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From: Zijun Hu <quic_zijuhu@quicinc.com>
To: <luiz.dentz@gmail.com>, <luiz.von.dentz@intel.com>, <marcel@holtmann.org>
CC: <quic_zijuhu@quicinc.com>, <linux-bluetooth@vger.kernel.org>,
        <bartosz.golaszewski@linaro.org>, <krzysztof.kozlowski@linaro.org>,
        <wt@penguintechs.org>, <regressions@lists.linux.dev>
Subject: [PATCH v5 1/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390
Date: Mon, 22 Apr 2024 15:38:16 +0800
Message-ID: <1713771497-5733-2-git-send-email-quic_zijuhu@quicinc.com>
In-Reply-To: <1713771497-5733-1-git-send-email-quic_zijuhu@quicinc.com>
References: <1713650800-29741-1-git-send-email-quic_zijuhu@quicinc.com>
 <1713771497-5733-1-git-send-email-quic_zijuhu@quicinc.com>
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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@penguintechs.org>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218726
Link: https://lore.kernel.org/linux-bluetooth/ea20bb9b-6b60-47fc-ae42-5eed918ad7b4@quicinc.com/T/#m73d6a71d2f454bb03588c66f3ef7912274d37c6f
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Tested-by: Wren Turkal <wt@penguintechs.org>
---
 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