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usb: cdns3: add power lost support for system resume

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If the controller lost its power during the system suspend, we need
to do all initialiation operations.

Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Frank Li <frank.li@nxp.com>
Signed-off-by: Peter Chen <peter.chen@kernel.org>
This commit is contained in:
Frank Li 2021-02-18 16:51:08 -06:00 • committed by Peter Chen
parent 14d34d2dbb
commit 2cf2581cd2
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GPG key ID: 4859298150D671BB
5 changed files with 68 additions and 3 deletions
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29
drivers/usb/cdns3/core.c
View file

@ -525,9 +525,36 @@ EXPORT_SYMBOL_GPL(cdns_suspend);
int cdns_resume(struct cdns *cdns, u8 set_active)
{
struct device *dev = cdns->dev;
enum usb_role real_role;
bool role_changed = false;
int ret;
if (cdns_power_is_lost(cdns)) {
if (cdns->role_sw) {
cdns->role = cdns_role_get(cdns->role_sw);
} else {
real_role = cdns_hw_role_state_machine(cdns);
if (real_role != cdns->role) {
ret = cdns_hw_role_switch(cdns);
if (ret)
return ret;
role_changed = true;
}
}
if (!role_changed) {
if (cdns->role == USB_ROLE_HOST)
ret = cdns_drd_host_on(cdns);
else if (cdns->role == USB_ROLE_DEVICE)
ret = cdns_drd_gadget_on(cdns);
if (ret)
return ret;
}
}
if (cdns->roles[cdns->role]->resume)
cdns->roles[cdns->role]->resume(cdns, false);
cdns->roles[cdns->role]->resume(cdns, cdns_power_is_lost(cdns));
if (set_active) {
pm_runtime_disable(dev);