bf28fb50bf
As usual, this patches were taken (and rebased) from https://github.com/raspberrypi/linux/commits/rpi-4.1.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com> SVN-Revision: 47258
134 lines
5 KiB
Diff
134 lines
5 KiB
Diff
From c069d755e30358e19c9c5f93f0e3748827a91c9d Mon Sep 17 00:00:00 2001
|
|
From: P33M <P33M@github.com>
|
|
Date: Tue, 4 Aug 2015 01:15:20 +0100
|
|
Subject: [PATCH 149/203] 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:
|