[PATCH v5 1/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390

[Zijun Hu <quic_zijuhu@xxxxxxxxxxx>]

Commit 56d074d26c58 ("Bluetooth: hci_qca: don't use IS_ERR_OR_NULL()
with gpiod_get_optional()") will cause below serious regression issue:

BT can't be enabled any more after below steps:
cold boot -> enable BT -> disable BT -> BT enable failure
if property enable-gpios is not configured within DT|ACPI for QCA_QCA6390.

The commit wrongly changes flag @power_ctrl_enabled set logic for this
case as shown by its below code applet and causes this serious issue.
qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
                                               GPIOD_OUT_LOW);
- if (IS_ERR_OR_NULL(qcadev->bt_en)) {
+ if (IS_ERR(qcadev->bt_en)) {
  	dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
	power_ctrl_enabled = false;
  }

Fixed by reverting the mentioned commit for QCA_QCA6390.

Fixes: 56d074d26c58 ("Bluetooth: hci_qca: don't use IS_ERR_OR_NULL() with gpiod_get_optional()")
Reported-by: Wren Turkal <wt@xxxxxxxxxxxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218726
Link: https://lore.kernel.org/linux-bluetooth/ea20bb9b-6b60-47fc-ae42-5eed918ad7b4@xxxxxxxxxxx/T/#m73d6a71d2f454bb03588c66f3ef7912274d37c6f
Signed-off-by: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
Tested-by: Wren Turkal <wt@xxxxxxxxxxxxxxxx>
---
 drivers/bluetooth/hci_qca.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 92fa20f5ac7d..4079254fb1c8 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -2357,6 +2357,8 @@ static int qca_serdev_probe(struct serdev_device *serdev)
 		if (IS_ERR(qcadev->bt_en)) {
 			dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
 			power_ctrl_enabled = false;
+		} else if (!qcadev->bt_en && qcadev->btsoc_type == QCA_QCA6390) {
+			power_ctrl_enabled = false;
 		}
 
 		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
-- 
2.7.4