diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0149-dwc_otg-fiq_fsm-Make-high-speed-isochronous-strided-.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.1/0149-dwc_otg-fiq_fsm-Make-high-speed-isochronous-strided-.patch | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0149-dwc_otg-fiq_fsm-Make-high-speed-isochronous-strided-.patch b/target/linux/brcm2708/patches-4.1/0149-dwc_otg-fiq_fsm-Make-high-speed-isochronous-strided-.patch new file mode 100644 index 0000000..c3f481f --- /dev/null +++ b/target/linux/brcm2708/patches-4.1/0149-dwc_otg-fiq_fsm-Make-high-speed-isochronous-strided-.patch @@ -0,0 +1,134 @@ +From cab5abd144fc154c140f9f522c3c2f81a94aaa74 Mon Sep 17 00:00:00 2001 +From: P33M <P33M@github.com> +Date: Tue, 4 Aug 2015 01:15:20 +0100 +Subject: [PATCH 149/171] dwc_otg: fiq_fsm: Make high-speed isochronous strided + transfers work properly + +Certain low-bandwidth high-speed USB devices (specialist audio devices, +compressed-frame webcams) have packet intervals > 1 microframe. + +Stride these transfers in the FIQ by using the start-of-frame interrupt +to restart the channel at the right time. +--- + drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c | 17 +++++++++++++---- + drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h | 5 ++++- + drivers/usb/host/dwc_otg/dwc_otg_hcd.c | 7 ++++++- + drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c | 6 ++++-- + 4 files changed, 27 insertions(+), 8 deletions(-) + +--- a/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c ++++ b/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c +@@ -615,8 +615,11 @@ static int notrace noinline fiq_fsm_do_s + break; + + case FIQ_HS_ISOC_SLEEPING: +- state->channel[n].fsm = FIQ_HS_ISOC_TURBO; +- fiq_fsm_restart_channel(state, n, 0); ++ /* Is it time to wake this channel yet? */ ++ if (--state->channel[n].uframe_sleeps == 0) { ++ state->channel[n].fsm = FIQ_HS_ISOC_TURBO; ++ fiq_fsm_restart_channel(state, n, 0); ++ } + break; + + case FIQ_PER_SSPLIT_QUEUED: +@@ -624,7 +627,7 @@ static int notrace noinline fiq_fsm_do_s + break; + if(!fiq_fsm_tt_in_use(state, num_channels, n)) { + if (!fiq_fsm_too_late(state, n)) { +- fiq_print(FIQDBG_INT, st, "SOF GO %01d", n); ++ fiq_print(FIQDBG_INT, state, "SOF GO %01d", n); + fiq_fsm_restart_channel(state, n, 0); + state->channel[n].fsm = FIQ_PER_SSPLIT_STARTED; + } else { +@@ -1069,8 +1072,14 @@ static int notrace noinline fiq_fsm_do_h + if (fiq_fsm_update_hs_isoc(state, n, hcint)) { + /* more transactions to come */ + handled = 1; +- restart = 1; + fiq_print(FIQDBG_INT, state, "HSISO M "); ++ /* For strided transfers, put ourselves to sleep */ ++ if (st->hs_isoc_info.stride > 1) { ++ st->uframe_sleeps = st->hs_isoc_info.stride - 1; ++ st->fsm = FIQ_HS_ISOC_SLEEPING; ++ } else { ++ restart = 1; ++ } + } else { + st->fsm = FIQ_HS_ISOC_DONE; + fiq_print(FIQDBG_INT, state, "HSISO F "); +--- a/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h ++++ b/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.h +@@ -260,12 +260,13 @@ struct fiq_dma_blob { + * @iso_frame: Pointer to the array of OTG URB iso_frame_descs. + * @nrframes: Total length of iso_frame_desc array + * @index: Current index (FIQ-maintained) +- * ++ * @stride: Interval in uframes between HS isoc transactions + */ + struct fiq_hs_isoc_info { + struct dwc_otg_hcd_iso_packet_desc *iso_desc; + unsigned int nrframes; + unsigned int index; ++ unsigned int stride; + }; + + /** +@@ -296,6 +297,8 @@ struct fiq_channel_state { + /* Hardware bug workaround: sometimes channel halt interrupts are + * delayed until the next SOF. Keep track of when we expected to get interrupted. */ + unsigned int expected_uframe; ++ /* number of uframes remaining (for interval > 1 HS isoc transfers) before next transfer */ ++ unsigned int uframe_sleeps; + /* in/out for communicating number of dma buffers used, or number of ISOC to do */ + unsigned int nrpackets; + struct fiq_dma_info dma_info; +--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c ++++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c +@@ -1678,6 +1678,9 @@ int fiq_fsm_queue_isoc_transaction(dwc_o + } + } + ++ st->hs_isoc_info.stride = qh->interval; ++ st->uframe_sleeps = 0; ++ + fiq_print(FIQDBG_INT, hcd->fiq_state, "FSMQ %01d ", hc->hc_num); + fiq_print(FIQDBG_INT, hcd->fiq_state, "%08x", st->hcchar_copy.d32); + fiq_print(FIQDBG_INT, hcd->fiq_state, "%08x", st->hctsiz_copy.d32); +@@ -1692,9 +1695,11 @@ int fiq_fsm_queue_isoc_transaction(dwc_o + DWC_WRITE_REG32(&hc_regs->hcintmsk, st->hcintmsk_copy.d32); + if (hfnum.b.frrem < PERIODIC_FRREM_BACKOFF) { + /* Prevent queueing near EOF1. Bad things happen if a periodic +- * split transaction is queued very close to EOF. ++ * split transaction is queued very close to EOF. SOF interrupt handler ++ * will wake this channel at the next interrupt. + */ + st->fsm = FIQ_HS_ISOC_SLEEPING; ++ st->uframe_sleeps = 1; + } else { + st->fsm = FIQ_HS_ISOC_TURBO; + st->hcchar_copy.b.chen = 1; +--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c ++++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_intr.c +@@ -2297,10 +2297,10 @@ void dwc_otg_fiq_unmangle_isoc(dwc_otg_h + dwc_urb->error_count++; + } + } ++ qh->sched_frame = dwc_frame_num_inc(qh->sched_frame, qh->interval * (nr_frames - 1)); ++ + //printk_ratelimited(KERN_INFO "%s: HS isochronous of %d/%d frames with %d errors complete\n", + // __FUNCTION__, i, dwc_urb->packet_count, dwc_urb->error_count); +- hcd->fops->complete(hcd, dwc_urb->priv, dwc_urb, 0); +- release_channel(hcd, qh->channel, qtd, DWC_OTG_HC_XFER_URB_COMPLETE); + } + + /** +@@ -2543,6 +2543,8 @@ void dwc_otg_hcd_handle_hc_fsm(dwc_otg_h + * fail. + */ + dwc_otg_fiq_unmangle_isoc(hcd, qh, qtd, num); ++ hcd->fops->complete(hcd, qtd->urb->priv, qtd->urb, 0); ++ release_channel(hcd, hc, qtd, DWC_OTG_HC_XFER_URB_COMPLETE); + break; + + case FIQ_PER_SPLIT_LS_ABORTED: |