diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0222-usb-add-plumbing-for-updating-interrupt-endpoint-int.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0222-usb-add-plumbing-for-updating-interrupt-endpoint-int.patch | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0222-usb-add-plumbing-for-updating-interrupt-endpoint-int.patch b/target/linux/bcm27xx/patches-5.4/950-0222-usb-add-plumbing-for-updating-interrupt-endpoint-int.patch new file mode 100644 index 0000000000..fe1d069c20 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0222-usb-add-plumbing-for-updating-interrupt-endpoint-int.patch @@ -0,0 +1,104 @@ +From 2669f337d78306667e4243fda9282fb8c07d0d3d Mon Sep 17 00:00:00 2001 +From: Jonathan Bell <jonathan@raspberrypi.org> +Date: Tue, 11 Jun 2019 10:55:00 +0100 +Subject: [PATCH] usb: add plumbing for updating interrupt endpoint + interval state + +xHCI caches device and endpoint data after the interface is configured, +so an explicit command needs to be issued for any device driver wanting +to alter the polling interval of an endpoint. + +Add usb_fixup_endpoint() to allow drivers to do this. The fixup must be +called after calculating endpoint bandwidth requirements but before any +URBs are submitted. + +If polling intervals are shortened, any bandwidth reservations are no +longer valid but in practice polling intervals are only ever relaxed. + +Limit the scope to interrupt transfers for now. + +Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org> +--- + drivers/usb/core/hcd.c | 10 ++++++++++ + drivers/usb/core/message.c | 15 +++++++++++++++ + include/linux/usb.h | 2 ++ + include/linux/usb/hcd.h | 7 +++++++ + 4 files changed, 34 insertions(+) + +--- a/drivers/usb/core/hcd.c ++++ b/drivers/usb/core/hcd.c +@@ -1941,6 +1941,16 @@ reset: + return ret; + } + ++void usb_hcd_fixup_endpoint(struct usb_device *udev, ++ struct usb_host_endpoint *ep, int interval) ++{ ++ struct usb_hcd *hcd; ++ ++ hcd = bus_to_hcd(udev->bus); ++ if (hcd->driver->fixup_endpoint) ++ hcd->driver->fixup_endpoint(hcd, udev, ep, interval); ++} ++ + /* Disables the endpoint: synchronizes with the hcd to make sure all + * endpoint state is gone from hardware. usb_hcd_flush_endpoint() must + * have been called previously. Use for set_configuration, set_interface, +--- a/drivers/usb/core/message.c ++++ b/drivers/usb/core/message.c +@@ -1113,6 +1113,21 @@ static void remove_intf_ep_devs(struct u + intf->ep_devs_created = 0; + } + ++void usb_fixup_endpoint(struct usb_device *dev, int epaddr, int interval) ++{ ++ unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK; ++ struct usb_host_endpoint *ep; ++ ++ if (usb_endpoint_out(epaddr)) ++ ep = dev->ep_out[epnum]; ++ else ++ ep = dev->ep_in[epnum]; ++ ++ if (ep && usb_endpoint_xfer_int(&ep->desc)) ++ usb_hcd_fixup_endpoint(dev, ep, interval); ++} ++EXPORT_SYMBOL_GPL(usb_fixup_endpoint); ++ + /** + * usb_disable_endpoint -- Disable an endpoint by address + * @dev: the device whose endpoint is being disabled +--- a/include/linux/usb.h ++++ b/include/linux/usb.h +@@ -1816,6 +1816,8 @@ extern int usb_clear_halt(struct usb_dev + extern int usb_reset_configuration(struct usb_device *dev); + extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate); + extern void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr); ++extern void usb_fixup_endpoint(struct usb_device *dev, int epaddr, ++ int interval); + + /* this request isn't really synchronous, but it belongs with the others */ + extern int usb_driver_set_configuration(struct usb_device *udev, int config); +--- a/include/linux/usb/hcd.h ++++ b/include/linux/usb/hcd.h +@@ -382,6 +382,11 @@ struct hc_driver { + * or bandwidth constraints. + */ + void (*reset_bandwidth)(struct usb_hcd *, struct usb_device *); ++ /* Override the endpoint-derived interval ++ * (if there is any cached hardware state). ++ */ ++ void (*fixup_endpoint)(struct usb_hcd *hcd, struct usb_device *udev, ++ struct usb_host_endpoint *ep, int interval); + /* Returns the hardware-chosen device address */ + int (*address_device)(struct usb_hcd *, struct usb_device *udev); + /* prepares the hardware to send commands to the device */ +@@ -443,6 +448,8 @@ extern void usb_hcd_unmap_urb_setup_for_ + extern void usb_hcd_unmap_urb_for_dma(struct usb_hcd *, struct urb *); + extern void usb_hcd_flush_endpoint(struct usb_device *udev, + struct usb_host_endpoint *ep); ++extern void usb_hcd_fixup_endpoint(struct usb_device *udev, ++ struct usb_host_endpoint *ep, int interval); + extern void usb_hcd_disable_endpoint(struct usb_device *udev, + struct usb_host_endpoint *ep); + extern void usb_hcd_reset_endpoint(struct usb_device *udev, |