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

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Date: Tue, 23 Apr 2024 22:07:05 -0700
From: Wren Turkal <wt@...guintechs.org>
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>,
 Zijun Hu <quic_zijuhu@...cinc.com>
Subject: Re: [PATCH] Bluetooth: qca: set power_ctrl_enabled on NULL returned
 by gpiod_get_optional()

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.

> 
> 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()")
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
>   drivers/bluetooth/hci_qca.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 92fa20f5ac7d..739248c6d6b9 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -2327,9 +2327,12 @@ 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) &&

-- 
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