diff options
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 2 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-pci.c | 4 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-sched.c | 69 | ||||
| -rw-r--r-- | drivers/usb/host/ehci-timer.c | 80 | ||||
| -rw-r--r-- | drivers/usb/host/ehci.h | 7 |
5 files changed, 101 insertions, 61 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index f8fed16..7e00ca0 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 21e5f96..2cb7d37 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 3429b8a3..f5c1588 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 f6279e2..ecd3296 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 070be83..da2e0ab 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*/ |