ferre > > <nicolas.ferre@xxxxxxxxx>; Alexandre Belloni <alexandre.belloni@free- > > electrons.com>; linux-kernel@xxxxxxxxxxxxxxx; linux-arm- > > kernel@xxxxxxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx > > Subject: Re: [PATCH v5] usb: ohci-at91: Forcibly suspend ports while > > USB suspend > > > > On Thu, 4 Aug 2016, Wenyou Yang wrote: > > > > > The usb controller does not managed correctly the suspend mode for > > > the ehci. In echi mode, there is no way to have utmi_suspend_o_n[1] > > > suspend without any device connected to it. This is why this > > > specific control is added to fix this issue. The suspend mode works > > > in ohci mode. > > > > Why are you talking about EHCI mode? This patch is only for the > > ohci-at91 driver. > > Actually I described the issue according to the documents from our IP, and this > specific control is recommended to do in ohci mode. > > > > > > This specific control is by setting the SUSPEND_A/B/C fields of > > > SFR_OHCIICR(OHCI Interrupt Configuration Register) in the SFR while > > > OHCI USB suspend. > > > > > > This setting operation must be done before the USB clock disabled, > > > clear them after the USB clock enabled. > > > > > > Signed-off-by: Wenyou Yang <wenyou.yang@xxxxxxxxx> > > > Reviewed-by: Alexandre Belloni > > > <alexandre.belloni@xxxxxxxxxxxxxxxxxx> > > > Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx> > > > > I don't know if this is any better than before! See the comments below. > > Yes, I think so. > > What else advice? > > > > > > --- > > > > > > Changes in v5: > > > - Use the USB_PORT_FEAT_SUSPEND subcase of the SetPortFeature case > > > to take care it. > > > - Update the commit log. > > > > > > Changes in v4: > > > - To check whether the SFR node with "atmel,sama5d2-sfr" compatible > > > is present or not to decide if this feature is applied or not > > > when USB OHCI suspend/resume, instead of new compatible. > > > - Drop the compatible "atmel,sama5d2-ohci". > > > - Drop [PATCH 2/2] ARM: at91/dt: sama5d2: Use new compatible for > > > ohci node. > > > - Drop include/soc/at91/at91_sfr.h, move the macro definitions to > > > atmel-sfr.h which already exists. > > > - Change the defines to align the exists. > > > > > > Changes in v3: > > > - Change the compatible description for more precise. > > > > > > Changes in v2: > > > - Add compatible to support forcibly suspend the ports. > > > - Add soc/at91/at91_sfr.h to accommodate the defines. > > > - Add error checking for .sfr_regmap. > > > - Remove unnecessary regmap_read() statement. > > > > > > > @@ -282,6 +301,28 @@ static int ohci_at91_hub_status_data(struct > > > usb_hcd > > *hcd, char *buf) > > > return length; > > > } > > > > > > +static int ohci_at91_port_ctrl(struct regmap *regmap, u16 port, u8 > > > +set) { > > > + u32 regval; > > > + int ret; > > > + > > > + if (!regmap) > > > + return 0; > > > + > > > + ret = regmap_read(regmap, AT91_SFR_OHCIICR, ®val); > > > + if (ret) > > > + return ret; > > > + > > > + if (set) > > > + regval |= AT91_OHCIICR_SUSPEND(port); > > > + else > > > + regval &= ~AT91_OHCIICR_SUSPEND(port); > > > > In the earlier versions of this patch, you did not use the port number. > > Why has this changed? > > This function is called by ohci_at91_hub_control(), which is invoked on basis of > port number. > > So, I think it is more reasonable of adding the port argument. > > > > > How many ports does this controller have? > > This controller has three ports. > > > > > > + > > > + regmap_write(regmap, AT91_SFR_OHCIICR, regval); > > > + > > > + return 0; > > > +} > > > + > > > /* > > > * Look at the control requests to the root hub and see if we need to override. > > > */ > > > @@ -289,6 +330,7 @@ static int ohci_at91_hub_control(struct usb_hcd > > > *hcd, > > u16 typeReq, u16 wValue, > > > u16 wIndex, char *buf, u16 