[PATCH] USB UHCI: remove the FSBR kernel timer
This patch (as558) removes from the UHCI driver a kernel timer used for checking Full Speed Bandwidth Reclamation (FSBR). The checking can be done during normal root-hub polling; it doesn't need a separate timer. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>hifive-unleashed-5.1
Alan Stern
Greg Kroah-Hartman
parent
f1a15606d5
commit
1f09df8bfe
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@ -97,14 +97,9 @@ static void uhci_get_current_frame_number(struct uhci_hcd *uhci);
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/* to make sure it doesn't hog all of the bandwidth */
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#define DEPTH_INTERVAL 5
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static inline void restart_timer(struct uhci_hcd *uhci)
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{
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mod_timer(&uhci->stall_timer, jiffies + msecs_to_jiffies(100));
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}
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#include "uhci-hub.c"
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#include "uhci-debug.c"
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#include "uhci-q.c"
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#include "uhci-hub.c"
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/*
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* Make sure the controller is completely inactive, unable to
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@ -160,7 +155,6 @@ static void hc_died(struct uhci_hcd *uhci)
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{
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reset_hc(uhci);
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uhci->hc_inaccessible = 1;
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del_timer(&uhci->stall_timer);
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}
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/*
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@ -287,8 +281,11 @@ __acquires(uhci->lock)
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/* Enable resume-detect interrupts if they work.
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* Then enter Global Suspend mode, still configured.
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*/
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int_enable = (resume_detect_interrupts_are_broken(uhci) ?
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0 : USBINTR_RESUME);
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uhci->working_RD = 1;
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int_enable = USBINTR_RESUME;
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if (resume_detect_interrupts_are_broken(uhci)) {
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uhci->working_RD = int_enable = 0;
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}
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outw(int_enable, uhci->io_addr + USBINTR);
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outw(USBCMD_EGSM | USBCMD_CF, uhci->io_addr + USBCMD);
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mb();
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@ -315,7 +312,6 @@ __acquires(uhci->lock)
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uhci->rh_state = new_state;
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uhci->is_stopped = UHCI_IS_STOPPED;
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del_timer(&uhci->stall_timer);
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uhci_to_hcd(uhci)->poll_rh = !int_enable;
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uhci_scan_schedule(uhci, NULL);
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@ -335,7 +331,6 @@ static void start_rh(struct uhci_hcd *uhci)
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mb();
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uhci->rh_state = UHCI_RH_RUNNING;
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uhci_to_hcd(uhci)->poll_rh = 1;
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restart_timer(uhci);
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}
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static void wakeup_rh(struct uhci_hcd *uhci)
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@ -374,20 +369,6 @@ __acquires(uhci->lock)
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mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
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}
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static void stall_callback(unsigned long _uhci)
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{
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struct uhci_hcd *uhci = (struct uhci_hcd *) _uhci;
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unsigned long flags;
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spin_lock_irqsave(&uhci->lock, flags);
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uhci_scan_schedule(uhci, NULL);
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check_fsbr(uhci);
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if (!uhci->is_stopped)
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restart_timer(uhci);
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spin_unlock_irqrestore(&uhci->lock, flags);
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}
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static irqreturn_t uhci_irq(struct usb_hcd *hcd, struct pt_regs *regs)
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{
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struct uhci_hcd *uhci = hcd_to_uhci(hcd);
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@ -418,8 +399,10 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd, struct pt_regs *regs)
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"host controller halted, "
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"very bad!\n");
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hc_died(uhci);
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spin_unlock_irqrestore(&uhci->lock, flags);
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return IRQ_HANDLED;
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/* Force a callback in case there are
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* pending unlinks */
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mod_timer(&hcd->rh_timer, jiffies);
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}
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spin_unlock_irqrestore(&uhci->lock, flags);
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}
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@ -427,10 +410,11 @@ static irqreturn_t uhci_irq(struct usb_hcd *hcd, struct pt_regs *regs)
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if (status & USBSTS_RD)
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usb_hcd_poll_rh_status(hcd);
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spin_lock_irqsave(&uhci->lock, flags);
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uhci_scan_schedule(uhci, regs);
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spin_unlock_irqrestore(&uhci->lock, flags);
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else {
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spin_lock_irqsave(&uhci->lock, flags);
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uhci_scan_schedule(uhci, regs);
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spin_unlock_irqrestore(&uhci->lock, flags);
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}
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return IRQ_HANDLED;
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}
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@ -595,10 +579,6 @@ static int uhci_start(struct usb_hcd *hcd)
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init_waitqueue_head(&uhci->waitqh);
