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Message-ID: <053f51ae-1eb7-4ea8-bb04-38bfa1e0b8f5@quicinc.com>
Date: Wed, 24 Apr 2024 13:33:50 +0800
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Subject: Re: [PATCH v6 1/2] Bluetooth: qca: Fix BT enable failure for QCA6390
To: Wren Turkal <wt@penguintechs.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski@linaro.org>,
        <luiz.dentz@gmail.com>, <luiz.von.dentz@intel.com>,
        <marcel@holtmann.org>
CC: <linux-bluetooth@vger.kernel.org>, <bartosz.golaszewski@linaro.org>,
        <regressions@lists.linux.dev>, <kernel@quicinc.com>,
        Greg KH
	<gregkh@linuxfoundation.org>
References: <1713919602-5812-1-git-send-email-quic_zijuhu@quicinc.com>
 <1713919602-5812-2-git-send-email-quic_zijuhu@quicinc.com>
 <349b27a5-d2d3-46f1-b002-44f81e0cedef@linaro.org>
 <e8cd122d-e342-45c2-b078-a4ca2d8dcfff@quicinc.com>
 <dfe18768-f6da-4c60-880d-deeae3c3b04d@linaro.org>
 <8ae32009-5f5e-49a1-88a1-e330f0614f60@quicinc.com>
 <5e363318-c6e4-4874-8026-7940b434d583@linaro.org>
 <2020a858-c3d9-48a7-ad59-3691c6b98fb2@penguintechs.org>
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From: quic_zijuhu <quic_zijuhu@quicinc.com>
In-Reply-To: <2020a858-c3d9-48a7-ad59-3691c6b98fb2@penguintechs.org>
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On 4/24/2024 1:04 PM, Wren Turkal wrote:
> On 4/23/24 9:31 PM, Krzysztof Kozlowski wrote:
>> On 24/04/2024 06:18, quic_zijuhu wrote:
>>> On 4/24/2024 12:10 PM, Krzysztof Kozlowski wrote:
>>>> On 24/04/2024 06:07, quic_zijuhu wrote:
>>>>> On 4/24/2024 12:06 PM, Krzysztof Kozlowski wrote:
>>>>>> 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.
>>>>>>
>>>>> what is Bartosz' patch.
>>>>
>>>> Srsly? You were Cc'ed on it. How many upstream patches on upstream
>>>> mailing lists do you receive that you lost track of them?
>>>>
>>> Bartosz' patch have basic serious mistook and logic error and have no
>>> any help for QCA6390, and it is not suitable regarding DTS usage.
>>
>> Really? Why you did not respond with comments then? Considering how
>> imprecise and vague you are in describing real issues, I have doubts in
>> your judgment here as well.
> 
> Please slow down here. Zijun's patch works and Bartosz's patch does not.
> I don't think Zijun means any ill intent. I am replying to Bartosz's
> patch right now.
> 
this is reporter's latest verification results. actually i don't have
much time for kernel upstream. i really hope my fix is able to merged
ASAP, it will help us to solve other possible impacted QCA controllers.
>>
>> Best regards,
>> Krzysztof
>>
>