Received-SPF: pass (google.com: domain of linux-bluetooth+bounces-4002-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
Message-ID: <734d9e8e-77d9-4282-8d17-3a6b632191cb@quicinc.com>
Date: Wed, 24 Apr 2024 22:01:00 +0800
Precedence: bulk
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH v6 1/2] Bluetooth: qca: Fix BT enable failure for QCA6390
To: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
CC: Wren Turkal <wt@penguintechs.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski@linaro.org>,
        <luiz.von.dentz@intel.com>, <marcel@holtmann.org>,
        <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>
 <053f51ae-1eb7-4ea8-bb04-38bfa1e0b8f5@quicinc.com>
 <CABBYNZKt0B9bKfAsP+wUJAeSoc93Otm8NFpos15AgoLV0hwrCA@mail.gmail.com>
Content-Language: en-US
From: quic_zijuhu <quic_zijuhu@quicinc.com>
In-Reply-To: <CABBYNZKt0B9bKfAsP+wUJAeSoc93Otm8NFpos15AgoLV0hwrCA@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8bit

On 4/24/2024 9:56 PM, Luiz Augusto von Dentz wrote:
> Hi Quic_zijuhu,
> 
> On Wed, Apr 24, 2024 at 1:33 AM quic_zijuhu <quic_zijuhu@quicinc.com> wrote:
>>
>> 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.
> 
> Well I really hope we get some more support upstream because things
> don't look quite clean right now and it should be a lesson that you
> guys need to spend more time reviewing what goes upstream otherwise
> things escalate since there isn't much documentation about your
> hardware we can rely on.
> 
thanks for your reminder. i will push company setup bluez team for QCA
BT driver.
>>>>
>>>> Best regards,
>>>> Krzysztof
>>>>
>>>
>>
> 
>