usb: cdns3: fix iso transfer error when mult is not zero

commit 92f02efa1d86d7dcaef7f38a5fe3396c4e88a93c upstream.

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@vger.kernel.org>
Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20231224153816.1664687-3-Frank.Li@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
index 987b8ee..10ead59 100644 (file)
--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -2064,11 +2064,10 @@ 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;
@@ -2090,8 +2089,7 @@ 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) {
@@ -2102,17 +2100,8 @@ 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;
@@ -2141,7 +2130,6 @@ 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);
 
@@ -2175,7 +2163,7 @@ 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);
 
@@ -2265,6 +2253,13 @@ 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;
@@ -3048,22 +3043,40 @@ 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/cdns3-gadget.h b/drivers/usb/cdns3/cdns3-gadget.h
index fbe4a8e..086a7bb 100644 (file)
--- a/drivers/usb/cdns3/cdns3-gadget.h
+++ b/drivers/usb/cdns3/cdns3-gadget.h
@@ -1168,6 +1168,9 @@ struct cdns3_endpoint {
        u8                      dir;
        u8                      num;
        u8                      type;
+       u8                      mult;
+       u8                      bMaxBurst;
+       u16                     wMaxPacketSize;
        int                     interval;
 
        int                     free_trbs;