From 2d3f139810cd5d491d8dc8c3332c9d32b9b8e1f1 Mon Sep 17 00:00:00 2001 From: Douglas Anderson Date: Thu, 28 Jan 2016 18:20:06 -0800 Subject: usb: dwc2: host: Split code out to make dwc2_do_reserve() This no-op change splits code out of dwc2_schedule_periodic() into a dwc2_do_reserve() function. This makes it a little easier to follow the logic. Acked-by: John Youn Signed-off-by: Douglas Anderson Tested-by: Heiko Stuebner Tested-by: Stefan Wahren Signed-off-by: Felipe Balbi --- drivers/usb/dwc2/hcd_queue.c | 112 ++++++++++++++++++++++++++----------------- 1 file changed, 67 insertions(+), 45 deletions(-) (limited to 'drivers/usb/dwc2') diff --git a/drivers/usb/dwc2/hcd_queue.c b/drivers/usb/dwc2/hcd_queue.c index 8a2067bc1e62..9ce407e5017d 100644 --- a/drivers/usb/dwc2/hcd_queue.c +++ b/drivers/usb/dwc2/hcd_queue.c @@ -244,6 +244,70 @@ static int dwc2_find_uframe(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh) return ret; } +/** + * dwc2_do_reserve() - Make a periodic reservation + * + * Try to allocate space in the periodic schedule. Depending on parameters + * this might use the microframe scheduler or the dumb scheduler. + * + * @hsotg: The HCD state structure for the DWC OTG controller + * @qh: QH for the periodic transfer. + * + * Returns: 0 upon success; error upon failure. + */ +static int dwc2_do_reserve(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh) +{ + int status; + + if (hsotg->core_params->uframe_sched > 0) { + int frame = -1; + + status = dwc2_find_uframe(hsotg, qh); + if (status == 0) + frame = 7; + else if (status > 0) + frame = status - 1; + + /* Set the new frame up */ + if (frame >= 0) { + qh->next_active_frame &= ~0x7; + qh->next_active_frame |= (frame & 7); + dwc2_sch_dbg(hsotg, + "QH=%p sched_p nxt=%04x, uf=%d\n", + qh, qh->next_active_frame, frame); + } + + if (status > 0) + status = 0; + } else { + status = dwc2_periodic_channel_available(hsotg); + if (status) { + dev_info(hsotg->dev, + "%s: No host channel available for periodic transfer\n", + __func__); + return status; + } + + status = dwc2_check_periodic_bandwidth(hsotg, qh); + } + + if (status) { + dev_dbg(hsotg->dev, + "%s: Insufficient periodic bandwidth for periodic transfer\n", + __func__); + return status; + } + + if (hsotg->core_params->uframe_sched <= 0) + /* Reserve periodic channel */ + hsotg->periodic_channels++; + + /* Update claimed usecs per (micro)frame */ + hsotg->periodic_usecs += qh->host_us; + + return 0; +} + /** * dwc2_do_unreserve() - Actually release the periodic reservation * @@ -393,51 +457,9 @@ static int dwc2_schedule_periodic(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh) * that case. */ if (!qh->unreserve_pending) { - if (hsotg->core_params->uframe_sched > 0) { - int frame = -1; - - status = dwc2_find_uframe(hsotg, qh); - if (status == 0) - frame = 7; - else if (status > 0) - frame = status - 1; - - /* Set the new frame up */ - if (frame >= 0) { - qh->next_active_frame &= ~0x7; - qh->next_active_frame |= (frame & 7); - dwc2_sch_dbg(hsotg, - "QH=%p sched_p nxt=%04x, uf=%d\n", - qh, qh->next_active_frame, frame); - } - - if (status > 0) - status = 0; - } else { - status = dwc2_periodic_channel_available(hsotg); - if (status) { - dev_info(hsotg->dev, - "%s: No host channel available for periodic transfer\n", - __func__); - return status; - } - - status = dwc2_check_periodic_bandwidth(hsotg, qh); - } - - if (status) { - dev_dbg(hsotg->dev, - "%s: Insufficient periodic bandwidth for periodic transfer\n", - __func__); + status = dwc2_do_reserve(hsotg, qh); + if (status) return status; - } - - if (hsotg->core_params->uframe_sched <= 0) - /* Reserve periodic channel */ - hsotg->periodic_channels++; - - /* Update claimed usecs per (micro)frame */ - hsotg->periodic_usecs += qh->host_us; } qh->unreserve_pending = 0; @@ -450,7 +472,7 @@ static int dwc2_schedule_periodic(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh) list_add_tail(&qh->qh_list_entry, &hsotg->periodic_sched_inactive); - return status; + return 0; } /** -- cgit v1.2.3