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thunderbolt: Change downstream router's TMU rate in both TMU uni/bidir mode

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In case of uni-directional time sync, TMU handshake is
initiated by upstream router. In case of bi-directional
time sync, TMU handshake is initiated by downstream router.
In order to handle correctly the case of uni-directional mode,
we avoid changing the upstream router's rate to off,
because it might have another downstream router plugged that is set to
uni-directional mode (and we don't want to change its mode).
Instead, we always change downstream router's rate.

Signed-off-by: Gil Fine <gil.fine@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Gil Fine 2022-05-26 13:59:19 +03:00 committed by Mika Westerberg
parent b4e08d5d08
commit 5fd6b9a5cb
1 changed files with 7 additions and 6 deletions
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13
drivers/thunderbolt/tmu.c
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@ -359,13 +359,14 @@ int tb_switch_tmu_disable(struct tb_switch *sw)
* In case of uni-directional time sync, TMU handshake is
* initiated by upstream router. In case of bi-directional
* time sync, TMU handshake is initiated by downstream router.
* Therefore, we change the rate to off in the respective
* router.
* We change downstream router's rate to off for both uni/bidir
* cases although it is needed only for the bi-directional mode.
* We avoid changing upstream router's mode since it might
* have another downstream router plugged, that is set to
* uni-directional mode and we don't want to change it's TMU
* mode.
*/
if (unidirectional)
tb_switch_tmu_rate_write(parent, TB_SWITCH_TMU_RATE_OFF);
else
tb_switch_tmu_rate_write(sw, TB_SWITCH_TMU_RATE_OFF);
tb_switch_tmu_rate_write(sw, TB_SWITCH_TMU_RATE_OFF);
tb_port_tmu_time_sync_disable(up);
ret = tb_port_tmu_time_sync_disable(down);