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usb: dwc3: gadget: Remove FS bInterval_m1 limitation 

The programming guide incorrectly stated that the DCFG.bInterval_m1 must
be set to 0 when operating in fullspeed. There's no such limitation for
all IPs. See DWC_usb3x programming guide section 3.2.2.1.

Fixes: a1679af85b ("usb: dwc3: gadget: Fix setting of DEPCFG.bInterval_m1")
Cc: <stable@vger.kernel.org>
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/5d4139ae89d810eb0a2d8577fb096fc88e87bfab.1618472454.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thinh Nguyen 2021-04-15 00:41:58 -07:00 committed by Greg Kroah-Hartman
parent 5951b7c20f
commit 3232a3ce55
1 changed files with 6 additions and 4 deletions
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10
drivers/usb/dwc3/gadget.c
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@ -607,12 +607,14 @@ static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep, unsigned int action)
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.
* Valid range for DEPCFG.bInterval_m1 is from 0 to 13.
*
* NOTE: The programming guide incorrectly stated bInterval_m1
* must be set to 0 when operating in fullspeed. Internally the
* controller does not have this limitation. See DWC_usb3x
* programming guide section 3.2.2.1.
*/
bInterval_m1 = min_t(u8, desc->bInterval - 1, 13);
if (dwc->gadget->speed == USB_SPEED_FULL)
bInterval_m1 = 0;
if (usb_endpoint_type(desc) == USB_ENDPOINT_XFER_INT &&
dwc->gadget->speed == USB_SPEED_FULL)