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Subject[PATCH v2] USB: quirks: disable LPM for Logitech UVC devices
Date
From: Kyle Williams <kdgwill@chromium.org>

Description: Some USB device / host controller combinations seem to have
problems with Link Power management. In particular it is described that
the combination of certain Logitech uvc devices and other powered media
devices such causes 'not enough bandwidth for new device state' error.

This patch enables the USB_QUIRK_NO_LPM quirk entries for all connected
Logitech UVC devices indicating LPM should remain disabled for the device.

Signed-off-by: Kyle Williams <kdgwill@chromium.org>
---

Changes in v2:
- changed commit message
- disble lpm for all logitech uvc devices instead of listing manually
- changes to allow the lpm to correctly be disabled after enumeration

drivers/usb/core/hub.c | 87 +++++++++++++++++++++------------------
drivers/usb/core/quirks.c | 2 +-
2 files changed, 49 insertions(+), 40 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 0f9381b69a3b..8f366ec4d21b 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -365,6 +365,51 @@ static void usb_set_lpm_parameters(struct usb_device *udev)
usb_set_lpm_sel(udev, &udev->u2_params);
}

+/*
+ * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM
+ * when they're plugged into a USB 2.0 port, but they don't work when LPM is
+ * enabled.
+ *
+ * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the
+ * device says it supports the new USB 2.0 Link PM errata by setting the BESL
+ * support bit in the BOS descriptor.
+ */
+static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev)
+{
+ struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
+ int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN;
+
+ if (!udev->usb2_hw_lpm_capable || !udev->bos)
+ return;
+
+ if (hub)
+ connect_type = hub->ports[udev->portnum - 1]->connect_type;
+
+ if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT))
+ || connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
+ udev->usb2_hw_lpm_allowed = 1;
+ usb_set_usb2_hardware_lpm(udev, 1);
+ }
+}
+
+void usb_update_device_lpm(struct usb_hcd *hcd, struct usb_device *udev)
+{
+ int retval;
+
+ if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
+ retval = usb_get_bos_descriptor(udev);
+ if (!retval) {
+ udev->lpm_capable = usb_device_supports_lpm(udev);
+ usb_set_lpm_parameters(udev);
+ }
+ }
+
+ /* notify HCD that we have a device connected and addressed */
+ if (hcd->driver->update_device)
+ hcd->driver->update_device(hcd, udev);
+ hub_set_initial_usb2_lpm_policy(udev);
+}
+
/* USB 2.0 spec Section 11.24.4.5 */
static int get_hub_descriptor(struct usb_device *hdev,
struct usb_hub_descriptor *desc)
@@ -2295,7 +2340,6 @@ static int usb_enumerate_device_otg(struct usb_device *udev)
return err;
}

-
/**
* usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal)
* @udev: newly addressed device (in ADDRESS state)
@@ -2351,6 +2395,8 @@ static int usb_enumerate_device(struct usb_device *udev)

usb_detect_interface_quirks(udev);

+ usb_update_device_lpm(hcd, udev);
+
return 0;
}

@@ -4402,33 +4448,6 @@ static int hub_set_address(struct usb_device *udev, int devnum)
return retval;
}

-/*
- * There are reports of USB 3.0 devices that say they support USB 2.0 Link PM
- * when they're plugged into a USB 2.0 port, but they don't work when LPM is
- * enabled.
- *
- * Only enable USB 2.0 Link PM if the port is internal (hardwired), or the
- * device says it supports the new USB 2.0 Link PM errata by setting the BESL
- * support bit in the BOS descriptor.
- */
-static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev)
-{
- struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent);
- int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN;
-
- if (!udev->usb2_hw_lpm_capable || !udev->bos)
- return;
-
- if (hub)
- connect_type = hub->ports[udev->portnum - 1]->connect_type;
-
- if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) ||
- connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) {
- udev->usb2_hw_lpm_allowed = 1;
- usb_set_usb2_hardware_lpm(udev, 1);
- }
-}
-
static int hub_enable_device(struct usb_device *udev)
{
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
@@ -4779,19 +4798,9 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,

usb_detect_quirks(udev);

- if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
- retval = usb_get_bos_descriptor(udev);
- if (!retval) {
- udev->lpm_capable = usb_device_supports_lpm(udev);
- usb_set_lpm_parameters(udev);
- }
- }
+ usb_update_device_lpm(hcd, udev);

retval = 0;
- /* notify HCD that we have a device connected and addressed */
- if (hcd->driver->update_device)
- hcd->driver->update_device(hcd, udev);
- hub_set_initial_usb2_lpm_policy(udev);
fail:
if (retval) {
hub_port_disable(hub, port1, 0);
diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index 0690fcff0ea2..bbbb7e6df958 100644
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -440,7 +440,7 @@ static const struct usb_device_id usb_quirk_list[] = {
static const struct usb_device_id usb_interface_quirk_list[] = {
/* Logitech UVC Cameras */
{ USB_VENDOR_AND_INTERFACE_INFO(0x046d, USB_CLASS_VIDEO, 1, 0),
- .driver_info = USB_QUIRK_RESET_RESUME },
+ .driver_info = USB_QUIRK_RESET_RESUME | USB_QUIRK_NO_LPM },

{ } /* terminating entry must be last */
};
--
2.20.0.rc2.403.gdbc3b29805-goog
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