[PATCH 3/5] xhci: prepare for operation w/o shared hcd
Heiner Kallweit
hkallweit1 at gmail.com
Fri Mar 4 10:35:39 PST 2022
This patch prepares xhci for the following scenario:
- If either of the root hubs has no ports, then omit shared hcd
- Main hcd can be USB3 if there are no USB2 ports
Signed-off-by: Heiner Kallweit <hkallweit1 at gmail.com>
---
drivers/usb/host/xhci-hub.c | 3 ++-
drivers/usb/host/xhci-mem.c | 4 +++-
drivers/usb/host/xhci.c | 44 +++++++++++++++++++++++--------------
drivers/usb/host/xhci.h | 20 +++++++++++++++++
4 files changed, 53 insertions(+), 18 deletions(-)
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index df3522dab..7931c7612 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -707,6 +707,7 @@ static int xhci_enter_test_mode(struct xhci_hcd *xhci,
u16 test_mode, u16 wIndex, unsigned long *flags)
__must_hold(&xhci->lock)
{
+ struct usb_hcd *usb3_hcd = xhci_get_usb3_hcd(xhci);
int i, retval;
/* Disable all Device Slots */
@@ -727,7 +728,7 @@ static int xhci_enter_test_mode(struct xhci_hcd *xhci,
xhci_dbg(xhci, "Disable all port (PP = 0)\n");
/* Power off USB3 ports*/
for (i = 0; i < xhci->usb3_rhub.num_ports; i++)
- xhci_set_port_power(xhci, xhci->shared_hcd, i, false, flags);
+ xhci_set_port_power(xhci, usb3_hcd, i, false, flags);
/* Power off USB2 ports*/
for (i = 0; i < xhci->usb2_rhub.num_ports; i++)
xhci_set_port_power(xhci, xhci->main_hcd, i, false, flags);
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index f8c2b6c79..a1a17713a 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1072,7 +1072,7 @@ static u32 xhci_find_real_port_number(struct xhci_hcd *xhci,
struct usb_hcd *hcd;
if (udev->speed >= USB_SPEED_SUPER)
- hcd = xhci->shared_hcd;
+ hcd = xhci_get_usb3_hcd(xhci);
else
hcd = xhci->main_hcd;
@@ -2362,6 +2362,8 @@ static int xhci_setup_port_arrays(struct xhci_hcd *xhci, gfp_t flags)
xhci->usb2_rhub.num_ports = USB_MAXCHILDREN;
}
+ xhci->needs_shared_hcd = 1;
+
/*
* Note we could have all USB 3.0 ports, or all USB 2.0 ports.
* Not sure how the USB core will handle a hub with no ports...
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 824b833ae..83a54a566 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -485,6 +485,10 @@ static void compliance_mode_recovery(struct timer_list *t)
xhci = from_timer(xhci, t, comp_mode_recovery_timer);
rhub = &xhci->usb3_rhub;
+ hcd = rhub->hcd;
+
+ if (!hcd)
+ return;
for (i = 0; i < rhub->num_ports; i++) {
temp = readl(rhub->ports[i]->addr);
@@ -498,7 +502,6 @@ static void compliance_mode_recovery(struct timer_list *t)
i + 1);
xhci_dbg_trace(xhci, trace_xhci_dbg_quirks,
"Attempting compliance mode recovery");
- hcd = xhci->shared_hcd;
if (hcd->state == HC_STATE_SUSPENDED)
usb_hcd_resume_root_hub(hcd);
@@ -611,14 +614,11 @@ static int xhci_run_finished(struct xhci_hcd *xhci)
xhci_halt(xhci);
return -ENODEV;
}
- xhci->shared_hcd->state = HC_STATE_RUNNING;
xhci->cmd_ring_state = CMD_RING_STATE_RUNNING;
if (xhci->quirks & XHCI_NEC_HOST)
xhci_ring_cmd_db(xhci);
- xhci_dbg_trace(xhci, trace_xhci_dbg_init,
- "Finished xhci_run for USB3 roothub");
return 0;
}
@@ -693,12 +693,15 @@ int xhci_run(struct usb_hcd *hcd)
xhci_free_command(xhci, command);
}
xhci_dbg_trace(xhci, trace_xhci_dbg_init,
- "Finished xhci_run for USB2 roothub");
+ "Finished %s for main hcd", __func__);
xhci_create_dbc_dev(xhci);
xhci_debugfs_init(xhci);
+ if (!xhci->needs_shared_hcd)
+ return xhci_run_finished(xhci);
+
return 0;
}
EXPORT_SYMBOL_GPL(xhci_run);
@@ -980,7 +983,7 @@ int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup)
return 0;
if (hcd->state != HC_STATE_SUSPENDED ||
- xhci->shared_hcd->state != HC_STATE_SUSPENDED)
+ (xhci->shared_hcd && xhci->shared_hcd->state != HC_STATE_SUSPENDED))
return -EINVAL;
/* Clear root port wake on bits if wakeup not allowed. */
