This is a note to let you know that I've just added the patch titled usb: dwc3: gadget: Fix setting of DEPCFG.bInterval_m1 to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-testing branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will be merged to the usb-next branch sometime soon, after it passes testing, and the merge window is open. If you have any questions about this process, please let me know. >From a1679af85b2ae35a2b78ad04c18bb069c37330cc Mon Sep 17 00:00:00 2001 From: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> Date: Mon, 8 Feb 2021 13:53:10 -0800 Subject: usb: dwc3: gadget: Fix setting of DEPCFG.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. See the programming guide for DEPCFG command section 3.2.2.1 (v3.30a). Fixes: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver") Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/3f57026f993c0ce71498dbb06e49b3a47c4d0265.1612820995.git.Thinh.Nguyen@xxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/dwc3/gadget.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 97d707b4f384..d0f8d3ec855f 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -605,7 +605,17 @@ static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action) 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); } -- 2.30.0