Re: [PATCH 2/7] usb: dwc3: adapt dwc3 core to use Generic PHY Framework

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On Tue, Oct 15, 2013 at 11:01:16AM +0530, Kishon Vijay Abraham I wrote:
> Hi Roger,
> 
> On Monday 14 October 2013 03:51 PM, Roger Quadros wrote:
> > +Vivek
> > 
> > On 10/14/2013 12:26 PM, Kishon Vijay Abraham I wrote:
> >> Hi Roger,
> >>
> >> On Friday 11 October 2013 08:39 PM, Roger Quadros wrote:
> >>> Hi,
> >>>
> >>> On 09/02/2013 06:43 PM, Kishon Vijay Abraham I wrote:
> >>>> Adapted dwc3 core to use the Generic PHY Framework. So for init, exit,
> >>>> power_on and power_off the following APIs are used phy_init(), phy_exit(),
> >>>> phy_power_on() and phy_power_off().
> >>>>
> >>>> However using the old USB phy library wont be removed till the PHYs of all
> >>>> other SoC's using dwc3 core is adapted to the Generic PHY Framework.
> >>>>
> >>>> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
> >>>> ---
> >>>>  Documentation/devicetree/bindings/usb/dwc3.txt |    6 ++-
> >>>>  drivers/usb/dwc3/Kconfig                       |    1 +
> >>>>  drivers/usb/dwc3/core.c                        |   49 ++++++++++++++++++++++++
> >>>>  drivers/usb/dwc3/core.h                        |    7 ++++
> >>>>  4 files changed, 61 insertions(+), 2 deletions(-)
> >>>>
> >>>> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
> >>>> index e807635..471366d 100644
> >>>> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
> >>>> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
> >>>> @@ -6,11 +6,13 @@ Required properties:
> >>>>   - compatible: must be "snps,dwc3"
> >>>>   - reg : Address and length of the register set for the device
> >>>>   - interrupts: Interrupts used by the dwc3 controller.
> >>>> +
> >>>> +Optional properties:
> >>>>   - usb-phy : array of phandle for the PHY device.  The first element
> >>>>     in the array is expected to be a handle to the USB2/HS PHY and
> >>>>     the second element is expected to be a handle to the USB3/SS PHY
> >>>> -
> >>>> -Optional properties:
> >>>> + - phys: from the *Generic PHY* bindings
> >>>> + - phy-names: from the *Generic PHY* bindings
> >>>>   - tx-fifo-resize: determines if the FIFO *has* to be reallocated.
> >>>>  
> >>>>  This is usually a subnode to DWC3 glue to which it is connected.
> >>>> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
> >>>> index cfc16dd..ad7ce83 100644
> >>>> --- a/drivers/usb/dwc3/Kconfig
> >>>> +++ b/drivers/usb/dwc3/Kconfig
> >>>> @@ -3,6 +3,7 @@ config USB_DWC3
> >>>>  	depends on (USB || USB_GADGET) && GENERIC_HARDIRQS && HAS_DMA
> >>>>  	depends on EXTCON
> >>>>  	select USB_PHY
> >>>> +	select GENERIC_PHY
> >>>>  	select USB_XHCI_PLATFORM if USB_SUPPORT && USB_XHCI_HCD
> >>>>  	help
> >>>>  	  Say Y or M here if your system has a Dual Role SuperSpeed
> >>>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> >>>> index 428c29e..485d365 100644
> >>>> --- a/drivers/usb/dwc3/core.c
> >>>> +++ b/drivers/usb/dwc3/core.c
> >>>> @@ -82,6 +82,12 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
> >>>>  
> >>>>  	usb_phy_init(dwc->usb2_phy);
> >>>>  	usb_phy_init(dwc->usb3_phy);
> >>>
> >>> How about adding
> >>> +	if (dwc->usb2_phy)
> >>> +		usb_phy_init(dwc->usb2_phy);
> >>> +	if (dwc->usb3_phy)
> >>> +		usb_phy_init(dwc->usb3_phy);
> >>
> >> Thankfully that usb_phy_init will check if phy is NULL.
> >>>
> >>> both usb phy and generic phy shouldn't be present together.
> >>
> >> ok.
