linux-kernel - Re: [PATCH v2] Bluetooth: qca: set power_ctrl_enabled on NULL returned by gpiod_get

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Message-ID: <2d3823bd-bc30-4e3f-a350-eb9a718261aa@quicinc.com>
Date: Wed, 24 Apr 2024 20:59:35 +0800
From: quic_zijuhu <quic_zijuhu@...cinc.com>
To: Bartosz Golaszewski <brgl@...ev.pl>,
        Marcel Holtmann
	<marcel@...tmann.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC: <linux-bluetooth@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Bartosz
 Golaszewski <bartosz.golaszewski@...aro.org>,
        Wren Turkal
	<wt@...guintechs.org>
Subject: Re: [PATCH v2] Bluetooth: qca: set power_ctrl_enabled on NULL
 returned by gpiod_get_optional()

On 4/24/2024 8:29 PM, 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.
> While at it: also bail-out on error returned when trying to get the
> "swctrl" GPIO.
> 
> Reported-by: Wren Turkal <wt@...guintechs.org>
> Reported-by: Zijun Hu <quic_zijuhu@...cinc.com>
> Closes: https://lore.kernel.org/linux-bluetooth/1713449192-25926-2-git-send-email-quic_zijuhu@quicinc.com/
> Fixes: 56d074d26c58 ("Bluetooth: hci_qca: don't use IS_ERR_OR_NULL() with gpiod_get_optional()")
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
is it really reviewed-by Krzysztof?
suggest reviewer give explicit review-by tag by public way, then you add
this tag.
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
> v1 -> v2:
> - also restore the previous behavior for QCA6390 and other models that
>   fall under the default: label in the affected switch case
> - bail-out on errors when getting the swctrl GPIO too
> 
>  drivers/bluetooth/hci_qca.c | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)
> 
> 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;
> +
think about what will happen for present lunched products if this type
error really happens.
BT don't work at all with your change. BT can be used mostly without
your change.
			return PTR_ERR(qcadev->bt_en);
>  		}
>  
> +		if (!qcadev->bt_en)
> +			power_ctrl_enabled = false;
> +
you don't answer me how to treat a required enable is not configured by user
>  		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);have the same question as above.
> +		}
>  
>  		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);
>  		}
> 
have the same question as above.
is it right for such prompt ?
> +		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");
have the same question as above.

how do you known the root cause of the issue reported without my earlier
debugging and fix?

do my fix regarding the issue i concerned have any  fault?

NAK by me.