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Message-ID: <16556c54-6064-4638-b3de-4e01c97a9714@quicinc.com>
Date: Wed, 24 Apr 2024 19:35:27 +0800
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Subject: Re: [PATCH v7 1/2] Bluetooth: qca: Fix BT enable failure for QCA6390
To: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
CC: Wren Turkal <wt@penguintechs.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski@linaro.org>,
        <luiz.dentz@gmail.com>, <luiz.von.dentz@intel.com>,
        <marcel@holtmann.org>, <linux-bluetooth@vger.kernel.org>,
        <regressions@lists.linux.dev>, <kernel@quicinc.com>,
        <gregkh@linuxfoundation.org>, <stable@vge.kernel.org>
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From: quic_zijuhu <quic_zijuhu@quicinc.com>
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On 4/24/2024 6:34 PM, Bartosz Golaszewski wrote:
> On Wed, 24 Apr 2024 at 11:40, quic_zijuhu <quic_zijuhu@quicinc.com> wrote:
>>
>> On 4/24/2024 2:01 PM, quic_zijuhu wrote:
>>> On 4/24/2024 1:49 PM, Wren Turkal wrote:
>>>> On 4/23/24 10:46 PM, quic_zijuhu wrote:
>>>>> On 4/24/2024 1:37 PM, Wren Turkal wrote:
>>>>>> On 4/23/24 10:02 PM, quic_zijuhu wrote:
>>>>>>> On 4/24/2024 12:30 PM, Krzysztof Kozlowski wrote:
>>>>>>>> On 24/04/2024 06:26, 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()")
>>>>>>>>> Cc: stable@vge.kernel.org
>>>>>>>>> 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>
>>>>>>>>> ---
>>>>>>>>> Changes:
>>>>>>>>> V6 -> V7: Add stable tag
>>>>>>>>
>>>>>>>> Stop sending multiple pathchsets per day. I already asked you to first
>>>>>>>> finish discussion and then send new version. You again start sending
>>>>>>>> something while previous discussion is going.
>>>>>>>> you concern is wrong and i am sure it don't block me sending new patch
>>>>>>> sets to solve other issue. so i send this v7.
>>>>>>>
>>>>>>> i have give reply for Bartosz' patch.
>>>>>>>
>>>>>>> i hop you as DTS expert to notice my concern about DTS in the reply.
>>>>>>
>>>>>> Are you saying here (1) that you identified a problem in the DTs that
>>>>>> you hope Krzysztof notices or (2) that you want Krzysztof to notice how
>>>>>> your description of way that DT declares the gpio as required affects
>>>>>> your proposed change. As a native American English speaker, I am finding
>>>>>> your text hard to follow.
>>>>>>
>>>>> 1) is my purpose. i have given my concern about DTS for Bartosz' patch
>>>>> and hope DTS expert notice the concern.
>>>>>
>>>>> my change don't have any such concern about DTS usage. that is why i
>>>>> changed my fix from original reverting the whole wrong commit to now
>>>>> focusing on QCA6390.
>>>>
>>>> Let me try to parse this. If #1 is the correct interpretation, does that
>>>> mean that the DTs are wrong and need to be changed? Do you expect K to
>>>> do that since he's the "DTS expert"?
>>>>
>>> for your 1) question, NO
>>> for your 2) question, need DTS expert notice or suggest how to handle
>>> case that a DTS property is marked as required but not be configed by user.
>>>
>>>>>> I think you are saying #2.
>>>>>>
>>>>>> I just want to make sure I am following the discussion here.
>>>>>>
>>>>>> wt
>>>>>
>>>>
>>>
>> Hi Krzysztof, bartosz.
>>
>> do you have any concern for this patch serials?
>>
> 
> Yes, we have voiced a number of concerns. Please see the fifty
> previous emails in several chaotic threads.
> 
> I will stop responding to you now, at least for some time. I
> understand that there's a regression. I will work with Wren to address
> it. Hopefully we can get it fixed soon. However I feel like I'm
> wasting my time trying to get to you and I have more things on my
> plate right now.
> 
okay, let us stop here now, i would like to summarize here.

1) it is me to co-work with reporter and solved his issue and verified
with PASS results

2) suppose you don't have any negative comments any more about my patch
serials.

3) there are no other working fixes until now when i write this summary

4) i, as a member of BT team of Qualcomm, will give comments about its
QCA BT driver changes as much as possible if i have time.

> Thanks,
> Bartosz