usb: gadget: Add support for Suspend/Resume power collapse
This commit adds support for handshake with the IPA-A2 when
the host suspends/resumes the USB bus. The driver will delay
the USB core to go into LPM until after the handshake is complete.
Upon resume the driver will initiate the handshake again. This
also includes the case for remote wakeup in which A2 receives
data from the WAN and wakes USB up by starting the handshake.
Change-Id: I0f9b08e093fa248b7dcde346d970bd2c20d133f3
Signed-off-by: Lena Salman <esalman@codeaurora.org>
diff --git a/drivers/usb/gadget/u_bam.c b/drivers/usb/gadget/u_bam.c
index c05f683..b71f903 100644
--- a/drivers/usb/gadget/u_bam.c
+++ b/drivers/usb/gadget/u_bam.c
@@ -539,9 +539,12 @@
struct bam_ch_info *d = &port->data_ch;
int status;
- if (!port->port_usb)
+ if (!port->port_usb) {
+ pr_err("%s: port->port_usb is NULL", __func__);
return;
+ }
+ pr_debug("%s: enqueue\n", __func__);
status = usb_ep_queue(port->port_usb->out, d->rx_req, GFP_ATOMIC);
if (status)
pr_err("%s: error enqueuing transfer, %d\n", __func__, status);
@@ -552,14 +555,69 @@
struct bam_ch_info *d = &port->data_ch;
int status;
- if (!port->port_usb)
+ if (!port->port_usb) {
+ pr_err("%s: port->port_usb is NULL", __func__);
return;
+ }
+ pr_debug("%s: enqueue\n", __func__);
status = usb_ep_queue(port->port_usb->in, d->tx_req, GFP_ATOMIC);
if (status)
pr_err("%s: error enqueuing transfer, %d\n", __func__, status);
}
+static void gbam_stop_endless_rx(struct gbam_port *port)
+{
+ struct bam_ch_info *d = &port->data_ch;
+ int status;
+
+ if (!port->port_usb) {
+ pr_err("%s: port->port_usb is NULL", __func__);
+ return;
+ }
+ pr_debug("%s: dequeue\n", __func__);
+
+ status = usb_ep_dequeue(port->port_usb->out, d->rx_req);
+ if (status)
+ pr_err("%s: error dequeuing transfer, %d\n", __func__, status);
+
+}
+static void gbam_stop_endless_tx(struct gbam_port *port)
+{
+ struct bam_ch_info *d = &port->data_ch;
+ int status;
+
+ if (!port->port_usb) {
+ pr_err("%s: port->port_usb is NULL", __func__);
+ return;
+ }
+
+ pr_debug("%s: dequeue\n", __func__);
+ status = usb_ep_dequeue(port->port_usb->in, d->tx_req);
+ if (status)
+ pr_err("%s: error dequeuing transfer, %d\n", __func__, status);
+}
+
+static void gbam_start(void *param, enum usb_bam_pipe_dir dir)
+{
+ struct gbam_port *port = param;
+
+ if (dir == USB_TO_PEER_PERIPHERAL)
+ gbam_start_endless_rx(port);
+ else
+ gbam_start_endless_tx(port);
+}
+
+static void gbam_stop(void *param, enum usb_bam_pipe_dir dir)
+{
+ struct gbam_port *port = param;
+
+ if (dir == USB_TO_PEER_PERIPHERAL)
+ gbam_stop_endless_rx(port);
+ else
+ gbam_stop_endless_tx(port);
+}
+
static void gbam_start_io(struct gbam_port *port)
{
unsigned long flags;
@@ -1409,6 +1467,10 @@
pr_debug("%s: suspended port %d\n", __func__, port_num);
usb_bam_register_wake_cb(d->dst_connection_idx, gbam_wake_cb, port);
+ if (trans == USB_GADGET_XPORT_BAM2BAM_IPA) {
+ usb_bam_register_start_stop_cbs(gbam_start, gbam_stop, port);
+ usb_bam_suspend(&d->ipa_params);
+ }
}
void gbam_resume(struct grmnet *gr, u8 port_num, enum transport_type trans)
@@ -1426,4 +1488,6 @@
pr_debug("%s: resumed port %d\n", __func__, port_num);
usb_bam_register_wake_cb(d->dst_connection_idx, NULL, NULL);
+ if (trans == USB_GADGET_XPORT_BAM2BAM_IPA)
+ usb_bam_resume(&d->ipa_params);
}