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SubjectRe: usb:xhci: support disable usb2 LPM Remote Wakeup
Hi,
Do you have any feedback on this?

Thanks,
Thang Q. Nguyen

On Sun, Dec 4, 2016 at 7:42 PM, Thang Q. Nguyen <tqnguyen@apm.com> wrote:
> From: Thang Nguyen <tqnguyen@apm.com>
>
> As per USB 2.0 link power management addendum ECN, table 1-2, page 4,
> device or host initiated via resume signaling; device-initiated resumes
> can be optionally enabled/disabled by software. This patch adds support
> to control enabling the USB2 RWE feature via DT/ACPI attribute.
>
> Signed-off-by: Vu Nguyen <vnguyen@apm.com>
> Signed-off-by: Thang Nguyen <tqnguyen@apm.com>
> ---
> Documentation/devicetree/bindings/usb/usb-xhci.txt | 1 +
> drivers/usb/host/xhci-plat.c | 3 +++
> drivers/usb/host/xhci.c | 5 ++++-
> drivers/usb/host/xhci.h | 1 +
> 4 files changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt
> index 966885c..9b4cd14 100644
> --- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
> +++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt
> @@ -25,6 +25,7 @@ Required properties:
>
> Optional properties:
> - clocks: reference to a clock
> + - usb2-rwe-disable: disable USB2 LPM Remote Wakeup capable
> - usb3-lpm-capable: determines if platform is USB3 LPM capable
>
> Example:
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index ed56bf9..15c540d 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -220,6 +220,9 @@ static int xhci_plat_probe(struct platform_device *pdev)
> goto disable_clk;
> }
>
> + if (device_property_read_bool(&pdev->dev, "usb2-rwe-disable"))
> + xhci->quirks |= XHCI_RWE_DISABLE;
> +
> if (device_property_read_bool(&pdev->dev, "usb3-lpm-capable"))
> xhci->quirks |= XHCI_LPM_SUPPORT;
>
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 1a4ca02..f804868 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -4183,7 +4183,10 @@ int xhci_set_usb2_hardware_lpm(struct usb_hcd *hcd,
> }
>
> pm_val &= ~PORT_HIRD_MASK;
> - pm_val |= PORT_HIRD(hird) | PORT_RWE | PORT_L1DS(udev->slot_id);
> + if ((xhci->quirks & XHCI_RWE_DISABLE) && (xhci->hci_version <= 0x100))
> + pm_val |= PORT_HIRD(hird) | PORT_L1DS(udev->slot_id);
> + else
> + pm_val |= PORT_HIRD(hird) | PORT_RWE | PORT_L1DS(udev->slot_id);
> writel(pm_val, pm_addr);
> pm_val = readl(pm_addr);
> pm_val |= PORT_HLE;
> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> index f945380..2b9bc33 100644
> --- a/drivers/usb/host/xhci.h
> +++ b/drivers/usb/host/xhci.h
> @@ -1656,6 +1656,7 @@ struct xhci_hcd {
> #define XHCI_SSIC_PORT_UNUSED (1 << 22)
> #define XHCI_NO_64BIT_SUPPORT (1 << 23)
> #define XHCI_MISSING_CAS (1 << 24)
> +#define XHCI_RWE_DISABLE (1 << 25)
> unsigned int num_active_eps;
> unsigned int limit_active_eps;
> /* There are two roothubs to keep track of bus suspend info for */
> --
> 2.7.4
>



--

Thang Q. Nguyen | Staff SW Eng.

C: +849.7684.7606 | O: +848.3770.0640

F: +848.3770.0641 | tqnguyen@apm.com

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