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.h | |
| 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.h')
| -rw-r--r-- | drivers/usb/dwc3/core.h | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 2fa768637f49..92045efefaab 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -800,8 +800,7 @@ struct dwc3_scratchpad_array { * @u2pel: parameter from Set SEL request. * @u1sel: parameter from Set SEL request. * @u1pel: parameter from Set SEL request. - * @num_out_eps: number of out endpoints - * @num_in_eps: number of in endpoints + * @num_eps: number of endpoints * @ep0_next_event: hold the next expected event * @ep0state: state of endpoint zero * @link_state: link state @@ -961,8 +960,7 @@ struct dwc3 { u8 speed; - u8 num_out_eps; - u8 num_in_eps; + u8 num_eps; struct dwc3_hwparams hwparams; struct dentry *root; |