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init_timer(&uhci->stall_timer);
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uhci->stall_timer.function = stall_callback;
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uhci->stall_timer.data = (unsigned long) uhci;
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uhci->fl = dma_alloc_coherent(uhci_dev(uhci), sizeof(*uhci->fl),
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&dma_handle, 0);
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if (!uhci->fl) {
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@ -745,11 +725,11 @@ static void uhci_stop(struct usb_hcd *hcd)
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struct uhci_hcd *uhci = hcd_to_uhci(hcd);
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spin_lock_irq(&uhci->lock);
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reset_hc(uhci);
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if (!uhci->hc_inaccessible)
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reset_hc(uhci);
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uhci_scan_schedule(uhci, NULL);
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spin_unlock_irq(&uhci->lock);
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del_timer_sync(&uhci->stall_timer);
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release_uhci(uhci);
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}
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@ -811,13 +791,12 @@ static int uhci_suspend(struct usb_hcd *hcd, pm_message_t message)
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*/
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pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0);
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uhci->hc_inaccessible = 1;
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hcd->poll_rh = 0;
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/* FIXME: Enable non-PME# remote wakeup? */
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done:
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spin_unlock_irq(&uhci->lock);
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if (rc == 0)
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del_timer_sync(&hcd->rh_timer);
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return rc;
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}
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@ -850,8 +829,11 @@ static int uhci_resume(struct usb_hcd *hcd)
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spin_unlock_irq(&uhci->lock);
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if (hcd->poll_rh)
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if (!uhci->working_RD) {
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/* Suspended root hub needs to be polled */
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hcd->poll_rh = 1;
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usb_hcd_poll_rh_status(hcd);
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}
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return 0;
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}
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#endif
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@ -345,9 +345,6 @@ enum uhci_rh_state {
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/*
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* This describes the full uhci information.
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*
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* Note how the "proper" USB information is just
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* a subset of what the full implementation needs.
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*/
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struct uhci_hcd {
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@ -360,8 +357,6 @@ struct uhci_hcd {
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struct dma_pool *qh_pool;
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struct dma_pool *td_pool;
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struct usb_bus *bus;
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struct uhci_td *term_td; /* Terminating TD, see UHCI bug */
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struct uhci_qh *skelqh[UHCI_NUM_SKELQH]; /* Skeleton QH's */
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@ -380,6 +375,8 @@ struct uhci_hcd {
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unsigned int scan_in_progress:1; /* Schedule scan is running */
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unsigned int need_rescan:1; /* Redo the schedule scan */
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unsigned int hc_inaccessible:1; /* HC is suspended or dead */
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unsigned int working_RD:1; /* Suspended root hub doesn't
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need to be polled */
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/* Support for port suspend/resume/reset */
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unsigned long port_c_suspend; /* Bit-arrays of ports */
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@ -405,9 +402,7 @@ struct uhci_hcd {
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/* List of URB's awaiting completion callback */
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struct list_head complete_list; /* P: uhci->lock */
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int rh_numports;
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struct timer_list stall_timer;
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int rh_numports; /* Number of root-hub ports */
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wait_queue_head_t waitqh; /* endpoint_disable waiters */
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};
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@ -145,15 +145,16 @@ static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
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{
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struct uhci_hcd *uhci = hcd_to_uhci(hcd);
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unsigned long flags;
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int status;
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int status = 0;
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spin_lock_irqsave(&uhci->lock, flags);
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if (uhci->hc_inaccessible) {
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status = 0;
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goto done;
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}
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uhci_scan_schedule(uhci, NULL);
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if (uhci->hc_inaccessible)
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goto done;
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check_fsbr(uhci);
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uhci_check_ports(uhci);
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status = get_hub_status_data(uhci, buf);
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switch (uhci->rh_state) {
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@ -33,7 +33,7 @@ static void uhci_free_pending_tds(struct uhci_hcd *uhci);
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static inline void uhci_set_next_interrupt(struct uhci_hcd *uhci)
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{
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if (uhci->is_stopped)
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mod_timer(&uhci->stall_timer, jiffies);
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mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
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uhci->term_td->status |= cpu_to_le32(TD_CTRL_IOC);
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}
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