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Message-ID: <5e2ffea7-556e-4623-bc25-e23367e61846@linaro.org>
Date: Sat, 20 Apr 2024 13:03:31 +0200
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Subject: Re: [PATCH v3 1/2] Bluetooth: qca: Fix BT enable failure for
 QCA_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
References: <1713449192-25926-1-git-send-email-quic_zijuhu@quicinc.com>
 <1713564212-21725-1-git-send-email-quic_zijuhu@quicinc.com>
 <1713564212-21725-2-git-send-email-quic_zijuhu@quicinc.com>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <1713564212-21725-2-git-send-email-quic_zijuhu@quicinc.com>
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On 20/04/2024 00:03, 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 BT reset pin is not configured within DT|ACPI for QCA_QCA6390.
> 
> The mentioned commit wrongly set quirk HCI_QUIRK_NON_PERSISTENT_SETUP
> within qca_serdev_probe() for this case and cause this serious issue.
> 
> 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 | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 92fa20f5ac7d..0934e74112a6 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -2357,7 +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;
>  

Please use kernel coding style, so {}.

Please run scripts/checkpatch.pl and fix reported warnings. Then please
run `scripts/checkpatch.pl --strict` and (probably) fix more warnings.
Some warnings can be ignored, especially from --strict run, but the code
here looks like it needs a fix. Feel free to get in touch if the warning
is not clear.

Best regards,
Krzysztof