diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-27 10:32:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-27 10:32:30 +0300 |
| commit | f6402eb4a2b3192bdf23fa39ef8e85fd3691cca9 (patch) | |
| tree | da8d55cd97d59cfe689fe447d98637204f2218e3 /drivers/usb/early/xhci-dbc.h | |
| parent | 992a60ed0d5e312ce9a485c9e12097ac82ae4b3e (diff) | |
| parent | 6a8b55ed4056ea5559ebe4f6a4b247f627870d4c (diff) | |
| download | linux-f6402eb4a2b3192bdf23fa39ef8e85fd3691cca9.tar.xz | |
Merge 5.7-rc3 into usb-next
We need the USB fixes in here too.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/early/xhci-dbc.h')
| -rw-r--r-- | drivers/usb/early/xhci-dbc.h | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/usb/early/xhci-dbc.h b/drivers/usb/early/xhci-dbc.h index 9fb6a9f2548a..8b4d71de45fc 100644 --- a/drivers/usb/early/xhci-dbc.h +++ b/drivers/usb/early/xhci-dbc.h @@ -120,8 +120,22 @@ struct xdbc_ring { u32 cycle_state; }; -#define XDBC_EPID_OUT 2 -#define XDBC_EPID_IN 3 +/* + * These are the "Endpoint ID" (also known as "Context Index") values for the + * OUT Transfer Ring and the IN Transfer Ring of a Debug Capability Context data + * structure. + * According to the "eXtensible Host Controller Interface for Universal Serial + * Bus (xHCI)" specification, section "7.6.3.2 Endpoint Contexts and Transfer + * Rings", these should be 0 and 1, and those are the values AMD machines give + * you; but Intel machines seem to use the formula from section "4.5.1 Device + * Context Index", which is supposed to be used for the Device Context only. + * Luckily the values from Intel don't overlap with those from AMD, so we can + * just test for both. + */ +#define XDBC_EPID_OUT 0 +#define XDBC_EPID_IN 1 +#define XDBC_EPID_OUT_INTEL 2 +#define XDBC_EPID_IN_INTEL 3 struct xdbc_state { u16 vendor; |