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-rw-r--r--drivers/usb/host/ehci-hcd.c2
-rw-r--r--drivers/usb/host/ehci-pci.c4
-rw-r--r--drivers/usb/host/ehci-sched.c69
-rw-r--r--drivers/usb/host/ehci-timer.c80
-rw-r--r--drivers/usb/host/ehci.h7
5 files changed, 101 insertions, 61 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index f8fed163a23a..7e00ca095cea 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -546,7 +546,7 @@ static void ehci_work (struct ehci_hcd *ehci)
*/
if (ehci->rh_state == EHCI_RH_RUNNING &&
(ehci->async->qh_next.ptr != NULL ||
- ehci->periodic_sched != 0))
+ ehci->periodic_count != 0))
timer_action (ehci, TIMER_IO_WATCHDOG);
}
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 21e5f963f331..2cb7d370c4ef 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -104,10 +104,6 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
break;
case PCI_VENDOR_ID_INTEL:
ehci->fs_i_thresh = 1;
- if (pdev->device == 0x27cc) {
- ehci->broken_periodic = 1;
- ehci_info(ehci, "using broken periodic workaround\n");
- }
if (pdev->device == PCI_DEVICE_ID_INTEL_CE4100_USB)
hcd->has_tt = 1;
break;
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 3429b8a33c58..f5c15880c65a 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -481,67 +481,26 @@ static int tt_no_collision (
static int enable_periodic (struct ehci_hcd *ehci)
{
- int status;
-
- if (ehci->periodic_sched++)
+ if (ehci->periodic_count++)
return 0;
- /* did clearing PSE did take effect yet?
- * takes effect only at frame boundaries...
- */
- status = handshake_on_error_set_halt(ehci, &ehci->regs->status,
- STS_PSS, 0, 9 * 125);
- if (status) {
- usb_hc_died(ehci_to_hcd(ehci));
- return status;
- }
-
- ehci->command |= CMD_PSE;
- ehci_writel(ehci, ehci->command, &ehci->regs->command);
- /* posted write ... PSS happens later */
+ /* Stop waiting to turn off the periodic schedule */
+ ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_DISABLE_PERIODIC);
- /* make sure ehci_work scans these */
- ehci->next_uframe = ehci_read_frame_index(ehci)
- % (ehci->periodic_size << 3);
- if (unlikely(ehci->broken_periodic))
- ehci->last_periodic_enable = ktime_get_real();
+ /* Don't start the schedule until PSS is 0 */
+ ehci_poll_PSS(ehci);
return 0;
}
static int disable_periodic (struct ehci_hcd *ehci)
{
- int status;
-
- if (--ehci->periodic_sched)
+ if (--ehci->periodic_count)
return 0;
- if (unlikely(ehci->broken_periodic)) {
- /* delay experimentally determined */
- ktime_t safe = ktime_add_us(ehci->last_periodic_enable, 1000);
- ktime_t now = ktime_get_real();
- s64 delay = ktime_us_delta(safe, now);
-
- if (unlikely(delay > 0))
- udelay(delay);
- }
-
- /* did setting PSE not take effect yet?
- * takes effect only at frame boundaries...
- */
- status = handshake_on_error_set_halt(ehci, &ehci->regs->status,
- STS_PSS, STS_PSS, 9 * 125);
- if (status) {
- usb_hc_died(ehci_to_hcd(ehci));
- return status;
- }
-
- ehci->command &= ~CMD_PSE;
- ehci_writel(ehci, ehci->command, &ehci->regs->command);
- /* posted write ... */
-
- free_cached_lists(ehci);
+ ehci->next_uframe = -1; /* the periodic schedule is empty */
- ehci->next_uframe = -1;
+ /* Don't turn off the schedule until PSS is 1 */
+ ehci_poll_PSS(ehci);
return 0;
}
@@ -650,8 +609,7 @@ static int qh_unlink_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
qh->qh_state = QH_STATE_UNLINK;
qh->qh_next.ptr = NULL;
- /* maybe turn off periodic schedule */
- return disable_periodic(ehci);
+ return 0;
}
static void intr_deschedule (struct ehci_hcd *ehci, struct ehci_qh *qh)
@@ -706,6 +664,9 @@ static void intr_deschedule (struct ehci_hcd *ehci, struct ehci_qh *qh)
ehci_err(ehci, "can't reschedule qh %p, err %d\n",
qh, rc);
}
+
+ /* maybe turn off periodic schedule */
+ disable_periodic(ehci);
}
/*-------------------------------------------------------------------------*/
@@ -2447,7 +2408,7 @@ restart:
/* assume completion callbacks modify the queue */
if (unlikely (modified)) {
- if (likely(ehci->periodic_sched > 0))
+ if (likely(ehci->periodic_count > 0))
goto restart;
/* short-circuit this scan */
now_uframe = clock;
@@ -2476,7 +2437,7 @@ restart:
unsigned now;
if (ehci->rh_state < EHCI_RH_RUNNING
- || ehci->periodic_sched == 0)
+ || ehci->periodic_count == 0)
break;
ehci->next_uframe = now_uframe;
now = ehci_read_frame_index(ehci) & (mod - 1);
diff --git a/drivers/usb/host/ehci-timer.c b/drivers/usb/host/ehci-timer.c
index f6279e2883a8..ecd3296157c6 100644
--- a/drivers/usb/host/ehci-timer.c
+++ b/drivers/usb/host/ehci-timer.c
@@ -16,6 +16,28 @@
/*-------------------------------------------------------------------------*/
+/* Set a bit in the USBCMD register */
+static void ehci_set_command_bit(struct ehci_hcd *ehci, u32 bit)
+{
+ ehci->command |= bit;
+ ehci_writel(ehci, ehci->command, &ehci->regs->command);
+
+ /* unblock posted write */
+ ehci_readl(ehci, &ehci->regs->command);
+}
+
+/* Clear a bit in the USBCMD register */
+static void ehci_clear_command_bit(struct ehci_hcd *ehci, u32 bit)
+{
+ ehci->command &= ~bit;
+ ehci_writel(ehci, ehci->command, &ehci->regs->command);
+
+ /* unblock posted write */
+ ehci_readl(ehci, &ehci->regs->command);
+}
+
+/*-------------------------------------------------------------------------*/
+
/*
* EHCI timer support... Now using hrtimers.