> >>>
> >>>> +
> >>>> +	if (dwc->usb2_generic_phy)
> >>>> +		phy_init(dwc->usb2_generic_phy);
> >>>> +	if (dwc->usb3_generic_phy)
> >>>> +		phy_init(dwc->usb3_generic_phy);
> >>>> +
> >>>>  	mdelay(100);
> >>>>  
> >>>>  	/* Clear USB3 PHY reset */
> >>>> @@ -343,6 +349,11 @@ static void dwc3_core_exit(struct dwc3 *dwc)
> >>>>  {
> >>>>  	usb_phy_shutdown(dwc->usb2_phy);
> >>>>  	usb_phy_shutdown(dwc->usb3_phy);
> >>>
> >>> here as well
> >>>
> >>>> +
> >>>> +	if (dwc->usb2_generic_phy)
> >>>> +		phy_power_off(dwc->usb2_generic_phy);
> >>>> +	if (dwc->usb3_generic_phy)
> >>>> +		phy_power_off(dwc->usb3_generic_phy);
> >>>>  }
> >>>>  
> >>>>  #define DWC3_ALIGN_MASK		(16 - 1)
> >>>> @@ -427,6 +438,23 @@ static int dwc3_probe(struct platform_device *pdev)
> >>>>  		dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
> >>>>  	}
> >>>>  
> >>>> +	if (of_property_read_bool(node, "phys") || pdata->has_phy) {
> >>>> +		dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
> >>>> +		if (IS_ERR(dwc->usb2_generic_phy)) {
> >>>> +			dev_err(dev, "no usb2 phy configured yet");
> >>>> +			return PTR_ERR(dwc->usb2_generic_phy);
> >>>> +		}
> >>>> +
> >>>> +		dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy");
> >>>> +		if (IS_ERR(dwc->usb3_generic_phy)) {
> >>>> +			dev_err(dev, "no usb3 phy configured yet");
> >>>> +			return PTR_ERR(dwc->usb3_generic_phy);
> >>>> +		}
> >>>
> >>> better to add
> >>> +		/* Don't use USB PHY if generic PHY was found */
> >>> +		dwc->usb2_phy = dwc->usb3_phy = NULL;
> >>
> >> ok.
> >>>
> >>>> +	} else {
> >>>
> >>> not required as we've used kzalloc for dwc.
> >>>
> >>>> +		dwc->usb2_generic_phy = NULL;
> >>>> +		dwc->usb3_generic_phy = NULL;
> >>>> +	}
> >>>> +
> >>>>  	/* default to superspeed if no maximum_speed passed */
> >>>>  	if (dwc->maximum_speed == USB_SPEED_UNKNOWN)
> >>>>  		dwc->maximum_speed = USB_SPEED_SUPER;
> >>>> @@ -450,6 +478,11 @@ static int dwc3_probe(struct platform_device *pdev)
> >>>
> >>> if (dwc->usb2_phy)
> >>>
> >>>>  	usb_phy_set_suspend(dwc->usb2_phy, 0);
> >>>
> >>> if (dwc->usb3_phy)
> >>>
> >>>>  	usb_phy_set_suspend(dwc->usb3_phy, 0);
> >>>>  
> >>>> +	if (dwc->usb2_generic_phy)
> >>>> +		phy_power_on(dwc->usb2_generic_phy);
> >>>> +	if (dwc->usb3_generic_phy)
> >>>> +		phy_power_on(dwc->usb3_generic_phy);
> >>>> +
> >>>>  	spin_lock_init(&dwc->lock);
> >>>>  	platform_set_drvdata(pdev, dwc);
> >>>>  
> >>>> @@ -576,6 +609,11 @@ static int dwc3_remove(struct platform_device *pdev)
> >>>
> >>> if (dwc->usb2_phy)
> >>>>  	usb_phy_set_suspend(dwc->usb2_phy, 1);
> >>>
> >>> if (dwc->usb3_phy)
> >>>>  	usb_phy_set_suspend(dwc->usb3_phy, 1);
> >>>>  
> >>>> +	if (dwc->usb2_generic_phy)
> >>>> +		phy_power_off(dwc->usb2_generic_phy);
> >>>> +	if (dwc->usb3_generic_phy)
> >>>> +		phy_power_off(dwc->usb3_generic_phy);
> >>>> +
> >>>>  	pm_runtime_put(&pdev->dev);
> >>>>  	pm_runtime_disable(&pdev->dev);
> >>>>  
> >>>> @@ -673,6 +711,11 @@ static int dwc3_suspend(struct device *dev)
