usb: cdns3: allocate TX FIFO size according to composite EP number

Some devices have USB compositions which may require multiple endpoints.
To get better performance, need bigger CDNS3_EP_BUF_SIZE.

But bigger CDNS3_EP_BUF_SIZE may exceed total hardware FIFO size when
multiple endpoints.

By introducing the check_config() callback, calculate CDNS3_EP_BUF_SIZE.

Move CDNS3_EP_BUF_SIZE into cnds3_device: ep_buf_size
Combine CDNS3_EP_ISO_SS_BURST and CDNS3_EP_ISO_HS_MULT into
cnds3_device:ep_iso_burst

Using a simple algorithm to calculate ep_buf_size.
ep_buf_size = ep_iso_burst = (onchip_buffers - 2k) / (number of IN EP +
1).

Test at 8qxp:

Gadget ep_buf_size

RNDIS: 5
RNDIS+ACM: 3
Mass Storage + NCM + ACM 2

Previous CDNS3_EP_BUF_SIZE is 4, RNDIS + ACM will be failure because
exceed FIFO memory.

Acked-by: Peter Chen <[e-mail]>
Signed-off-by: Frank Li <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/cdns3/cdns3-gadget.c

···
 	u8 mult = 0;
 	int ret;
 
-	buffering = CDNS3_EP_BUF_SIZE - 1;
+	buffering = priv_dev->ep_buf_size - 1;
 
 	cdns3_configure_dmult(priv_dev, priv_ep);
 
···
 		break;
 	default:
 		ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_ISOC);
-		mult = CDNS3_EP_ISO_HS_MULT - 1;
+		mult = priv_dev->ep_iso_burst - 1;
 		buffering = mult + 1;
 	}
 
···
 		mult = 0;
 		max_packet_size = 1024;
 		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
-			maxburst = CDNS3_EP_ISO_SS_BURST - 1;
+			maxburst = priv_dev->ep_iso_burst - 1;
 			buffering = (mult + 1) *
 				    (maxburst + 1);
 
 			if (priv_ep->interval > 1)
 				buffering++;
 		} else {
-			maxburst = CDNS3_EP_BUF_SIZE - 1;
+			maxburst = priv_dev->ep_buf_size - 1;
 		}
 		break;
 	default:
···
 		priv_ep->trb_burst_size = 64;
 	else
 		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);
 
 	/* onchip buffer is only allocated before configuration */
 	if (!priv_dev->hw_configured_flag) {
···
 	return 0;
 }
 
+/**
+ * cdns3_gadget_check_config - ensure cdns3 can support the USB configuration
+ * @gadget: pointer to the USB gadget
+ *
+ * Used to record the maximum number of endpoints being used in a USB composite
+ * device. (across all configurations)  This is to be used in the calculation
+ * of the TXFIFO sizes when resizing internal memory for individual endpoints.
+ * It will help ensured that the resizing logic reserves enough space for at
+ * least one max packet.
+ */
+static int cdns3_gadget_check_config(struct usb_gadget *gadget)
+{
+	struct cdns3_device *priv_dev = gadget_to_cdns3_device(gadget);
+	struct usb_ep *ep;
+	int n_in = 0;
+	int total;
+
+	list_for_each_entry(ep, &gadget->ep_list, ep_list) {
+		if (ep->claimed && (ep->address & USB_DIR_IN))
+			n_in++;
+	}
+
+	/* 2KB are reserved for EP0, 1KB for out*/
+	total = 2 + n_in + 1;
+
+	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);
+
+	return 0;
+}
+
 static const struct usb_gadget_ops cdns3_gadget_ops = {
 	.get_frame = cdns3_gadget_get_frame,
 	.wakeup = cdns3_gadget_wakeup,
···
 	.udc_start = cdns3_gadget_udc_start,
 	.udc_stop = cdns3_gadget_udc_stop,
 	.match_ep = cdns3_gadget_match_ep,
+	.check_config = cdns3_gadget_check_config,
 };
 
 static void cdns3_free_all_eps(struct cdns3_device *priv_dev)

drivers/usb/cdns3/cdns3-gadget.h

···
 /* Max burst size (used only in SS mode). */
 #define EP_CFG_MAXBURST_MASK	GENMASK(11, 8)
 #define EP_CFG_MAXBURST(p)	(((p) << 8) & EP_CFG_MAXBURST_MASK)
+#define EP_CFG_MAXBURST_MAX	15
 /* ISO max burst. */
 #define EP_CFG_MULT_MASK	GENMASK(15, 14)
 #define EP_CFG_MULT(p)		(((p) << 14) & EP_CFG_MULT_MASK)
+#define EP_CFG_MULT_MAX		2
 /* ISO max burst. */
 #define EP_CFG_MAXPKTSIZE_MASK	GENMASK(26, 16)
 #define EP_CFG_MAXPKTSIZE(p)	(((p) << 16) & EP_CFG_MAXPKTSIZE_MASK)
 /* Max number of buffered packets. */
 #define EP_CFG_BUFFERING_MASK	GENMASK(31, 27)
 #define EP_CFG_BUFFERING(p)	(((p) << 27) & EP_CFG_BUFFERING_MASK)
+#define EP_CFG_BUFFERING_MAX	15
 
 /* EP_CMD - bitmasks */
 /* Endpoint reset. */
···
 #define CDNS3_ENDPOINTS_MAX_COUNT	32
 #define CDNS3_EP_ZLP_BUF_SIZE		1024
 
-#define CDNS3_EP_BUF_SIZE		4	/* KB */
-#define CDNS3_EP_ISO_HS_MULT		3
-#define CDNS3_EP_ISO_SS_BURST		3
 #define CDNS3_MAX_NUM_DESCMISS_BUF	32
 #define CDNS3_DESCMIS_BUF_SIZE		2048	/* Bytes */
 #define CDNS3_WA2_NUM_BUFFERS		128
···
 	/*in KB */
 	u16				onchip_buffers;
 	u16				onchip_used_size;
+
+	u16				ep_buf_size;
+	u16				ep_iso_burst;
 };
 
 void cdns3_set_register_bit(void __iomem *ptr, u32 mask);