6.6-stable review patch. If anyone has any objections, please let me know.
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From: Gil Fine gil.fine@linux.intel.com
commit 3cea8af2d1a9ae5869b47c3dabe3b20f331f3bbd upstream.
Currently, when configuring TMU (Time Management Unit) mode of a given router, we take into account only its own TMU requirements ignoring other routers in the domain. This is problematic if the router we are configuring has lower TMU requirements than what is already configured in the domain.
In the scenario below, we have a host router with two USB4 ports: A and B. Port A connected to device router #1 (which supports CL states) and existing DisplayPort tunnel, thus, the TMU mode is HiFi uni-directional.
1. Initial topology
[Host] A/ / [Device #1] / Monitor
2. Plug in device #2 (that supports CL states) to downstream port B of the host router
[Host] A/ B\ / \ [Device #1] [Device #2] / Monitor
The TMU mode on port B and port A will be configured to LowRes which is not what we want and will cause monitor to start flickering.
To address this we first scan the domain and search for any router configured to HiFi uni-directional mode, and if found, configure TMU mode of the given router to HiFi uni-directional as well.
Cc: stable@vger.kernel.org Signed-off-by: Gil Fine gil.fine@linux.intel.com Signed-off-by: Mika Westerberg mika.westerberg@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/thunderbolt/tb.c | 48 +++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 42 insertions(+), 6 deletions(-)
--- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -383,6 +383,24 @@ static void tb_increase_tmu_accuracy(str device_for_each_child(&sw->dev, NULL, tb_increase_switch_tmu_accuracy); }
+static int tb_switch_tmu_hifi_uni_required(struct device *dev, void *not_used) +{ + struct tb_switch *sw = tb_to_switch(dev); + + if (sw && tb_switch_tmu_is_enabled(sw) && + tb_switch_tmu_is_configured(sw, TB_SWITCH_TMU_MODE_HIFI_UNI)) + return 1; + + return device_for_each_child(dev, NULL, + tb_switch_tmu_hifi_uni_required); +} + +static bool tb_tmu_hifi_uni_required(struct tb *tb) +{ + return device_for_each_child(&tb->dev, NULL, + tb_switch_tmu_hifi_uni_required) == 1; +} + static int tb_enable_tmu(struct tb_switch *sw) { int ret; @@ -397,12 +415,30 @@ static int tb_enable_tmu(struct tb_switc ret = tb_switch_tmu_configure(sw, TB_SWITCH_TMU_MODE_MEDRES_ENHANCED_UNI); if (ret == -EOPNOTSUPP) { - if (tb_switch_clx_is_enabled(sw, TB_CL1)) - ret = tb_switch_tmu_configure(sw, - TB_SWITCH_TMU_MODE_LOWRES); - else - ret = tb_switch_tmu_configure(sw, - TB_SWITCH_TMU_MODE_HIFI_BI); + if (tb_switch_clx_is_enabled(sw, TB_CL1)) { + /* + * Figure out uni-directional HiFi TMU requirements + * currently in the domain. If there are no + * uni-directional HiFi requirements we can put the TMU + * into LowRes mode. + * + * Deliberately skip bi-directional HiFi links + * as these work independently of other links + * (and they do not allow any CL states anyway). + */ + if (tb_tmu_hifi_uni_required(sw->tb)) + ret = tb_switch_tmu_configure(sw, + TB_SWITCH_TMU_MODE_HIFI_UNI); + else + ret = tb_switch_tmu_configure(sw, + TB_SWITCH_TMU_MODE_LOWRES); + } else { + ret = tb_switch_tmu_configure(sw, TB_SWITCH_TMU_MODE_HIFI_BI); + } + + /* If not supported, fallback to bi-directional HiFi */ + if (ret == -EOPNOTSUPP) + ret = tb_switch_tmu_configure(sw, TB_SWITCH_TMU_MODE_HIFI_BI); } if (ret) return ret;