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| author | Thinh Nguyen <Thinh.Nguyen@synopsys.com> | 2021-01-20 04:36:14 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-06 16:21:21 +0300 |
| commit | 52c2d15703c3a900d5f78cd599b823db40d5100b (patch) | |
| tree | c5dceb701423f894c87246d49aafba1ec5c1fce5 /include/linux/usb | |
| parent | de4d9ea789530ac0ce3409878422e9389c3a7cd3 (diff) | |
| download | linux-52c2d15703c3a900d5f78cd599b823db40d5100b.tar.xz | |
usb: common: Parse for USB SSP genXxY
The USB "maximum-speed" property can now take the SSP signaling rate
generation and lane count with these new strings:
"super-speed-plus-gen2x2"
"super-speed-plus-gen2x1"
"super-speed-plus-gen1x2"
Introduce usb_get_maximum_ssp_rate() to parse for the corresponding
usb_ssp_rate enum. The original usb_get_maximum_speed() will return
USB_SPEED_SUPER_PLUS if it matches one of these new strings.
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/f8ed896313d8cd8e2d2b540fc82db92b3ddf8a47.1611106162.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/usb')
| -rw-r--r-- | include/linux/usb/ch9.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h index 86c50907634e..abdd310c77f0 100644 --- a/include/linux/usb/ch9.h +++ b/include/linux/usb/ch9.h @@ -72,6 +72,17 @@ extern const char *usb_speed_string(enum usb_device_speed speed); extern enum usb_device_speed usb_get_maximum_speed(struct device *dev); /** + * usb_get_maximum_ssp_rate - Get the signaling rate generation and lane count + * of a SuperSpeed Plus capable device. + * @dev: Pointer to the given USB controller device + * + * If the string from "maximum-speed" property is super-speed-plus-genXxY where + * 'X' is the generation number and 'Y' is the number of lanes, then this + * function returns the corresponding enum usb_ssp_rate. + */ +extern enum usb_ssp_rate usb_get_maximum_ssp_rate(struct device *dev); + +/** * usb_state_string - Returns human readable name for the state. * @state: The state to return a human-readable name for. If it's not * any of the states devices in usb_device_state_string enum, |