linux-kernel - [PATCH 04/12] thunderbolt: Keep the parent runtime resumed for a while on device disconnect

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Message-Id: <20201119155523.41332-5-mika.westerberg@linux.intel.com>
Date:   Thu, 19 Nov 2020 18:55:15 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     Yehezkel Bernat <YehezkelShB@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Andreas Noever <andreas.noever@...il.com>,
        Lukas Wunner <lukas@...ner.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 04/12] thunderbolt: Keep the parent runtime resumed for a while on device disconnect

When doing device firmware upgrade the device will disconnect for a
while and then reconnect back. Keep the parent device (and the whole
domain) powered for a while so we don't need to runtime resume
immediately when the device is connected back after the device upgrade
completes.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/thunderbolt/icm.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/thunderbolt/icm.c b/drivers/thunderbolt/icm.c
index beee6e6b8b6e..635b949fb1d6 100644
--- a/drivers/thunderbolt/icm.c
+++ b/drivers/thunderbolt/icm.c
@@ -870,7 +870,13 @@ icm_fr_device_disconnected(struct tb *tb, const struct icm_pkg_header *hdr)
 		return;
 	}
 
+	pm_runtime_get_sync(sw->dev.parent);
+
 	remove_switch(sw);
+
+	pm_runtime_mark_last_busy(sw->dev.parent);
+	pm_runtime_put_autosuspend(sw->dev.parent);
+
 	tb_switch_put(sw);
 }
 
@@ -1280,8 +1286,13 @@ icm_tr_device_disconnected(struct tb *tb, const struct icm_pkg_header *hdr)
 		tb_warn(tb, "no switch exists at %llx, ignoring\n", route);
 		return;
 	}
+	pm_runtime_get_sync(sw->dev.parent);
 
 	remove_switch(sw);
+
+	pm_runtime_mark_last_busy(sw->dev.parent);
+	pm_runtime_put_autosuspend(sw->dev.parent);
+
 	tb_switch_put(sw);
 }
 
-- 
2.29.2