@@ -997,15 +1000,18 @@ int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup)
__func__, hcd->self.busnum);
clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
del_timer_sync(&hcd->rh_timer);
- clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
- del_timer_sync(&xhci->shared_hcd->rh_timer);
+ if (xhci->shared_hcd) {
+ clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
+ del_timer_sync(&xhci->shared_hcd->rh_timer);
+ }
if (xhci->quirks & XHCI_SUSPEND_DELAY)
usleep_range(1000, 1500);
spin_lock_irq(&xhci->lock);
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
- clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
+ if (xhci->shared_hcd)
+ clear_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
/* step 1: stop endpoint */
/* skipped assuming that port suspend has done */
@@ -1105,7 +1111,8 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
msleep(100);
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
- set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
+ if (xhci->shared_hcd)
+ set_bit(HCD_FLAG_HW_ACCESSIBLE, &xhci->shared_hcd->flags);
spin_lock_irq(&xhci->lock);
@@ -1165,7 +1172,8 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
/* Let the USB core know _both_ roothubs lost power. */
usb_root_hub_lost_power(xhci->main_hcd->self.root_hub);
- usb_root_hub_lost_power(xhci->shared_hcd->self.root_hub);
+ if (xhci->shared_hcd)
+ usb_root_hub_lost_power(xhci->shared_hcd->self.root_hub);
xhci_dbg(xhci, "Stop HCD\n");
xhci_halt(xhci);
@@ -1205,12 +1213,13 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
xhci_dbg(xhci, "Start the primary HCD\n");
retval = xhci_run(hcd->primary_hcd);
- if (!retval) {
+ if (!retval && secondary_hcd) {
xhci_dbg(xhci, "Start the secondary HCD\n");
retval = xhci_run(secondary_hcd);
}
hcd->state = HC_STATE_SUSPENDED;
- xhci->shared_hcd->state = HC_STATE_SUSPENDED;
+ if (xhci->shared_hcd)
+ xhci->shared_hcd->state = HC_STATE_SUSPENDED;
goto done;
}
@@ -1248,7 +1257,8 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
}
if (pending_portevent) {
- usb_hcd_resume_root_hub(xhci->shared_hcd);
+ if (xhci->shared_hcd)
+ usb_hcd_resume_root_hub(xhci->shared_hcd);
usb_hcd_resume_root_hub(hcd);
}
}
@@ -1267,8 +1277,10 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
/* Re-enable port polling. */
xhci_dbg(xhci, "%s: starting usb%d port polling.\n",
__func__, hcd->self.busnum);
- set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
- usb_hcd_poll_rh_status(xhci->shared_hcd);
+ if (xhci->shared_hcd) {
+ set_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags);
+ usb_hcd_poll_rh_status(xhci->shared_hcd);
+ }
set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
usb_hcd_poll_rh_status(hcd);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 8a0026ee9..2edc910d9 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1908,6 +1908,8 @@ struct xhci_hcd {
unsigned hw_lpm_support:1;
/* Broken Suspend flag for SNPS Suspend resume issue */
unsigned broken_suspend:1;
+ /* Indicates that a shared hcd is needed */
+ unsigned needs_shared_hcd:1;
/* cached usb2 extened protocol capabilites */
u32 *ext_caps;
unsigned int num_ext_caps;
@@ -1963,6 +1965,24 @@ static inline struct usb_hcd *xhci_to_hcd(struct xhci_hcd *xhci)
return xhci->main_hcd;
}
+static inline struct usb_hcd *xhci_get_usb3_hcd(struct xhci_hcd *xhci)
+{
+ if (xhci->shared_hcd)
+ return xhci->shared_hcd;
+
+ if (!xhci->usb2_rhub.num_ports)
+ return xhci->main_hcd;
+
+ return NULL;
+}
+
+static inline bool xhci_hcd_is_usb3(struct usb_hcd *hcd)
+{
+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+ return hcd == xhci_get_usb3_hcd(xhci);
+}
+
#define xhci_dbg(xhci, fmt, args...) \
dev_dbg(xhci_to_hcd(xhci)->self.controller , fmt , ## args)
#define xhci_err(xhci, fmt, args...) \
--
2.35.1
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