summaryrefslogtreecommitdiff
path: root/drivers/usb/dwc3
diff options
context:
space:
mode:
authorFelipe Balbi <felipe.balbi@linux.intel.com>2017-01-23 18:01:59 +0200
committerFelipe Balbi <felipe.balbi@linux.intel.com>2017-01-25 12:49:00 +0200
commit28781789051ef65ced5dbc40734bfacb5e1e8ea4 (patch)
tree8fef6c9a46ee8c698135e3c7ea826558400e54ad /drivers/usb/dwc3
parent3c6aea7344c363f298bfb9952e2906b9574f59dc (diff)
usb: dwc3: gadget: read IN ep FIFO size from HW
Instead of assuming all IN endpoints support 1024 bytes, let's read the actual value from HW and pass that to gadget API. Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc3')
-rw-r--r--drivers/usb/dwc3/gadget.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 0a664d8eba3f..4db97ecae885 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1967,6 +1967,44 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
dep->endpoint.ops = &dwc3_gadget_ep0_ops;
if (!epnum)
dwc->gadget.ep0 = &dep->endpoint;
+ } else if (direction) {
+ int mdwidth;
+ int size;
+ int ret;
+ int num;
+
+ mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
+ /* MDWIDTH is represented in bits, we need it in bytes */
+ mdwidth /= 8;
+
+ size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(i));
+ size = DWC3_GTXFIFOSIZ_TXFDEF(size);
+
+ /* FIFO Depth is in MDWDITH bytes. Multiply */
+ size *= mdwidth;
+
+ num = size / 1024;
+ if (num == 0)
+ num = 1;
+
+ /*
+ * FIFO sizes account an extra MDWIDTH * (num + 1) bytes for
+ * internal overhead. We don't really know how these are used,
+ * but documentation say it exists.
+ */
+ size -= mdwidth * (num + 1);
+ size /= num;
+
+ usb_ep_set_maxpacket_limit(&dep->endpoint, size);
+
+ dep->endpoint.max_streams = 15;
+ dep->endpoint.ops = &dwc3_gadget_ep_ops;
+ list_add_tail(&dep->endpoint.ep_list,
+ &dwc->gadget.ep_list);
+
+ ret = dwc3_alloc_trb_pool(dep);
+ if (ret)
+ return ret;
} else {
int ret;