This patch enables hub device to override its own endpoint descriptor's bInterval when the hub has a device node with "hub,interval" property. When we know reducing autosuspend delay for built-in HIDs is better for power saving, we can reduce it to the optimal value. But if a parent hub has a long bInterval, mouse lags a lot from more frequent autosuspend. So this enables overriding bInterval for a hard wired hub device only when we know that reduces the power consumption. Signed-off-by: Ikjoon Jang <ikjn@xxxxxxxxxxxx> Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/core/config.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c index 5f40117e68e7..1939f2ff87ef 100644 --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -6,6 +6,7 @@ #include <linux/usb.h> #include <linux/usb/ch9.h> #include <linux/usb/hcd.h> +#include <linux/usb/of.h> #include <linux/usb/quirks.h> #include <linux/module.h> #include <linux/slab.h> @@ -257,6 +258,11 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, memcpy(&endpoint->desc, d, n); INIT_LIST_HEAD(&endpoint->urb_list); + /* device node property overrides bInterval */ + if (usb_of_has_combined_node(to_usb_device(ddev))) + of_property_read_u8(ddev->of_node, "hub,interval", + &d->bInterval); + /* * Fix up bInterval values outside the legal range. * Use 10 or 8 ms if no proper value can be guessed. -- 2.24.0.432.g9d3f5f5b63-goog
