This is a note to let you know that I've just added the patch titled
usb: cdns3: fix uvc failure work since sg support enabled
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-cdns3-fix-uvc-failure-work-since-sg-support-enab.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a333a132b7738e81197e1a6a82b54b832bed1590
Author: Frank Li <Frank.Li@xxxxxxx>
Date: Sun Dec 24 10:38:13 2023 -0500
usb: cdns3: fix uvc failure work since sg support enabled
[ Upstream commit 1b8be5ecff26201bafb0a554c74e91571299fb94 ]
When IP version >= DEV_VER_V2, gadget:sg_supported is true. So uvc gadget
function driver will use sg to equeue data, first is 8bytes header, the
second is 1016bytes data.
cdns3_prepare_trb: ep2in: trb 0000000000ac755f, dma buf: 0xbf455000, size: 8, burst: 128 ctrl: 0x00000415 (C=1, T=0, ISP, CHAIN, Normal)
cdns3_prepare_trb: ep2in: trb 00000000a574e693, dma buf: 0xc0200fe0, size: 1016, burst: 128 ctrl: 0x00000405 (C=1, T=0, ISP, Normal)
But cdns3_ep_run_transfer() can't correctly handle this case, which only
support one TRB for ISO transfer.
The controller requires duplicate the TD for each SOF if priv_ep->interval
is not 1. DMA will read data from DDR to internal FIFO when get SOF. Send
data to bus when receive IN token. DMA always refill FIFO when get SOF
regardless host send IN token or not. If host send IN token later, some
frames data will be lost.
Fixed it by below major steps:
1. Calculate numembers of TRB base on sg_nums and priv_ep->interval.
2. Remove CHAIN flags for each end TRB of TD when duplicate TD.
3. The controller requires LINK TRB must be first TRB of TD. When check
there are not enough TRBs lefts, just fill LINK TRB for left TRBs.
.... CHAIN_TRB DATA_TRB, CHAIN_TRB DATA_TRB, LINK_TRB ... LINK_TRB
^End of TRB List
Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
Link: https://lore.kernel.org/r/20231224153816.1664687-2-Frank.Li@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
index 82b6fd2bc890..575180a59ad4 100644
--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -1118,6 +1118,7 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
dma_addr_t trb_dma;
u32 togle_pcs = 1;
int sg_iter = 0;
+ int num_trb_req;
int num_trb;
int address;
u32 control;
@@ -1126,15 +1127,13 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
struct scatterlist *s = NULL;
bool sg_supported = !!(request->num_mapped_sgs);
+ num_trb_req = sg_supported ? request->num_mapped_sgs : 1;
+
+ /* ISO transfer require each SOF have a TD, each TD include some TRBs */
if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
- num_trb = priv_ep->interval;
+ num_trb = priv_ep->interval * num_trb_req;
else
- num_trb = sg_supported ? request->num_mapped_sgs : 1;
-
- if (num_trb > priv_ep->free_trbs) {
- priv_ep->flags |= EP_RING_FULL;
- return -ENOBUFS;
- }
+ num_trb = num_trb_req;
priv_req = to_cdns3_request(request);
address = priv_ep->endpoint.desc->bEndpointAddress;
@@ -1183,14 +1182,31 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
link_trb->control = cpu_to_le32(((priv_ep->pcs) ? TRB_CYCLE : 0) |
TRB_TYPE(TRB_LINK) | TRB_TOGGLE | ch_bit);
+
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
+ /*
+ * ISO require LINK TRB must be first one of TD.
+ * Fill LINK TRBs for left trb space to simply software process logic.
+ */
+ while (priv_ep->enqueue) {
+ *trb = *link_trb;
+ trace_cdns3_prepare_trb(priv_ep, trb);
+
+ cdns3_ep_inc_enq(priv_ep);
+ trb = priv_ep->trb_pool + priv_ep->enqueue;
+ priv_req->trb = trb;
+ }
+ }
+ }
+
+ if (num_trb > priv_ep->free_trbs) {
+ priv_ep->flags |= EP_RING_FULL;
+ return -ENOBUFS;
}
if (priv_dev->dev_ver <= DEV_VER_V2)
togle_pcs = cdns3_wa1_update_guard(priv_ep, trb);
- if (sg_supported)
- s = request->sg;
-
/* set incorrect Cycle Bit for first trb*/
control = priv_ep->pcs ? 0 : TRB_CYCLE;
trb->length = 0;
@@ -1208,6 +1224,9 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
do {
u32 length;
+ if (!(sg_iter % num_trb_req) && sg_supported)
+ s = request->sg;
+
/* fill TRB */
control |= TRB_TYPE(TRB_NORMAL);
if (sg_supported) {
@@ -1249,7 +1268,7 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
if (sg_supported) {
trb->control |= cpu_to_le32(TRB_ISP);
/* Don't set chain bit for last TRB */
- if (sg_iter < num_trb - 1)
+ if ((sg_iter % num_trb_req) < num_trb_req - 1)
trb->control |= cpu_to_le32(TRB_CHAIN);
s = sg_next(s);
@@ -1507,6 +1526,12 @@ static void cdns3_transfer_completed(struct cdns3_device *priv_dev,
/* The TRB was changed as link TRB, and the request was handled at ep_dequeue */
while (TRB_FIELD_TO_TYPE(le32_to_cpu(trb->control)) == TRB_LINK) {
+
+ /* ISO ep_traddr may stop at LINK TRB */
+ if (priv_ep->dequeue == cdns3_get_dma_pos(priv_dev, priv_ep) &&
+ priv_ep->type == USB_ENDPOINT_XFER_ISOC)
+ break;
+
trace_cdns3_complete_trb(priv_ep, trb);
cdns3_ep_inc_deq(priv_ep);
trb = priv_ep->trb_pool + priv_ep->dequeue;
@@ -1539,6 +1564,10 @@ static void cdns3_transfer_completed(struct cdns3_device *priv_dev,
}
if (request_handled) {
+ /* TRBs are duplicated by priv_ep->interval time for ISO IN */
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && priv_ep->dir)
+ request->actual /= priv_ep->interval;
+
cdns3_gadget_giveback(priv_ep, priv_req, 0);
request_handled = false;
transfer_end = false;
