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-rw-r--r--drivers/thunderbolt/lc.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/thunderbolt/lc.c b/drivers/thunderbolt/lc.c
index a5dddf176546..ae1e92611c3e 100644
--- a/drivers/thunderbolt/lc.c
+++ b/drivers/thunderbolt/lc.c
@@ -133,3 +133,47 @@ void tb_lc_unconfigure_link(struct tb_switch *sw)
tb_lc_configure_lane(up, false);
tb_lc_configure_lane(down, false);
}
+
+/**
+ * tb_lc_set_sleep() - Inform LC that the switch is going to sleep
+ * @sw: Switch to set sleep
+ *
+ * Let the switch link controllers know that the switch is going to
+ * sleep.
+ */
+int tb_lc_set_sleep(struct tb_switch *sw)
+{
+ int start, size, nlc, ret, i;
+ u32 desc;
+
+ if (sw->generation < 2)
+ return 0;
+
+ ret = read_lc_desc(sw, &desc);
+ if (ret)
+ return ret;
+
+ /* Figure out number of link controllers */
+ nlc = desc & TB_LC_DESC_NLC_MASK;
+ start = (desc & TB_LC_DESC_SIZE_MASK) >> TB_LC_DESC_SIZE_SHIFT;
+ size = (desc & TB_LC_DESC_PORT_SIZE_MASK) >> TB_LC_DESC_PORT_SIZE_SHIFT;
+
+ /* For each link controller set sleep bit */
+ for (i = 0; i < nlc; i++) {
+ unsigned int offset = sw->cap_lc + start + i * size;
+ u32 ctrl;
+
+ ret = tb_sw_read(sw, &ctrl, TB_CFG_SWITCH,
+ offset + TB_LC_SX_CTRL, 1);
+ if (ret)
+ return ret;
+
+ ctrl |= TB_LC_SX_CTRL_SLP;
+ ret = tb_sw_write(sw, &ctrl, TB_CFG_SWITCH,
+ offset + TB_LC_SX_CTRL, 1);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}