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Bluetooth: hci_bcm: Handle deferred probing for the clock supply

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[ Upstream commit 28ac03b9ac3f784c2f048a910c8d0a7a87483b66 ]

On some systems that actually have the bluetooth controller wired up
with an extra clock signal, it's possible the bluetooth controller
probes before the clock provider. clk_get would return a defer probe
error, which was not handled by this driver.

Handle this properly, so that these systems can work reliably.

Tested-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chen-Yu Tsai 2018-12-17 12:04:39 +08:00 committed by Greg Kroah-Hartman
parent 1baca23ade
commit 38f18b3705
1 changed files with 4 additions and 0 deletions
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4
drivers/bluetooth/hci_bcm.c
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@ -907,6 +907,10 @@ static int bcm_get_resources(struct bcm_device *dev)
dev->clk = devm_clk_get(dev->dev, NULL);
/* Handle deferred probing */
if (dev->clk == ERR_PTR(-EPROBE_DEFER))
return PTR_ERR(dev->clk);
dev->device_wakeup = devm_gpiod_get_optional(dev->dev, "device-wakeup",
GPIOD_OUT_LOW);
if (IS_ERR(dev->device_wakeup))