linux-kernel - Re: [PATCH] Bluetooth: qca: set power_ctrl_enabled on NULL returned by gpiod_get

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Message-ID: <aca9dc3c-a916-48d1-8a00-459d4e7d584a@penguintechs.org>
Date: Wed, 24 Apr 2024 15:09:54 -0700
From: Wren Turkal <wt@...guintechs.org>
To: quic_zijuhu <quic_zijuhu@...cinc.com>, Bartosz Golaszewski <brgl@...ev.pl>
Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
 linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
 Marcel Holtmann <marcel@...tmann.org>,
 Luiz Augusto von Dentz <luiz.dentz@...il.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH] Bluetooth: qca: set power_ctrl_enabled on NULL returned
 by gpiod_get_optional()

On 4/24/24 6:30 AM, quic_zijuhu wrote:
> On 4/24/2024 9:26 PM, Wren Turkal wrote:
>> On 4/24/24 6:12 AM, quic_zijuhu wrote:
>>> On 4/24/2024 8:27 PM, Bartosz Golaszewski wrote:
>>>> On Wed, Apr 24, 2024 at 2:24 PM Wren Turkal <wt@...guintechs.org> wrote:
>>>>>>>>
>>>>>>>> That's OK, we have the first part right. Let's now see if we can
>>>>>>>> reuse
>>>>>>>> patch 2/2 from Zijun.
>>>>>>>
>>>>>>> I'm compiling it right now. Be back soon.
>>>>>>>
>>>>>>
>>>>>> Well I doubt it's correct as it removed Krzysztof's fix which looks
>>>>>> right. If I were to guess I'd say we need some mix of both.
>>>>>
>>>>> Patch 2/2 remove K's fix? I thought only 1/2 did that.
>>>>>
>>>>> To be specific, I have applied your patch and Zijun's 2/2 only.
>>>>>
>>>>
>>>> No, patch 1/2 from Zijun reverted my changes. Patch 2/2 removes
>>>> Krzysztof's changes and replaces them with a different if else. This
>>>> patch is a better alternative to Zijun's patch 1/2. For 2/2, I'll let
>>>> Krzysztof handle it.
>>>>
>>> do you really realize what do you talk about?
>>> do you really listen what do @Wren says?
>>>
>>> he says that my patch 2/2 is right based on several verification results.
>>
>> she, not he
>>
>>> BTW, my 2/2 fix don't have anything about DTS usage.
>>
>> I think the problem with your 2/2 patch is that it removes the
>> conditional bailing if the device is shutdown or not open.
>>
>> Maybe this patch instead?
>>
>> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
>> index 2f7ae38d85eb..fcac44ae7898 100644
>> --- a/drivers/bluetooth/hci_qca.c
>> +++ b/drivers/bluetooth/hci_qca.c
>> @@ -2456,6 +2456,10 @@ static void qca_serdev_shutdown(struct device *dev)
>>                      !test_bit(HCI_RUNNING, &hdev->flags))
>>                          return;
>>
>> +               if (test_bit(HCI_QUIRK_NON_PERSISTENT_SETUP,
>> &hdev->quirks) ||
>> +                   hci_dev_test_flag(hdev, HCI_SETUP))
>> +                       return;
>> +
>>                  serdev_device_write_flush(serdev);
>>                  ret = serdev_device_write_buf(serdev, ibs_wake_cmd,
>>                                                sizeof(ibs_wake_cmd));
>>
>>> he maybe be a DTS expert but not BT from his present fix history for
>>> bluetooth system.
>>
>>
> Hi Wren,
> i think i don't need to care about why wrong condition cause wrong results.

I can't speak the intellectual purity of this patch. However, I can say 
that the patch works for my hardware. I am able to disable/enable on 
cold boot and on warm boot.

@Zijun, Functionally, it seems incorporate your new logic without 
reverting Krzysztof's. Are you saying this is incorrect logic?

wt
-- 
You're more amazing than you think!