- DWC_USB3_NUM indicates the number of Device mode single directional
endpoints, including OUT and IN endpoint 0.
- DWC_USB3_NUM_IN_EPS indicates the maximum number of Device mode IN
endpoints active at any time, including control endpoint 0.
It's possible to configure RTL such that DWC_USB3_NUM_EPS is equal to
DWC_USB3_NUM_IN_EPS.
dwc3-core calculates the number of OUT endpoints as DWC_USB3_NUM minus
DWC_USB3_NUM_IN_EPS. If RTL has been configured with DWC_USB3_NUM_IN_EPS
equal to DWC_USB3_NUM then dwc3-core will calculate the number of OUT
endpoints as zero.
For example a from dwc3_core_num_eps() shows:
[ 1.565000] /usb0@f01d0000: found 8 IN and 0 OUT endpoints
This patch works around this case by detecting when DWC_USB3_NUM_EPS is
equal to DWC3_USB3_NUM_IN_EPS and over-rides the calculation of the number
of OUT and IN endpoints to make dwc->num_in_eps equal to half
DWC_USB3_NUM_EPS.
If DWC_USB3_NUM_EPS is equal to DWC3_USB3_NUM_IN_EPS and the endpoint count
is an odd number then dwc->num_out_eps will be assigned the extra endpoint.
Suggested-by: Felipe Balbi <ba...@kernel.org>
Signed-off-by: Bryan O'Donoghue <pure.lo...@nexus-software.ie>
---
drivers/usb/dwc3/core.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 369bab1..91f0d9c 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -398,7 +398,12 @@ static void dwc3_core_num_eps(struct dwc3 *dwc)
struct dwc3_hwparams *parms = &dwc->hwparams;
dwc->num_in_eps = DWC3_NUM_IN_EPS(parms);
- dwc->num_out_eps = DWC3_NUM_EPS(parms) - dwc->num_in_eps;
+ dwc->num_out_eps = DWC3_NUM_EPS(parms);
+
+ if (dwc->num_in_eps == dwc->num_out_eps)
+ dwc->num_in_eps = dwc->num_out_eps / 2;
+
+ dwc->num_out_eps -= dwc->num_in_eps;
}
static void dwc3_cache_hwparams(struct dwc3 *dwc)
--
2.7.4
--
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