wLength) { > > > struct at91_usbh_data *pdata = > > > dev_get_platdata(hcd->self.controller); > > > + struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); > > > struct usb_hub_descriptor *desc; > > > int ret = -EINVAL; > > > u32 *data = (u32 *)buf; > > > @@ -301,7 +343,8 @@ static int ohci_at91_hub_control(struct usb_hcd > > > *hcd, u16 typeReq, u16 wValue, > > > > > > switch (typeReq) { > > > case SetPortFeature: > > > - if (wValue == USB_PORT_FEAT_POWER) { > > > + switch (wValue) { > > > + case USB_PORT_FEAT_POWER: > > > dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n"); > > > if (valid_port(wIndex)) { > > > ohci_at91_usb_set_power(pdata, wIndex, 1); @@ > > -309,6 +352,11 @@ > > > static int ohci_at91_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 > wValue, > > > } > > > > > > goto out; > > > + > > > + case USB_PORT_FEAT_SUSPEND: > > > + dev_dbg(hcd->self.controller, "SetPortFeat: SUSPEND\n"); > > > + ohci_at91_port_ctrl(ohci_at91->sfr_regmap, wIndex, 1); > > > + break; > > > } > > > break; > > > > > > @@ -342,6 +390,12 @@ static int ohci_at91_hub_control(struct usb_hcd > > > *hcd, > > u16 typeReq, u16 wValue, > > > ohci_at91_usb_set_power(pdata, wIndex, 0); > > > return 0; > > > } > > > + break; > > > + > > > + case USB_PORT_FEAT_SUSPEND: > > > + dev_dbg(hcd->self.controller, "ClearPortFeature: > > SUSPEND\n"); > > > + ohci_at91_port_ctrl(ohci_at91->sfr_regmap, wIndex, 0); > > > + break; > > > } > > > break; > > > } > > > > Note that after all this, the code goes ahead to call ohci_bub_control(). > > Yes, > The ohci_bub_control() will change the port_status[port] register after this > operation. > > > > > > @@ -587,7 +641,8 @@ ohci_hcd_at91_drv_suspend(struct device *dev) > > > struct usb_hcd *hcd = dev_get_drvdata(dev); > > > struct ohci_hcd *ohci = hcd_to_ohci(hcd); > > > struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); > > > - int ret; > > > + u16 i; > > > + int ret; > > > > > > /* > > > * Disable wakeup if we are going to sleep with slow clock mode @@ > > > -599,6 +654,11 @@ ohci_hcd_at91_drv_suspend(struct device *dev) > > > if (ohci_at91->wakeup) > > > enable_irq_wake(hcd->irq); > > > > > > + for (i = 0; i < ohci->num_ports; i++) { > > > + ohci_at91_hub_control(hcd, SetPortFeature, > > > + USB_PORT_FEAT_SUSPEND, (i + 1), NULL, > > 0); > > > + } > > > + > > > ret = ohci_suspend(hcd, ohci_at91->wakeup); > > > > Do you really want to call ohci_hub_control() for ports that don't > > have a device attached? > > Yes. I need to do this operation for ports that don't have a device attached. > > > > > > if (ret) { > > > if (ohci_at91->wakeup) > > > @@ -630,7 +690,9 @@ static int __maybe_unused > > > ohci_hcd_at91_drv_resume(struct device *dev) { > > > struct usb_hcd *hcd = dev_get_drvdata(dev); > > > + struct ohci_hcd *ohci = hcd_to_ohci(hcd); > > > struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); > > > + u16 i; > > > > > > if (ohci_at91->wakeup) > > > disable_irq_wake(hcd->irq); > > > @@ -638,6 +700,12 @@ ohci_hcd_at91_drv_resume(struct device *dev) > > > at91_start_clock(ohci_at91); > > > > > > ohci_resume(hcd, false); > > > + > > > + for (i = 0; i < ohci->num_ports; i++) { > > > + ohci_at91_hub_control(hcd, ClearPortFeature, > > > + USB_PORT_FEAT_SUSPEND, i + 1, NULL, > > 0); > > > + } > > > > Have you thought about how this will interact with runtime PM? > > > > If you intend to do this only for system suspend and not for runtime > > suspend, why not set all the suspend bits for all the ports in the > > OHCIICR register at once, in a single write, like you were doing before? > > Yes, this is only for system suspend. > > As I mentioned above, here calls ohci_at91_hub_control(), which is based on port > number. > > > > > Alan Stern > > > Best Regards, > Wenyou Yang ?韬{.n?????%??檩??w?{.n???{炳???骅w* jg????????G??⒏ ⒎?:+v???????? ????＂??????
