diff options
| author | Thinh Nguyen <Thinh.Nguyen@synopsys.com> | 2021-02-08 13:53:10 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-03 16:44:21 +0100 |
| commit | b2fe72a1bca88677a91e9b95aa445b3b9266a16a (patch) | |
| tree | c63ac3ec9be2272f426c3354bf226a57a89424a4 | |
| parent | 92964aa4cc670503a64e3d776cde5254dcd82b1f (diff) | |
usb: dwc3: gadget: Fix setting of DEPCFG.bInterval_m1
commit a1679af85b2ae35a2b78ad04c18bb069c37330cc upstream.
Valid range for DEPCFG.bInterval_m1 is from 0 to 13, and it must be set
to 0 when the controller operates in full-speed. See the programming
guide for DEPCFG command section 3.2.2.1 (v3.30a).
Fixes: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/3f57026f993c0ce71498dbb06e49b3a47c4d0265.1612820995.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 5e015631413c..3a6427149738 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -521,7 +521,17 @@ static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep, params.param0 |= DWC3_DEPCFG_FIFO_NUMBER(dep->number >> 1); if (desc->bInterval) { - params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(desc->bInterval - 1); + u8 bInterval_m1; + + /* + * Valid range for DEPCFG.bInterval_m1 is from 0 to 13, and it + * must be set to 0 when the controller operates in full-speed. + */ + bInterval_m1 = min_t(u8, desc->bInterval - 1, 13); + if (dwc->gadget.speed == USB_SPEED_FULL) + bInterval_m1 = 0; + + params.param1 |= DWC3_DEPCFG_BINTERVAL_M1(bInterval_m1); dep->interval = 1 << (desc->bInterval - 1); } |