github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-29 02:31:27 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

xhci: dbc: add timestamps to DbC state changes in a new helper.

Browse Source 
The timestamp helps us track when a state changed the last time.
It allows us to detect if DbC is stuck in connected state for too long,
and can later be used to enable runtime suspend if there is no activity
for some time

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://patch.msgid.link/20260603091132.1110849-11-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2026-06-03 12:11:27 +03:00 committed by Greg Kroah-Hartman
parent de58a7d374
commit 724eab31dd
2 changed files with 13 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/usb/host/xhci-dbgcap.c
View File

@ -644,6 +644,12 @@ static int xhci_dbc_enable_dce(struct xhci_dbc *dbc, bool enable)
done_state, 1000);
}
static void xhci_dbc_set_state(struct xhci_dbc *dbc, enum dbc_state new_state)
{
dbc->state_timestamp = jiffies;
dbc->state = new_state;
}
static int xhci_do_dbc_start(struct xhci_dbc *dbc)
{
int ret;
@ -663,7 +669,7 @@ static int xhci_do_dbc_start(struct xhci_dbc *dbc)
if (ret)
return ret;
dbc->state = DS_ENABLED;
xhci_dbc_set_state(dbc, DS_ENABLED);
return 0;
}
@ -725,7 +731,7 @@ static void xhci_dbc_stop(struct xhci_dbc *dbc)
spin_lock_irqsave(&dbc->lock, flags);
writel(0, &dbc->regs->control);
dbc->state = DS_DISABLED;
xhci_dbc_set_state(dbc, DS_DISABLED);
spin_unlock_irqrestore(&dbc->lock, flags);
xhci_dbc_mem_cleanup(dbc);
@ -896,7 +902,7 @@ static enum evtreturn xhci_dbc_do_handle_events(struct xhci_dbc *dbc)
case DS_ENABLED:
portsc = readl(&dbc->regs->portsc);
if (portsc & DBC_PORTSC_CONN_STATUS) {
dbc->state = DS_CONNECTED;
xhci_dbc_set_state(dbc, DS_CONNECTED);
dev_info(dbc->dev, "DbC connected\n");
}
@ -904,7 +910,7 @@ static enum evtreturn xhci_dbc_do_handle_events(struct xhci_dbc *dbc)
case DS_CONNECTED:
ctrl = readl(&dbc->regs->control);
if (ctrl & DBC_CTRL_DBC_RUN) {
dbc->state = DS_CONFIGURED;
xhci_dbc_set_state(dbc, DS_CONFIGURED);
dev_info(dbc->dev, "DbC configured\n");
portsc = readl(&dbc->regs->portsc);
writel(portsc, &dbc->regs->portsc);
@ -919,7 +925,7 @@ static enum evtreturn xhci_dbc_do_handle_events(struct xhci_dbc *dbc)
if (!(portsc & DBC_PORTSC_PORT_ENABLED) &&
!(portsc & DBC_PORTSC_CONN_STATUS)) {
dev_info(dbc->dev, "DbC cable unplugged\n");
dbc->state = DS_ENABLED;
xhci_dbc_set_state(dbc, DS_ENABLED);
xhci_dbc_flush_requests(dbc);
xhci_dbc_reinit_ep_rings(dbc);
return EVT_DISC;
@ -929,7 +935,7 @@ static enum evtreturn xhci_dbc_do_handle_events(struct xhci_dbc *dbc)
if (portsc & DBC_PORTSC_RESET_CHANGE) {
dev_info(dbc->dev, "DbC port reset\n");
writel(portsc, &dbc->regs->portsc);
dbc->state = DS_ENABLED;
xhci_dbc_set_state(dbc, DS_ENABLED);
xhci_dbc_flush_requests(dbc);
xhci_dbc_reinit_ep_rings(dbc);
return EVT_DISC;

1
drivers/usb/host/xhci-dbgcap.h
View File

@ -163,6 +163,7 @@ struct xhci_dbc {
struct delayed_work event_work;
unsigned int poll_interval; /* ms */
unsigned long xfer_timestamp;
unsigned long state_timestamp;
unsigned resume_required:1;
struct dbc_ep eps[2];