diff options
| author | Ian Moffett <ian@osmora.org> | 2025-10-11 19:02:45 -0400 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2025-10-11 19:02:45 -0400 |
| commit | 0552d8126be3f2ea9f03098afb5cb77049c8d606 (patch) | |
| tree | 28f3392944b63e5c332a259cd85e9bf7a38acd24 /src/sys/include/io | |
| parent | 3fdef4036ebde968f13567288fa96d79e9670611 (diff) | |
kern: usb: Poll USBSTS.CNR after reset
The host needs to wait for the controller to be ready by polling the CNR
bit as per section 4.2 of the spec
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'src/sys/include/io')
| -rw-r--r-- | src/sys/include/io/usb/xhciregs.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/sys/include/io/usb/xhciregs.h b/src/sys/include/io/usb/xhciregs.h index ebaf5d7..85a8630 100644 --- a/src/sys/include/io/usb/xhciregs.h +++ b/src/sys/include/io/usb/xhciregs.h @@ -77,6 +77,12 @@ struct __packed xhci_opregs { */ #define USBCMD_HCRST BIT(1) /* Host controller reset */ +/* + * USB status register bits + * + * See section 5.4.2 of the xHCI spec + */ +#define USBSTS_CNR BIT(11) /* Controller not ready */ /* * Macros to get various register spaces |