This patch implements the notify entry defined in hc_driver for xHC
driver. For HCD_MSG_DEV_SUSPEND message, it will issue stop endpoint
command for each endpoint in the device. The Suspend(SP) bit in the
command TRB will be set, which gives xHC a hint about the suspend.
For HCD_MSG_DEV_RESUME, it will ring doorbells for all endpoints
unconditionally. XHC may use these hints to optimize its operation
on endpoint state cashes.
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-hub.c | 2 +-
drivers/usb/host/xhci.c | 28 ++++++++++++++++++++++++++++
drivers/usb/host/xhci.h | 3 +++
3 files changed, 32 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 0827d7c..a83e82e 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -266,7 +266,7 @@ int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
* to complete.
* suspend will set to 1, if suspend bit need to set in command.
*/
-static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
+int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
{
struct xhci_virt_device *virt_dev;
struct xhci_command *cmd;
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index ec8ac16..1e4aa78 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4917,6 +4917,29 @@ error:
}
EXPORT_SYMBOL_GPL(xhci_gen_setup);
+void xhci_notify(struct usb_hcd *hcd, struct usb_device *udev,
+ enum hcd_notification_type type, void *data)
+{
+ struct xhci_hcd *xhci;
+
+ xhci = hcd_to_xhci(hcd);
+ if (!xhci || !xhci->devs[udev->slot_id])
+ return;
+
+ switch (type) {
+ case HCD_MSG_DEV_SUSPEND:
+ xhci_stop_device(xhci, udev->slot_id, 1);
+ break;
+ case HCD_MSG_DEV_RESUME:
+ xhci_ring_device(xhci, udev->slot_id);
+ break;
+ default:
+ xhci_dbg(xhci, "unknown notification message %d.\n", type);
+ break;
+ }
+
+}
+
static const struct hc_driver xhci_hc_driver = {
.description = "xhci-hcd",
.product_desc = "xHCI Host Controller",
@@ -4976,6 +4999,11 @@ static const struct hc_driver xhci_hc_driver = {
.enable_usb3_lpm_timeout = xhci_enable_usb3_lpm_timeout,
.disable_usb3_lpm_timeout = xhci_disable_usb3_lpm_timeout,
.find_raw_port_number = xhci_find_raw_port_number,
+
+ /*
+ * notification call back
+ */
+ .notify = xhci_notify,
};
void xhci_init_driver(struct hc_driver *drv, int (*setup_fn)(struct usb_hcd *))
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 8e421b8..f71c643 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1867,10 +1867,13 @@ u32 xhci_port_state_to_neutral(u32 state);
int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
u16 port);
void xhci_ring_device(struct xhci_hcd *xhci, int slot_id);
+int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend);
/* xHCI contexts */
struct xhci_input_control_ctx *xhci_get_input_control_ctx(struct xhci_container_ctx *ctx);
struct xhci_slot_ctx *xhci_get_slot_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx);
struct xhci_ep_ctx *xhci_get_ep_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx, unsigned int ep_index);
+void xhci_notify(struct usb_hcd *hcd, struct usb_device *udev,
+ enum hcd_notification_type type, void *data);
#endif /* __LINUX_XHCI_HCD_H */
--
2.1.0
--
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