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According to USB4 specification, if E2E flow control is disabled for the Transmit Descriptor Ring, the Host Interface Adapter Layer shall not require any credits to be available before transmitting a Tunneled Packet from this Transmit Descriptor Ring, so e2e flow control should be enabled in both directions. Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Link: https://lore.kernel.org/20250624153805.GC2824380@black.fi.intel.com Signed-off-by: zhangjianrong <zhangjianrong5@huawei.com> Link: https://patch.msgid.link/20250628093813.647005-1-zhangjianrong5@huawei.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>