diff options
| author | Gil Fine <gil.fine@intel.com> | 2021-12-17 04:16:43 +0300 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2021-12-28 10:43:56 +0300 |
| commit | 43f977bc60b1cfd3c1d220a9a0a06493fbf3985d (patch) | |
| tree | e1dd6423c1c4b1e0defc5454a90f09f041a2b105 /drivers/thunderbolt/lc.c | |
| parent | 483c9d8275aff428df433e9d7c718609345500e2 (diff) | |
| download | linux-43f977bc60b1cfd3c1d220a9a0a06493fbf3985d.tar.xz | |
thunderbolt: Enable CL0s for Intel Titan Ridge
Low power link states (called collectively CLx) are used to reduce
transmitter and receiver power when a high-speed lane is idle. The
simplest one being called CL0s. Follow what we already do for USB4
device routers and enable CL0s for Intel Titan Ridge device router too.
This allows better thermal management.
Signed-off-by: Gil Fine <gil.fine@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/lc.c')
| -rw-r--r-- | drivers/thunderbolt/lc.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/thunderbolt/lc.c b/drivers/thunderbolt/lc.c index c178f0d7beab..53495a38b4eb 100644 --- a/drivers/thunderbolt/lc.c +++ b/drivers/thunderbolt/lc.c @@ -193,6 +193,30 @@ int tb_lc_start_lane_initialization(struct tb_port *port) return tb_sw_write(sw, &ctrl, TB_CFG_SWITCH, cap + TB_LC_SX_CTRL, 1); } +/** + * tb_lc_is_clx_supported() - Check whether CLx is supported by the lane adapter + * @port: Lane adapter + * + * TB_LC_LINK_ATTR_CPS bit reflects if the link supports CLx including + * active cables (if connected on the link). + */ +bool tb_lc_is_clx_supported(struct tb_port *port) +{ + struct tb_switch *sw = port->sw; + int cap, ret; + u32 val; + + cap = find_port_lc_cap(port); + if (cap < 0) + return false; + + ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, cap + TB_LC_LINK_ATTR, 1); + if (ret) + return false; + + return !!(val & TB_LC_LINK_ATTR_CPS); +} + static int tb_lc_set_wake_one(struct tb_switch *sw, unsigned int offset, unsigned int flags) { |