diff options
| author | Bryan O'Donoghue <pure.logic@nexus-software.ie> | 2017-01-31 20:58:10 +0000 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-04-11 10:58:18 +0300 |
| commit | 47d3946ea220f2db43b3abc46c9e64287d625ac3 (patch) | |
| tree | c074a4bbc17069cabe8db2b84fa91238cc3d04fd /drivers/usb/dwc3/core.c | |
| parent | 8261bd4e91e26d12c1ade9f94dae51629157c18b (diff) | |
usb: dwc3: refactor gadget endpoint count calculation
- 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 refactors the endpoint calculation down to one variable
dwc->num_eps taking care to maintain the current mapping of endpoints for
fixed FPGA configurations as described in Table 4-7 of version 2.60a of the
DWC USB3 databook.
The endpoint mapping will then be EP-OUT, EP-IN etc, up to DWC_USB3_NUM.
If DWC_USB3_NUM is odd then OUT will take the extra endpoint.
Suggested-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc3/core.c')
| -rw-r--r-- | drivers/usb/dwc3/core.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 8173d0634d68..56f136784cd3 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -397,8 +397,7 @@ 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_eps = DWC3_NUM_EPS(parms); } static void dwc3_cache_hwparams(struct dwc3 *dwc) |