xHCI: BESL calculation based on USB2.0 LPM errata

The latest released errata for USB2.0 ECN LPM adds new fields to USB2.0
extension descriptor, defines two BESL values for device: baseline BESL
and deep BESL. Baseline BESL value communicates a nominal power savings
design point and the deep BESL value communicates a significant power
savings design point.

If device indicates BESL value, driver will use a value count in both
host BESL and device BESL. Use baseline BESL value as default.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Tested-by: Jason Fan <jcfan@qca.qualcomm.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index 3b6f628880f8..af21f3115919 100644
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -789,6 +789,11 @@ struct usb_ext_cap_descriptor {		/* Link Power Management */
         __u8  bDevCapabilityType;
         __le32 bmAttributes;
 #define USB_LPM_SUPPORT                 (1 << 1)        /* supports LPM */
+#define USB_BESL_SUPPORT                (1 << 2)        /* supports BESL */
+#define USB_BESL_BASELINE_VALID         (1 << 3)        /* Baseline BESL valid*/
+#define USB_BESL_DEEP_VALID             (1 << 4)        /* Deep BESL valid */
+#define USB_GET_BESL_BASELINE(p)        (((p) & (0xf << 8)) >> 8)
+#define USB_GET_BESL_DEEP(p)            (((p) & (0xf << 12)) >> 12)
 } __attribute__((packed));
 
 #define USB_DT_USB_EXT_CAP_SIZE 7