diff options
| author | Gil Fine <gil.fine@intel.com> | 2021-12-17 04:16:39 +0300 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2021-12-22 17:13:14 +0300 |
| commit | 8a90e4fa3b4d6a10c96b0a04abf57bb5a16a8f4e (patch) | |
| tree | 6c827d6d67aa7d5250f9d06dc59457493a5a1ca4 /drivers/thunderbolt/tb.c | |
| parent | a28ec0e165ba2f90568828a2578aaa8540e13bc5 (diff) | |
| download | linux-8a90e4fa3b4d6a10c96b0a04abf57bb5a16a8f4e.tar.xz | |
thunderbolt: Add CL0s support for USB4 routers
In this patch we add enabling of CL0s - a low power state of the link.
Low power states (called collectively CLx) are used to reduce
transmitter and receiver power when a high-speed lane is idle. For now,
we add support only for first low power state: CL0s. We enable it, if
both sides of the link support it, and only for the first hop router.
(i.e. the first device that connected to the host router). This is
needed for 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/tb.c')
| -rw-r--r-- | drivers/thunderbolt/tb.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 7ed02d86eabd..1454dc5b6b91 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -669,7 +669,11 @@ static void tb_scan_port(struct tb_port *port) tb_switch_lane_bonding_enable(sw); /* Set the link configured */ tb_switch_configure_link(sw); - tb_switch_tmu_configure(sw, TB_SWITCH_TMU_RATE_HIFI, false); + if (tb_switch_enable_clx(sw, TB_CL0S)) + tb_sw_warn(sw, "failed to enable CLx on upstream port\n"); + + tb_switch_tmu_configure(sw, TB_SWITCH_TMU_RATE_HIFI, + tb_switch_is_clx_enabled(sw)); if (tb_enable_tmu(sw)) tb_sw_warn(sw, "failed to enable TMU\n"); @@ -1420,6 +1424,9 @@ static void tb_restore_children(struct tb_switch *sw) if (sw->is_unplugged) return; + if (tb_switch_enable_clx(sw, TB_CL0S)) + tb_sw_warn(sw, "failed to re-enable CLx on upstream port\n"); + /* * tb_switch_tmu_configure() was already called when the switch was * added before entering system sleep or runtime suspend, |