usb: xhci: add USB2 Link power management BESL support

[karo-tx-linux.git] / drivers / usb / host / xhci.h

diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 01325710424c96d7e3f4a78c53f6215aa2bfde7d..c306849eb299027ca2cb75faacb8d795362ae7fd 100644 (file)
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -386,6 +386,27 @@ struct xhci_op_regs {
 #define        PORT_L1DS(p)            (((p) & 0xff) << 8)
 #define        PORT_HLE                (1 << 16)
 
+
+/* USB2 Protocol PORTHLPMC */
+#define PORT_HIRDM(p)((p) & 3)
+#define PORT_L1_TIMEOUT(p)(((p) & 0xff) << 2)
+#define PORT_BESLD(p)(((p) & 0xf) << 10)
+
+/* use 512 microseconds as USB2 LPM L1 default timeout. */
+#define XHCI_L1_TIMEOUT                512
+
+/* Set default HIRD/BESL value to 4 (350/400us) for USB2 L1 LPM resume latency.
+ * Safe to use with mixed HIRD and BESL systems (host and device) and is used
+ * by other operating systems.
+ *
+ * XHCI 1.0 errata 8/14/12 Table 13 notes:
+ * "Software should choose xHC BESL/BESLD field values that do not violate a
+ * device's resume latency requirements,
+ * e.g. not program values > '4' if BLC = '1' and a HIRD device is attached,
+ * or not program values < '4' if BLC = '0' and a BESL device is attached.
+ */
+#define XHCI_DEFAULT_BESL      4
+
 /**
  * struct xhci_intr_reg - Interrupt Register Set
  * @irq_pending:       IMAN - Interrupt Management Register.  Used to enable