> >>>
> >>> if (dwc->usb3_phy)
> >>>>  	usb_phy_shutdown(dwc->usb3_phy);
> >>>
> >>> if (dwc->usb2_phy)
> >>>>  	usb_phy_shutdown(dwc->usb2_phy);
> >>>>  
> >>>> +	if (dwc->usb2_generic_phy)
> >>>> +		phy_exit(dwc->usb2_generic_phy);
> >>>> +	if (dwc->usb3_generic_phy)
> >>>> +		phy_exit(dwc->usb3_generic_phy);
> >>>> +
> >>>>  	return 0;
> >>>>  }
> >>>>  
> >>>> @@ -683,6 +726,12 @@ static int dwc3_resume(struct device *dev)
> >>>>  
> >>>
> >>> if (dwc->usb3_phy)
> >>>>  	usb_phy_init(dwc->usb3_phy);
> >>>
> >>> if (dwc->usb2_phy)
> >>>>  	usb_phy_init(dwc->usb2_phy);
> >>>> +
> >>>> +	if (dwc->usb2_generic_phy)
> >>>> +		phy_init(dwc->usb2_generic_phy);
> >>>> +	if (dwc->usb3_generic_phy)
> >>>> +		phy_init(dwc->usb3_generic_phy);
> >>>> +
> >>>>  	msleep(100);
> >>>>  
> >>>>  	spin_lock_irqsave(&dwc->lock, flags);
> >>>> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> >>>> index f8af8d4..01ec7d7 100644
> >>>> --- a/drivers/usb/dwc3/core.h
> >>>> +++ b/drivers/usb/dwc3/core.h
> >>>> @@ -31,6 +31,8 @@
> >>>>  #include <linux/usb/gadget.h>
> >>>>  #include <linux/usb/otg.h>
> >>>>  
> >>>> +#include <linux/phy/phy.h>
> >>>> +
> >>>>  /* Global constants */
> >>>>  #define DWC3_EP0_BOUNCE_SIZE	512
> >>>>  #define DWC3_ENDPOINTS_NUM	32
> >>>> @@ -613,6 +615,8 @@ struct dwc3_scratchpad_array {
> >>>>   * @dr_mode: requested mode of operation
> >>>>   * @usb2_phy: pointer to USB2 PHY
> >>>>   * @usb3_phy: pointer to USB3 PHY
> >>>> + * @usb2_generic_phy: pointer to USB2 PHY
> >>>> + * @usb3_generic_phy: pointer to USB3 PHY
> >>>>   * @dcfg: saved contents of DCFG register
> >>>>   * @gctl: saved contents of GCTL register
> >>>>   * @is_selfpowered: true when we are selfpowered
> >>>> @@ -665,6 +669,9 @@ struct dwc3 {
> >>>>  	struct usb_phy		*usb2_phy;
> >>>>  	struct usb_phy		*usb3_phy;
> >>>>  
> >>>> +	struct phy		*usb2_generic_phy;
> >>>> +	struct phy		*usb3_generic_phy;
> >>>> +
> >>>>  	void __iomem		*regs;
> >>>>  	size_t			regs_size;
> >>>>  
> >>>>
> >>
> >> Do you have any suggestions on how to get only individual PHYs? like only
> >> usb2phy or usb3phy?
> > 
> > My earlier understanding was that both PHYs are needed only if .speed is "super-speed"
> > and only usb2phy is needed for "high-speed". But as per Vivek's email it seems
> > Samsung's exynos5 SoC doesn't need usb2phy for "super-speed".
> > 
> > So to keeps things flexible, I can propose the following approach
> > - if speed == 'high-speed' usb2phy must be present. usb3phy will be ignored if supplied.
> > - if speed == 'super-speed' usb3phy must be present and usb2phy is optional but must be
> > initialized if supplied.
> > - if speed is not specified, we default to 'super-speed'.
> > 
> > Felipe, does this address the issue you were facing with OMAP5?
> 
> IIRC, even if the speed is high speed, you still need to power on the USB3 PHY.
> Or else even high speed mode wasn't working in OMAP5.

right

-- 
balbi

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