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Message-ID: <349b27a5-d2d3-46f1-b002-44f81e0cedef@linaro.org>
Date: Wed, 24 Apr 2024 06:06:25 +0200
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Subject: Re: [PATCH v6 1/2] Bluetooth: qca: Fix BT enable failure for QCA6390
To: Zijun Hu <quic_zijuhu@quicinc.com>, luiz.dentz@gmail.com,
 luiz.von.dentz@intel.com, marcel@holtmann.org
Cc: linux-bluetooth@vger.kernel.org, bartosz.golaszewski@linaro.org,
 wt@penguintechs.org, regressions@lists.linux.dev, kernel@quicinc.com
References: <1713919602-5812-1-git-send-email-quic_zijuhu@quicinc.com>
 <1713919602-5812-2-git-send-email-quic_zijuhu@quicinc.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <1713919602-5812-2-git-send-email-quic_zijuhu@quicinc.com>
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On 24/04/2024 02:46, Zijun Hu wrote:
> 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 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 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>

No, Bartosz' patch should go.

Best regards,
Krzysztof