thunderbolt: Add support for authenticate on disconnect

Some external devices can support completing thunderbolt authentication
when they are unplugged. For this to work though, the link controller must
remain operational.

The only device known to support this right now is the Dell WD19TB, so add
a quirk for this.

Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/thunderbolt/quirks.c b/drivers/thunderbolt/quirks.c
new file mode 100644
index 000000000000..0525f59220ae
--- /dev/null
+++ b/drivers/thunderbolt/quirks.c
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Thunderbolt driver - quirks
+ *
+ * Copyright (c) 2020 Mario Limonciello <mario.limonciello@dell.com>
+ */
+
+#include "tb.h"
+
+static void quirk_force_power_link(struct tb_switch *sw)
+{
+	sw->quirks |= QUIRK_FORCE_POWER_LINK_CONTROLLER;
+}
+
+struct tb_quirk {
+	u16 vendor;
+	u16 device;
+	void (*hook)(struct tb_switch *sw);
+};
+
+const static struct tb_quirk tb_quirks[] = {
+	/* Dell WD19TB supports self-authentication on unplug */
+	{ 0x00d4, 0xb070, quirk_force_power_link },
+};
+
+/**
+ * tb_check_quirks() - Check for quirks to apply
+ * @sw: Thunderbolt switch
+ *
+ *  Apply any quirks for the Thunderbolt controller
+ */
+void tb_check_quirks(struct tb_switch *sw)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(tb_quirks); i++) {
+		const struct tb_quirk *q = &tb_quirks[i];
+
+		if (sw->device == q->device && sw->vendor == q->vendor)
+			q->hook(sw);
+	}
+}