diff options
| author | Gil Fine <gil.fine@intel.com> | 2022-05-26 13:59:21 +0300 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2022-06-06 12:24:56 +0300 |
| commit | 3084b48fa13931400f316e2b9ffdd98b8ba6600e (patch) | |
| tree | 87e88f0bcdef11a68e04d8e440d4e8561758688b /drivers/thunderbolt/tb.c | |
| parent | b017a46d486cd4113b1856f3fd611f54cd0f9c03 (diff) | |
| download | linux-3084b48fa13931400f316e2b9ffdd98b8ba6600e.tar.bz2 | |
thunderbolt: Change TMU mode to HiFi uni-directional once DisplayPort tunneled
Here we configure TMU mode to HiFi uni-directional once DP tunnel
is created. This is due to accuracy requirement for DP tunneling
as appears in CM guide 1.0, section 7.3.2.
Due to Intel hardware limitation, once we changed the TMU mode to HiFi
uni-directional (when DP tunnel exists), we don't change TMU mode back to
normal uni-directional, even if DP tunnel is torn down later.
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 | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 8e9fdc4e0650..9853f6c7e81d 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -118,6 +118,13 @@ static void tb_switch_discover_tunnels(struct tb_switch *sw, switch (port->config.type) { case TB_TYPE_DP_HDMI_IN: tunnel = tb_tunnel_discover_dp(tb, port, alloc_hopids); + /* + * In case of DP tunnel exists, change host router's + * 1st children TMU mode to HiFi for CL0s to work. + */ + if (tunnel) + tb_switch_enable_tmu_1st_child(tb->root_switch, + TB_SWITCH_TMU_RATE_HIFI); break; case TB_TYPE_PCIE_DOWN: @@ -979,6 +986,12 @@ static void tb_tunnel_dp(struct tb *tb) list_add_tail(&tunnel->list, &tcm->tunnel_list); tb_reclaim_usb3_bandwidth(tb, in, out); + /* + * In case of DP tunnel exists, change host router's 1st children + * TMU mode to HiFi for CL0s to work. + */ + tb_switch_enable_tmu_1st_child(tb->root_switch, TB_SWITCH_TMU_RATE_HIFI); + return; err_free: |