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SubjectRe: [PATCH v2 RESEND] usb: dwc3: core: Fix ULPI PHYs and prevent phy_get/ulpi_init during suspend/resume
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Hello,

After I apply this patch on 4.14 (or receive it with 4.14.70) I see a regression with
the Qualcomm QUSB2 phy driver. I'm testing on a Dragonboard 820c.
In boot log I get:

[ 4.525502] phy phy-7412000.phy.6: QUSB2PHY pll lock failed: status reg = 0
[ 4.529232] phy phy-7412000.phy.6: phy init failed --> -16
[ 4.536170] dwc3 7600000.dwc3: failed to initialize core
[ 4.541743] dwc3: probe of 7600000.dwc3 failed with error -16
[ 4.549979] phy phy-7411000.phy.5: QUSB2PHY pll lock failed: status reg = 0
[ 4.552843] phy phy-7411000.phy.5: phy init failed --> -16
[ 4.559606] dwc3 6a00000.dwc3: failed to initialize core
[ 4.565181] dwc3: probe of 6a00000.dwc3 failed with error -16

I can provide a full log if needed.

Best regards,
Todor



On 12.02.2018 15:30, Roger Quadros wrote:
> In order for ULPI PHYs to work, dwc3_phy_setup() and dwc3_ulpi_init()
> must be doene before dwc3_core_get_phy().
>
> commit 541768b08a40 ("usb: dwc3: core: Call dwc3_core_get_phy() before initializing phys")
> broke this.
>
> The other issue is that dwc3_core_get_phy() and dwc3_ulpi_init() should
> be called only once during the life cycle of the driver. However,
> as dwc3_core_init() is called during system suspend/resume it will
> result in multiple calls to dwc3_core_get_phy() and dwc3_ulpi_init()
> which is wrong.
>
> Fix this by moving dwc3_ulpi_init() out of dwc3_phy_setup()
> into dwc3_core_ulpi_init(). Use a flag 'ulpi_ready' to ensure that
> dwc3_core_ulpi_init() is called only once from dwc3_core_init().
>
> Use another flag 'phys_ready' to call dwc3_core_get_phy() only once from
> dwc3_core_init().
>
> Fixes: 541768b08a40 ("usb: dwc3: core: Call dwc3_core_get_phy() before initializing phys")
> Fixes: f54edb539c11 ("usb: dwc3: core: initialize ULPI before trying to get the PHY")
> Cc: linux-stable <stable@vger.kernel.org> # >= v4.13
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> ---
> Rebased on Felipe's testing/fixes branch.
>
> drivers/usb/dwc3/core.c | 47 ++++++++++++++++++++++++++++++++++++-----------
> drivers/usb/dwc3/core.h | 5 +++++
> 2 files changed, 41 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 59511f2..f1d838a 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -486,6 +486,22 @@ static void dwc3_cache_hwparams(struct dwc3 *dwc)
> parms->hwparams8 = dwc3_readl(dwc->regs, DWC3_GHWPARAMS8);
> }
>
> +static int dwc3_core_ulpi_init(struct dwc3 *dwc)
> +{
> + int intf;
> + int ret = 0;
> +
> + intf = DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3);
> +
> + if (intf == DWC3_GHWPARAMS3_HSPHY_IFC_ULPI ||
> + (intf == DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI &&
> + dwc->hsphy_interface &&
> + !strncmp(dwc->hsphy_interface, "ulpi", 4)))
> + ret = dwc3_ulpi_init(dwc);
> +
> + return ret;
> +}
> +
> /**
> * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core
> * @dwc: Pointer to our controller context structure
> @@ -497,7 +513,6 @@ static void dwc3_cache_hwparams(struct dwc3 *dwc)
> static int dwc3_phy_setup(struct dwc3 *dwc)
> {
> u32 reg;
> - int ret;
>
> reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
>
> @@ -568,9 +583,6 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
> }
> /* FALLTHROUGH */
> case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI:
> - ret = dwc3_ulpi_init(dwc);
> - if (ret)
> - return ret;
> /* FALLTHROUGH */
> default:
> break;
> @@ -727,6 +739,7 @@ static void dwc3_core_setup_global_control(struct dwc3 *dwc)
> }
>
> static int dwc3_core_get_phy(struct dwc3 *dwc);
> +static int dwc3_core_ulpi_init(struct dwc3 *dwc);
>
> /**
> * dwc3_core_init - Low-level initialization of DWC3 Core
> @@ -758,17 +771,27 @@ static int dwc3_core_init(struct dwc3 *dwc)
> dwc->maximum_speed = USB_SPEED_HIGH;
> }
>
> - ret = dwc3_core_get_phy(dwc);
> + ret = dwc3_phy_setup(dwc);
> if (ret)
> goto err0;
>
> - ret = dwc3_core_soft_reset(dwc);
> - if (ret)
> - goto err0;
> + if (!dwc->ulpi_ready) {
> + ret = dwc3_core_ulpi_init(dwc);
> + if (ret)
> + goto err0;
> + dwc->ulpi_ready = true;
> + }
>
> - ret = dwc3_phy_setup(dwc);
> + if (!dwc->phys_ready) {
> + ret = dwc3_core_get_phy(dwc);
> + if (ret)
> + goto err0a;
> + dwc->phys_ready = true;
> + }
> +
> + ret = dwc3_core_soft_reset(dwc);
> if (ret)
> - goto err0;
> + goto err0a;
>
> dwc3_core_setup_global_control(dwc);
> dwc3_core_num_eps(dwc);
> @@ -841,6 +864,9 @@ static int dwc3_core_init(struct dwc3 *dwc)
> phy_exit(dwc->usb2_generic_phy);
> phy_exit(dwc->usb3_generic_phy);
>
> +err0a:
> + dwc3_ulpi_exit(dwc);
> +
> err0:
> return ret;
> }
> @@ -1235,7 +1261,6 @@ static int dwc3_probe(struct platform_device *pdev)
>
> err3:
> dwc3_free_event_buffers(dwc);
> - dwc3_ulpi_exit(dwc);
>
> err2:
> pm_runtime_allow(&pdev->dev);
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 185b960..860d2bc 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -797,7 +797,9 @@ struct dwc3_scratchpad_array {
> * @usb3_phy: pointer to USB3 PHY
> * @usb2_generic_phy: pointer to USB2 PHY
> * @usb3_generic_phy: pointer to USB3 PHY
> + * @phys_ready: flag to indicate that PHYs are ready
> * @ulpi: pointer to ulpi interface
> + * @ulpi_ready: flag to indicate that ULPI is initialized
> * @u2sel: parameter from Set SEL request.
> * @u2pel: parameter from Set SEL request.
> * @u1sel: parameter from Set SEL request.
> @@ -895,7 +897,10 @@ struct dwc3 {
> struct phy *usb2_generic_phy;
> struct phy *usb3_generic_phy;
>
> + bool phys_ready;
> +
> struct ulpi *ulpi;
> + bool ulpi_ready;
>
> void __iomem *regs;
> size_t regs_size;
>

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