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thunderbolt: Check that lane 1 is in CL0 before enabling lane bonding
Marek reported that when BlackMagic UltraStudio device is connected the kernel repeatedly tries to enable lane bonding without success making the device non-functional. It looks like the device does not have lane 1 connected at all so even though it is enabled we should not try to bond the lanes. For this reason check that lane 1 is in fact CL0 (connected, active) before attempting to bond the lanes. Reported-by: Marek Šanta <teslan223@gmail.com> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217737 Cc: stable@vger.kernel.org Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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@ -2725,6 +2725,13 @@ int tb_switch_lane_bonding_enable(struct tb_switch *sw)
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!tb_port_is_width_supported(down, TB_LINK_WIDTH_DUAL))
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return 0;
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/*
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* Both lanes need to be in CL0. Here we assume lane 0 already be in
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* CL0 and check just for lane 1.
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*/
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if (tb_wait_for_port(down->dual_link_port, false) <= 0)
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return -ENOTCONN;
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ret = tb_port_lane_bonding_enable(up);
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if (ret) {
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tb_port_warn(up, "failed to enable lane bonding\n");
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