diff options
| author | Siddharth Vadapalli <s-vadapalli@ti.com> | 2024-10-07 17:49:27 +0530 |
|---|---|---|
| committer | Mattijs Korpershoek <mkorpershoek@baylibre.com> | 2024-10-11 14:32:38 +0200 |
| commit | c54c72dec7948093b200ae1290575a1e9abbbb40 (patch) | |
| tree | b92ae3ed74cc64c08d855fd9fdb9bb7cbce0c196 /drivers/usb/cdns3 | |
| parent | ce1023de730ffa37beae46a5276061a74a041a09 (diff) | |
usb: gadget: cdns3: Fix cdns3_ep_config() by setting ep.maxpacket
The function cdns3_ep_config() calculates the maximum packet size based
on the Endpoint Type and the Gadget Speed and stores it in the variable
"max_packet_size". This value is then programmed in the USB Controller
for the corresponding Endpoint. This may result in a mismatch between
the maximum packet size programmed in the USB controller and the maximum
packet size seen by the UDC Core via "maxpacket" member of "struct usb_ep".
Additionally, since TD_SIZE is calculated in cdns3_ep_run_transfer() on the
basis of the maximum packet size stored in the "maxpacket" member of
"struct usb_ep", it may lead to an incorrect value of TD_SIZE when compared
with what the USB controller actually expects (max_packet_size).
Fix this.
Fixes: 7e91f6ccdc84 ("usb: Add Cadence USB3 host and gadget driver")
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20241007121927.1680039-1-s-vadapalli@ti.com
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Diffstat (limited to 'drivers/usb/cdns3')
| -rw-r--r-- | drivers/usb/cdns3/gadget.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c index ac7e469469a..a30c40ef80e 100644 --- a/drivers/usb/cdns3/gadget.c +++ b/drivers/usb/cdns3/gadget.c @@ -1637,6 +1637,14 @@ void cdns3_ep_config(struct cdns3_endpoint *priv_ep) else priv_ep->trb_burst_size = 16; + /* + * The Endpoint is configured to handle a maximum packet size of + * max_packet_size. Hence, set priv_ep->endpoint.maxpacket to + * max_packet_size. This is necessary to ensure that the TD_SIZE + * is calculated correctly in cdns3_ep_run_transfer(). + */ + priv_ep->endpoint.maxpacket = max_packet_size; + ret = cdns3_ep_onchip_buffer_reserve(priv_dev, buffering + 1, !!priv_ep->dir); if (ret) { |