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usb: gsi: Retry USB function wakeup if USB is into low power mode

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Consider case where USB is into low power mode after receiving USB
function suspend from host. To invoke function remote wakeup USB
controller is rerquired to bring out of low power mode. Hence once
USB controller and USB bus is resumed, perform USB function wakeup
from composite_resume() context to resume USB function on host side.

Change-Id: Id5103f0e7bf3d324cd6c206d1d6214f6d6c107a4
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
This commit is contained in:
Mayank Rana 2021-01-28 15:41:15 -08:00
commit 718f2b7a95
2 changed files with 15 additions and 4 deletions
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18
drivers/usb/gadget/function/f_gsi.c
View file

@ -163,6 +163,8 @@ static int gsi_wakeup_host(struct f_gsi *gsi)
if ((gadget->speed >= USB_SPEED_SUPER) && (gsi->func_is_suspended)) {
log_event_dbg("%s: Calling usb_func_wakeup", __func__);
ret = usb_func_wakeup(func);
if (ret == -EAGAIN)
gsi->func_wakeup_pending = true;
} else {
log_event_dbg("%s: Calling usb_gadget_wakeup", __func__);
ret = usb_gadget_wakeup(gadget);
@ -1905,9 +1907,11 @@ static int queue_notification_request(struct f_gsi *gsi)
log_event_dbg("%s wakeup host\n", __func__);
if (gadget->speed >= USB_SPEED_SUPER
&& gsi->func_is_suspended)
&& gsi->func_is_suspended) {
ret = usb_func_wakeup(func);
else
if (ret == -EAGAIN)
gsi->func_wakeup_pending = true;
} else
ret = usb_gadget_wakeup(gadget);
gsi->rwake_inprogress = true;
@ -2548,6 +2552,7 @@ static int gsi_set_alt(struct usb_function *f, unsigned int intf,
}
gsi->c_port.is_suspended = false;
gsi->func_wakeup_pending = false;
atomic_set(&gsi->connected, 1);
/* send 0 len pkt to qti to notify state change */
@ -2662,8 +2667,13 @@ static void gsi_resume(struct usb_function *f)
* canceled. In this case resume is done by a Function Resume request.
*/
if ((cdev->gadget->speed >= USB_SPEED_SUPER) &&
gsi->func_is_suspended)
gsi->func_is_suspended) {
if (gsi->func_wakeup_pending) {
usb_func_wakeup(&gsi->function);
gsi->func_wakeup_pending = false;
}
return;
}
/* Keep timer enabled if user enabled using debugfs */
if (!gsi->debugfs_rw_timer_enable)
@ -3332,7 +3342,7 @@ static void gsi_unbind(struct usb_configuration *c, struct usb_function *f)
rmnet_gsi_string_defs[0].id = 0;
mbim_gsi_string_defs[0].id = 0;
qdss_gsi_string_defs[0].id = 0;
gsi->func_wakeup_pending = false;
if (gsi->prot_id == IPA_USB_RNDIS) {
gsi->d_port.sm_state = STATE_UNINITIALIZED;
rndis_deregister(gsi->params);

1
drivers/usb/gadget/function/f_gsi.h
View file

@ -275,6 +275,7 @@ struct f_gsi {
/* function suspend status */
bool func_is_suspended;
bool func_wakeup_allowed;
bool func_wakeup_pending;
const struct usb_endpoint_descriptor *in_ep_desc_backup;
const struct usb_endpoint_descriptor *out_ep_desc_backup;