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Date: Tue, 26 Apr 2022 10:49:54 -0500
From: Frank Li <Frank.Li@....com>
To: peter.chen@...nel.org, pawell@...ence.com, rogerq@...nel.org,
a-govindraju@...com, linux-usb@...r.kernel.org, jun.li@....com,
lznuaa@...il.com
Cc: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] 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
ecnds3_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.
Signed-off-by: Frank Li <Frank.Li@....com>
---
drivers/usb/cdns3/cdns3-gadget.c | 46 +++++++++++++++++++++++++++++---
drivers/usb/cdns3/cdns3-gadget.h | 6 ++---
2 files changed, 45 insertions(+), 7 deletions(-)
diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
index 1f3b4a1422126..62ea1bd773386 100644
--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -2050,7 +2050,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
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);
@@ -2069,7 +2069,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
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;
}
@@ -2085,14 +2085,14 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
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:
@@ -2970,6 +2970,43 @@ static int cdns3_gadget_udc_stop(struct usb_gadget *gadget)
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++;
+ }
+
+ priv_dev->ep_buf_size = 1;
+ priv_dev->ep_iso_burst = 1;
+
+ /* 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,
@@ -2978,6 +3015,7 @@ static const struct usb_gadget_ops cdns3_gadget_ops = {
.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)
diff --git a/drivers/usb/cdns3/cdns3-gadget.h b/drivers/usb/cdns3/cdns3-gadget.h
index c5660f2c4293f..f333c34b93ffb 100644
--- a/drivers/usb/cdns3/cdns3-gadget.h
+++ b/drivers/usb/cdns3/cdns3-gadget.h
@@ -1094,9 +1094,6 @@ struct cdns3_trb {
#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
@@ -1333,6 +1330,9 @@ struct cdns3_device {
/*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);
--
2.35.1
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