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135 lines
5.0 KiB
135 lines
5.0 KiB
9 years ago
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From cab5abd144fc154c140f9f522c3c2f81a94aaa74 Mon Sep 17 00:00:00 2001
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From: P33M <P33M@github.com>
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Date: Tue, 4 Aug 2015 01:15:20 +0100
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Subject: [PATCH 149/171] dwc_otg: fiq_fsm: Make high-speed isochronous strided
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transfers work properly
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Certain low-bandwidth high-speed USB devices (specialist audio devices,
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compressed-frame webcams) have packet intervals > 1 microframe.
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Stride these transfers in the FIQ by using the start-of-frame interrupt
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to restart the channel at the right time.
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---
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drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c | 17 +++++++++++++----
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drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h | 5 ++++-
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drivers/usb/host/dwc_otg/dwc_otg_hcd.c | 7 ++++++-
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drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c | 6 ++++--
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4 files changed, 27 insertions(+), 8 deletions(-)
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--- a/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c
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@@ -615,8 +615,11 @@ static int notrace noinline fiq_fsm_do_s
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break;
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case FIQ_HS_ISOC_SLEEPING:
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- state->channel[n].fsm = FIQ_HS_ISOC_TURBO;
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- fiq_fsm_restart_channel(state, n, 0);
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+ /* Is it time to wake this channel yet? */
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+ if (--state->channel[n].uframe_sleeps == 0) {
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+ state->channel[n].fsm = FIQ_HS_ISOC_TURBO;
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+ fiq_fsm_restart_channel(state, n, 0);
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+ }
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break;
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case FIQ_PER_SSPLIT_QUEUED:
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@@ -624,7 +627,7 @@ static int notrace noinline fiq_fsm_do_s
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break;
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if(!fiq_fsm_tt_in_use(state, num_channels, n)) {
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if (!fiq_fsm_too_late(state, n)) {
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- fiq_print(FIQDBG_INT, st, "SOF GO %01d", n);
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+ fiq_print(FIQDBG_INT, state, "SOF GO %01d", n);
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fiq_fsm_restart_channel(state, n, 0);
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state->channel[n].fsm = FIQ_PER_SSPLIT_STARTED;
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} else {
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@@ -1069,8 +1072,14 @@ static int notrace noinline fiq_fsm_do_h
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if (fiq_fsm_update_hs_isoc(state, n, hcint)) {
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/* more transactions to come */
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handled = 1;
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- restart = 1;
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fiq_print(FIQDBG_INT, state, "HSISO M ");
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+ /* For strided transfers, put ourselves to sleep */
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+ if (st->hs_isoc_info.stride > 1) {
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+ st->uframe_sleeps = st->hs_isoc_info.stride - 1;
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+ st->fsm = FIQ_HS_ISOC_SLEEPING;
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+ } else {
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+ restart = 1;
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+ }
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} else {
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st->fsm = FIQ_HS_ISOC_DONE;
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fiq_print(FIQDBG_INT, state, "HSISO F ");
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--- a/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h
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@@ -260,12 +260,13 @@ struct fiq_dma_blob {
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* @iso_frame: Pointer to the array of OTG URB iso_frame_descs.
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* @nrframes: Total length of iso_frame_desc array
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* @index: Current index (FIQ-maintained)
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- *
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+ * @stride: Interval in uframes between HS isoc transactions
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*/
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struct fiq_hs_isoc_info {
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struct dwc_otg_hcd_iso_packet_desc *iso_desc;
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unsigned int nrframes;
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unsigned int index;
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+ unsigned int stride;
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};
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/**
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@@ -296,6 +297,8 @@ struct fiq_channel_state {
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/* Hardware bug workaround: sometimes channel halt interrupts are
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* delayed until the next SOF. Keep track of when we expected to get interrupted. */
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unsigned int expected_uframe;
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+ /* number of uframes remaining (for interval > 1 HS isoc transfers) before next transfer */
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+ unsigned int uframe_sleeps;
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/* in/out for communicating number of dma buffers used, or number of ISOC to do */
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unsigned int nrpackets;
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struct fiq_dma_info dma_info;
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--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c
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@@ -1678,6 +1678,9 @@ int fiq_fsm_queue_isoc_transaction(dwc_o
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}
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}
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+ st->hs_isoc_info.stride = qh->interval;
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+ st->uframe_sleeps = 0;
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+
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fiq_print(FIQDBG_INT, hcd->fiq_state, "FSMQ %01d ", hc->hc_num);
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fiq_print(FIQDBG_INT, hcd->fiq_state, "%08x", st->hcchar_copy.d32);
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fiq_print(FIQDBG_INT, hcd->fiq_state, "%08x", st->hctsiz_copy.d32);
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@@ -1692,9 +1695,11 @@ int fiq_fsm_queue_isoc_transaction(dwc_o
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DWC_WRITE_REG32(&hc_regs->hcintmsk, st->hcintmsk_copy.d32);
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if (hfnum.b.frrem < PERIODIC_FRREM_BACKOFF) {
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/* Prevent queueing near EOF1. Bad things happen if a periodic
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- * split transaction is queued very close to EOF.
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+ * split transaction is queued very close to EOF. SOF interrupt handler
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+ * will wake this channel at the next interrupt.
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*/
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st->fsm = FIQ_HS_ISOC_SLEEPING;
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+ st->uframe_sleeps = 1;
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} else {
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st->fsm = FIQ_HS_ISOC_TURBO;
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st->hcchar_copy.b.chen = 1;
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--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
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+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c
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@@ -2297,10 +2297,10 @@ void dwc_otg_fiq_unmangle_isoc(dwc_otg_h
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dwc_urb->error_count++;
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}
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}
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+ qh->sched_frame = dwc_frame_num_inc(qh->sched_frame, qh->interval * (nr_frames - 1));
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+
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//printk_ratelimited(KERN_INFO "%s: HS isochronous of %d/%d frames with %d errors complete\n",
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// __FUNCTION__, i, dwc_urb->packet_count, dwc_urb->error_count);
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- hcd->fops->complete(hcd, dwc_urb->priv, dwc_urb, 0);
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- release_channel(hcd, qh->channel, qtd, DWC_OTG_HC_XFER_URB_COMPLETE);
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}
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/**
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@@ -2543,6 +2543,8 @@ void dwc_otg_hcd_handle_hc_fsm(dwc_otg_h
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* fail.
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*/
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dwc_otg_fiq_unmangle_isoc(hcd, qh, qtd, num);
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+ hcd->fops->complete(hcd, qtd->urb->priv, qtd->urb, 0);
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+ release_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_URB_COMPLETE);
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break;
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case FIQ_PER_SPLIT_LS_ABORTED:
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