diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0394-dwc_otg-fiq_fsm-pause-when-cancelling-split-transact.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0394-dwc_otg-fiq_fsm-pause-when-cancelling-split-transact.patch | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0394-dwc_otg-fiq_fsm-pause-when-cancelling-split-transact.patch b/target/linux/bcm27xx/patches-5.4/950-0394-dwc_otg-fiq_fsm-pause-when-cancelling-split-transact.patch new file mode 100644 index 0000000000..0a7356ffa2 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0394-dwc_otg-fiq_fsm-pause-when-cancelling-split-transact.patch @@ -0,0 +1,95 @@ +From 09648b92a71b03450e9482f0cc5bd22298f78d44 Mon Sep 17 00:00:00 2001 +From: Jonathan Bell <jonathan@raspberrypi.org> +Date: Wed, 8 Jan 2020 12:48:09 +0000 +Subject: [PATCH] dwc_otg: fiq_fsm: pause when cancelling split + transactions + +Non-periodic splits will DMA to/from the driver-provided transfer_buffer, +which may be freed immediately after the dequeue call returns. Block until +we know the transfer is complete. + +A similar delay is needed when cleaning up disconnects, as the FIQ could +have started a periodic transfer in the previous microframe to the one +that triggered a disconnect. + +Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org> +--- + drivers/usb/host/dwc_otg/dwc_otg_hcd.c | 33 +++++++++++++++++++++-- + drivers/usb/host/dwc_otg/dwc_otg_os_dep.h | 1 + + 2 files changed, 32 insertions(+), 2 deletions(-) + +--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd.c ++++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd.c +@@ -175,6 +175,7 @@ static void kill_urbs_in_qh_list(dwc_otg + dwc_list_link_t *qh_item, *qh_tmp; + dwc_otg_qh_t *qh; + dwc_otg_qtd_t *qtd, *qtd_tmp; ++ int quiesced = 0; + + DWC_LIST_FOREACH_SAFE(qh_item, qh_tmp, qh_list) { + qh = DWC_LIST_ENTRY(qh_item, dwc_otg_qh_t, qh_list_entry); +@@ -198,8 +199,17 @@ static void kill_urbs_in_qh_list(dwc_otg + qh->channel->halt_status = DWC_OTG_HC_XFER_URB_DEQUEUE; + qh->channel->halt_pending = 1; + if (hcd->fiq_state->channel[n].fsm == FIQ_HS_ISOC_TURBO || +- hcd->fiq_state->channel[n].fsm == FIQ_HS_ISOC_SLEEPING) ++ hcd->fiq_state->channel[n].fsm == FIQ_HS_ISOC_SLEEPING) + hcd->fiq_state->channel[n].fsm = FIQ_HS_ISOC_ABORTED; ++ /* We're called from disconnect callback or in the middle of freeing the HCD here, ++ * so FIQ is disabled, top-level interrupts masked and we're holding the spinlock. ++ * No further URBs will be submitted, but wait 1 microframe for any previously ++ * submitted periodic DMA to finish. ++ */ ++ if (!quiesced) { ++ udelay(125); ++ quiesced = 1; ++ } + } else { + dwc_otg_hc_halt(hcd->core_if, qh->channel, + DWC_OTG_HC_XFER_URB_DEQUEUE); +@@ -600,15 +610,34 @@ int dwc_otg_hcd_urb_dequeue(dwc_otg_hcd_ + /* In FIQ FSM mode, we need to shut down carefully. + * The FIQ may attempt to restart a disabled channel */ + if (fiq_fsm_enable && (hcd->fiq_state->channel[n].fsm != FIQ_PASSTHROUGH)) { ++ int retries = 3; ++ int running = 0; ++ enum fiq_fsm_state state; ++ + local_fiq_disable(); + fiq_fsm_spin_lock(&hcd->fiq_state->lock); + qh->channel->halt_status = DWC_OTG_HC_XFER_URB_DEQUEUE; + qh->channel->halt_pending = 1; + if (hcd->fiq_state->channel[n].fsm == FIQ_HS_ISOC_TURBO || +- hcd->fiq_state->channel[n].fsm == FIQ_HS_ISOC_SLEEPING) ++ hcd->fiq_state->channel[n].fsm == FIQ_HS_ISOC_SLEEPING) + hcd->fiq_state->channel[n].fsm = FIQ_HS_ISOC_ABORTED; + fiq_fsm_spin_unlock(&hcd->fiq_state->lock); + local_fiq_enable(); ++ ++ if (dwc_qh_is_non_per(qh)) { ++ do { ++ state = READ_ONCE(hcd->fiq_state->channel[n].fsm); ++ running = (state != FIQ_NP_SPLIT_DONE) && ++ (state != FIQ_NP_SPLIT_LS_ABORTED) && ++ (state != FIQ_NP_SPLIT_HS_ABORTED); ++ if (!running) ++ break; ++ udelay(125); ++ } while(--retries); ++ if (!retries) ++ DWC_WARN("Timed out waiting for FSM NP transfer to complete on %d", ++ qh->channel->hc_num); ++ } + } else { + dwc_otg_hc_halt(hcd->core_if, qh->channel, + DWC_OTG_HC_XFER_URB_DEQUEUE); +--- a/drivers/usb/host/dwc_otg/dwc_otg_os_dep.h ++++ b/drivers/usb/host/dwc_otg/dwc_otg_os_dep.h +@@ -27,6 +27,7 @@ + #include <linux/workqueue.h> + #include <linux/stat.h> + #include <linux/pci.h> ++#include <linux/compiler.h> + + #include <linux/version.h> + |