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Date: Tue, 15 Oct 2013 06:58:28 -0500
From: Felipe Balbi <balbi@...com>
To: Kishon Vijay Abraham I <kishon@...com>
CC: Roger Quadros <rogerq@...com>, <balbi@...com>,
Vivek Gautam <gautamvivek1987@...il.com>,
<bcousson@...libre.com>, <tony@...mide.com>,
<rob.herring@...xeda.com>, <pawel.moll@....com>,
<mark.rutland@....com>, <linux@....linux.org.uk>,
<grant.likely@...aro.org>, <s.nawrocki@...sung.com>,
<galak@...eaurora.org>, <swarren@...dotorg.org>,
<ian.campbell@...rix.com>, <rob@...dley.net>,
<george.cherian@...com>, <gregkh@...uxfoundation.org>,
<linux-doc@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<devicetree@...r.kernel.org>, <linux-usb@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/7] usb: dwc3: adapt dwc3 core to use Generic PHY
Framework
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@...com>
> >>>> ---
> >>>> 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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