*
@@ -45,6 +67,8 @@
* the event types indexed by enum ehci_hrtimer_event in ehci.h.
*/
static unsigned event_delays_ns[] = {
+ 1 * NSEC_PER_MSEC, /* EHCI_HRTIMER_POLL_PSS */
+ 10 * NSEC_PER_MSEC, /* EHCI_HRTIMER_DISABLE_PERIODIC */
};
/* Enable a pending hrtimer event */
@@ -67,12 +91,68 @@ static void ehci_enable_event(struct ehci_hcd *ehci, unsigned event,
}
+/* Poll the STS_PSS status bit; see when it agrees with CMD_PSE */
+static void ehci_poll_PSS(struct ehci_hcd *ehci)
+{
+ unsigned actual, want;
+
+ /* Don't do anything if the controller isn't running (e.g., died) */
+ if (ehci->rh_state != EHCI_RH_RUNNING)
+ return;
+
+ want = (ehci->command & CMD_PSE) ? STS_PSS : 0;
+ actual = ehci_readl(ehci, &ehci->regs->status) & STS_PSS;
+
+ if (want != actual) {
+
+ /* Poll again later, but give up after about 20 ms */
+ if (ehci->PSS_poll_count++ < 20) {
+ ehci_enable_event(ehci, EHCI_HRTIMER_POLL_PSS, true);
+ return;
+ }
+ ehci_warn(ehci, "Waited too long for the periodic schedule status, giving up\n");
+ }
+ ehci->PSS_poll_count = 0;
+
+ /* The status is up-to-date; restart or stop the schedule as needed */
+ if (want == 0) { /* Stopped */
+ free_cached_lists(ehci);
+ if (ehci->periodic_count > 0) {
+
+ /* make sure ehci_work scans these */
+ ehci->next_uframe = ehci_read_frame_index(ehci)
+ & ((ehci->periodic_size << 3) - 1);
+ ehci_set_command_bit(ehci, CMD_PSE);
+ }
+
+ } else { /* Running */
+ if (ehci->periodic_count == 0) {
+
+ /* Turn off the schedule after a while */
+ ehci_enable_event(ehci, EHCI_HRTIMER_DISABLE_PERIODIC,
+ true);
+ }
+ }
+}
+
+/* Turn off the periodic schedule after a brief delay */
+static void ehci_disable_PSE(struct ehci_hcd *ehci)
+{
+ ehci_clear_command_bit(ehci, CMD_PSE);
+
+ /* Poll to see when it actually stops */
+ ehci_enable_event(ehci, EHCI_HRTIMER_POLL_PSS, true);
+}
+
+
/*
* Handler functions for the hrtimer event types.
* Keep this array in the same order as the event types indexed by
* enum ehci_hrtimer_event in ehci.h.
*/
static void (*event_handlers[])(struct ehci_hcd *) = {
+ ehci_poll_PSS, /* EHCI_HRTIMER_POLL_PSS */
+ ehci_disable_PSE, /* EHCI_HRTIMER_DISABLE_PERIODIC */
};
static enum hrtimer_restart ehci_hrtimer_func(struct hrtimer *t)
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 070be83028d5..da2e0ab23850 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -79,6 +79,8 @@ enum ehci_rh_state {
* ehci-timer.c) in parallel with this list.
*/
enum ehci_hrtimer_event {
+ EHCI_HRTIMER_POLL_PSS, /* Poll for periodic schedule off */
+ EHCI_HRTIMER_DISABLE_PERIODIC, /* Wait to disable periodic sched */
EHCI_HRTIMER_NUM_EVENTS /* Must come last */
};
#define EHCI_HRTIMER_NO_EVENT 99
@@ -90,6 +92,8 @@ struct ehci_hcd { /* one per controller */
ktime_t hr_timeouts[EHCI_HRTIMER_NUM_EVENTS];
struct hrtimer hrtimer;
+ int PSS_poll_count;
+
/* glue to PCI and HCD framework */
struct ehci_caps __iomem *caps;
struct ehci_regs __iomem *regs;
@@ -116,7 +120,7 @@ struct ehci_hcd { /* one per controller */
union ehci_shadow *pshadow; /* mirror hw periodic table */
int next_uframe; /* scan periodic, start here */
- unsigned periodic_sched; /* periodic activity count */
+ unsigned periodic_count; /* periodic activity count */
unsigned uframe_periodic_max; /* max periodic time per uframe */
@@ -165,7 +169,6 @@ struct ehci_hcd { /* one per controller */
unsigned big_endian_capbase:1;
unsigned has_amcc_usb23:1;
unsigned need_io_watchdog:1;
- unsigned broken_periodic:1;
unsigned amd_pll_fix:1;
unsigned fs_i_thresh:1; /* Intel iso scheduling */
unsigned use_dummy_qh:1; /* AMD Frame List table quirk*/
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-22 08:44:25 +0000