This is a note to let you know that I've just added the patch titled
usb: cdns3: fix iso transfer error when mult is not zero
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-iso-transfer-error-when-mult-is-not-ze.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 e23d833d5044217a5b2f6b2ca936279619fda4ff
Author: Frank Li <Frank.Li@xxxxxxx>
Date: Sun Dec 24 10:38:14 2023 -0500
usb: cdns3: fix iso transfer error when mult is not zero
[ Upstream commit 92f02efa1d86d7dcaef7f38a5fe3396c4e88a93c ]
ISO basic transfer is
ITP(SOF) Package_0 Package_1 ... Package_n
CDNS3 DMA start dma transfer from memmory to internal FIFO when get SOF,
controller will transfer data to usb bus from internal FIFO when get IN
token.
According USB spec defination:
Maximum number of packets = (bMaxBurst + 1) * (Mult + 1)
Internal memory should be the same as (bMaxBurst + 1) * (Mult + 1). DMA
don't fetch data advance when ISO transfer, so only reserve
(bMaxBurst + 1) * (Mult + 1) internal memory for ISO transfer.
Need save Mult and bMaxBurst information and set it into EP_CFG register,
otherwise only 1 package is sent by controller, other package will be
lost.
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/20231224153816.1664687-3-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 ee64c4ab8dd2..118c9402bb60 100644
--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -2063,11 +2063,10 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
bool is_iso_ep = (priv_ep->type == USB_ENDPOINT_XFER_ISOC);
struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
u32 bEndpointAddress = priv_ep->num | priv_ep->dir;
- u32 max_packet_size = 0;
- u8 maxburst = 0;
+ u32 max_packet_size = priv_ep->wMaxPacketSize;
+ u8 maxburst = priv_ep->bMaxBurst;
u32 ep_cfg = 0;
u8 buffering;
- u8 mult = 0;
int ret;
buffering = priv_dev->ep_buf_size - 1;
@@ -2089,8 +2088,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
break;
default:
ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_ISOC);
- mult = priv_dev->ep_iso_burst - 1;
- buffering = mult + 1;
+ buffering = (priv_ep->bMaxBurst + 1) * (priv_ep->mult + 1) - 1;
}
switch (priv_dev->gadget.speed) {
@@ -2101,17 +2099,8 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
max_packet_size = is_iso_ep ? 1024 : 512;
break;
case USB_SPEED_SUPER:
- /* It's limitation that driver assumes in driver. */
- mult = 0;
- max_packet_size = 1024;
- if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
- maxburst = priv_dev->ep_iso_burst - 1;
- buffering = (mult + 1) *
- (maxburst + 1);
-
- if (priv_ep->interval > 1)
- buffering++;
- } else {
+ if (priv_ep->type != USB_ENDPOINT_XFER_ISOC) {
+ max_packet_size = 1024;
maxburst = priv_dev->ep_buf_size - 1;
}
break;
@@ -2140,7 +2129,6 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
if (priv_dev->dev_ver < DEV_VER_V2)
priv_ep->trb_burst_size = 16;
- mult = min_t(u8, mult, EP_CFG_MULT_MAX);
buffering = min_t(u8, buffering, EP_CFG_BUFFERING_MAX);
maxburst = min_t(u8, maxburst, EP_CFG_MAXBURST_MAX);
@@ -2174,7 +2162,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
}
ep_cfg |= EP_CFG_MAXPKTSIZE(max_packet_size) |
- EP_CFG_MULT(mult) |
+ EP_CFG_MULT(priv_ep->mult) | /* must match EP setting */
EP_CFG_BUFFERING(buffering) |
EP_CFG_MAXBURST(maxburst);
@@ -2264,6 +2252,13 @@ usb_ep *cdns3_gadget_match_ep(struct usb_gadget *gadget,
priv_ep->type = usb_endpoint_type(desc);
priv_ep->flags |= EP_CLAIMED;
priv_ep->interval = desc->bInterval ? BIT(desc->bInterval - 1) : 0;
+ priv_ep->wMaxPacketSize = usb_endpoint_maxp(desc);
+ priv_ep->mult = USB_EP_MAXP_MULT(priv_ep->wMaxPacketSize);
+ priv_ep->wMaxPacketSize &= USB_ENDPOINT_MAXP_MASK;
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && comp_desc) {
+ priv_ep->mult = USB_SS_MULT(comp_desc->bmAttributes) - 1;
+ priv_ep->bMaxBurst = comp_desc->bMaxBurst;
+ }
spin_unlock_irqrestore(&priv_dev->lock, flags);
return &priv_ep->endpoint;
@@ -3033,22 +3028,40 @@ static int cdns3_gadget_check_config(struct usb_gadget *gadget)
struct cdns3_endpoint *priv_ep;
struct usb_ep *ep;
int n_in = 0;
+ int iso = 0;
+ int out = 1;
int total;
+ int n;
list_for_each_entry(ep, &gadget->ep_list, ep_list) {
priv_ep = ep_to_cdns3_ep(ep);
- if ((priv_ep->flags & EP_CLAIMED) && (ep->address & USB_DIR_IN))
- n_in++;
+ if (!(priv_ep->flags & EP_CLAIMED))
+ continue;
+
+ n = (priv_ep->mult + 1) * (priv_ep->bMaxBurst + 1);
+ if (ep->address & USB_DIR_IN) {
+ /*
+ * ISO transfer: DMA start move data when get ISO, only transfer
+ * data as min(TD size, iso). No benefit for allocate bigger
+ * internal memory than 'iso'.
+ */
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
+ iso += n;
+ else
+ n_in++;
+ } else {
+ if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
+ out = max_t(int, out, n);
+ }
}
/* 2KB are reserved for EP0, 1KB for out*/
- total = 2 + n_in + 1;
+ total = 2 + n_in + out + iso;
if (total > priv_dev->onchip_buffers)
return -ENOMEM;
- priv_dev->ep_buf_size = priv_dev->ep_iso_burst =
- (priv_dev->onchip_buffers - 2) / (n_in + 1);
+ priv_dev->ep_buf_size = (priv_dev->onchip_buffers - 2 - iso) / (n_in + out);
return 0;
}
diff --git a/drivers/usb/cdns3/gadget.h b/drivers/usb/cdns3/gadget.h
index 32825477edd3..aeb2211228c1 100644
--- a/drivers/usb/cdns3/gadget.h
+++ b/drivers/usb/cdns3/gadget.h
@@ -1167,6 +1167,9 @@ struct cdns3_endpoint {
u8 dir;
u8 num;
u8 type;
+ u8 mult;
+ u8 bMaxBurst;
+ u16 wMaxPacketSize;
int interval;
int free_trbs;
