linux-kernel - Re: [PATCH] Bluetooth: qca: set power_ctrl_enabled on NULL returned by gpiod_get

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Date: Wed, 24 Apr 2024 05:04:02 -0400
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Wren Turkal <wt@...guintechs.org>
Cc: linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, Zijun Hu <quic_zijuhu@...cinc.com>, 
	Bartosz Golaszewski <brgl@...ev.pl>, Marcel Holtmann <marcel@...tmann.org>, 
	Luiz Augusto von Dentz <luiz.dentz@...il.com>, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH] Bluetooth: qca: set power_ctrl_enabled on NULL returned
 by gpiod_get_optional()

On Wed, 24 Apr 2024 07:07:05 +0200, Wren Turkal <wt@...guintechs.org> said:
> On 4/22/24 6:00 AM, Bartosz Golaszewski wrote:
>> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>>
>> Any return value from gpiod_get_optional() other than a pointer to a
>> GPIO descriptor or a NULL-pointer is an error and the driver should
>> abort probing. That being said: commit 56d074d26c58 ("Bluetooth: hci_qca:
>> don't use IS_ERR_OR_NULL() with gpiod_get_optional()") no longer sets
>> power_ctrl_enabled on NULL-pointer returned by
>> devm_gpiod_get_optional(). Restore this behavior but bail-out on errors.
>
> Nack. This patch does fixes neither the disable/re-enable problem nor
> the warm boot problem.
>
> Zijun replied to this patch also with what I think is the proper
> reasoning for why it doesn't fix my setup.
>

Indeed, I only addressed a single issue here and not the code under the
default: label of the switch case. Sorry.

Could you give the following diff a try?

Bart

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index 92fa20f5ac7d..0e98ad2c0c9d 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -2327,16 +2327,21 @@ static int qca_serdev_probe(struct
serdev_device *serdev)
 		    (data->soc_type == QCA_WCN6750 ||
 		     data->soc_type == QCA_WCN6855)) {
 			dev_err(&serdev->dev, "failed to acquire BT_EN gpio\n");
-			power_ctrl_enabled = false;
+			return PTR_ERR(qcadev->bt_en);
 		}

+		if (!qcadev->bt_en)
+			power_ctrl_enabled = false;
+
 		qcadev->sw_ctrl = devm_gpiod_get_optional(&serdev->dev, "swctrl",
 					       GPIOD_IN);
 		if (IS_ERR(qcadev->sw_ctrl) &&
 		    (data->soc_type == QCA_WCN6750 ||
 		     data->soc_type == QCA_WCN6855 ||
-		     data->soc_type == QCA_WCN7850))
-			dev_warn(&serdev->dev, "failed to acquire SW_CTRL gpio\n");
+		     data->soc_type == QCA_WCN7850)) {
+			dev_err(&serdev->dev, "failed to acquire SW_CTRL gpio\n");
+			return PTR_ERR(qcadev->sw_ctrl);
+		}

 		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
 		if (IS_ERR(qcadev->susclk)) {
@@ -2355,10 +2360,13 @@ static int qca_serdev_probe(struct
serdev_device *serdev)
 		qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
 					       GPIOD_OUT_LOW);
 		if (IS_ERR(qcadev->bt_en)) {
-			dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
-			power_ctrl_enabled = false;
+			dev_err(&serdev->dev, "failed to acquire enable gpio\n");
+			return PTR_ERR(qcadev->bt_en);
 		}

+		if (!qcadev->bt_en)
+			power_ctrl_enabled = false;
+
 		qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
 		if (IS_ERR(qcadev->susclk)) {
 			dev_warn(&serdev->dev, "failed to acquire clk\n");