[PATCH 5.15 354/917] Bluetooth: hci_h5: Fix (runtime)suspend issues on RTL8723BS HCIs

Greg Kroah-Hartman
2021-11-15T23:37:01Z

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit 9a9023f314873241a43b5a2b96e9c0caaa958433 ]

The recently added H5_WAKEUP_DISABLE h5->flags flag gets checked in
h5_btrtl_open(), but it gets set in h5_serdev_probe() *after*
calling hci_uart_register_device() and thus after h5_btrtl_open()
is called, set this flag earlier.

Also on devices where suspend/resume involves fully re-probing the HCI,
runtime-pm suspend should not be used, make the runtime-pm setup
conditional on the H5_WAKEUP_DISABLE flag too.

This fixes the HCI being removed and then re-added every 10 seconds
because it was being reprobed as soon as it was runtime-suspended.

Fixes: 66f077dde749 ("Bluetooth: hci_h5: add WAKEUP_DISABLE flag")
Fixes: d9dd833cf6d2 ("Bluetooth: hci_h5: Add runtime suspend")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Archie Pusaka <apusaka@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/bluetooth/hci_h5.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index eb0099a212888..d49a39d17d7dc 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -848,6 +848,8 @@ static int h5_serdev_probe(struct serdev_device *serdev)
h5->vnd = data->vnd;
}

+ if (data->driver_info & H5_INFO_WAKEUP_DISABLE)
+ set_bit(H5_WAKEUP_DISABLE, &h5->flags);

h5->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(h5->enable_gpio))
@@ -862,9 +864,6 @@ static int h5_serdev_probe(struct serdev_device *serdev)
if (err)
return err;

- if (data->driver_info & H5_INFO_WAKEUP_DISABLE)
- set_bit(H5_WAKEUP_DISABLE, &h5->flags);
-
return 0;
}

@@ -964,11 +963,13 @@ static void h5_btrtl_open(struct h5 *h5)
serdev_device_set_parity(h5->hu->serdev, SERDEV_PARITY_EVEN);
serdev_device_set_baudrate(h5->hu->serdev, 115200);

- pm_runtime_set_active(&h5->hu->serdev->dev);
- pm_runtime_use_autosuspend(&h5->hu->serdev->dev);
- pm_runtime_set_autosuspend_delay(&h5->hu->serdev->dev,
- SUSPEND_TIMEOUT_MS);
- pm_runtime_enable(&h5->hu->serdev->dev);
+ if (!test_bit(H5_WAKEUP_DISABLE, &h5->flags)) {
+ pm_runtime_set_active(&h5->hu->serdev->dev);
+ pm_runtime_use_autosuspend(&h5->hu->serdev->dev);
+ pm_runtime_set_autosuspend_delay(&h5->hu->serdev->dev,
+ SUSPEND_TIMEOUT_MS);
+ pm_runtime_enable(&h5->hu->serdev->dev);
+ }

/* The controller needs up to 500ms to wakeup */
gpiod_set_value_cansleep(h5->enable_gpio, 1);
@@ -978,7 +979,8 @@ static void h5_btrtl_open(struct h5 *h5)

static void h5_btrtl_close(struct h5 *h5)
{
- pm_runtime_disable(&h5->hu->serdev->dev);
+ if (!test_bit(H5_WAKEUP_DISABLE, &h5->flags))
+ pm_runtime_disable(&h5->hu->serdev->dev);

gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
gpiod_set_value_cansleep(h5->enable_gpio, 0);
--
2.33.0