linux-kernel - Re: [PATCH v2] Bluetooth: qca: set power_ctrl_enabled on NULL returned by gpiod_get

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Message-ID: <e39038e2-4e61-4e28-93da-8137aa14ad51@quicinc.com>
Date: Wed, 24 Apr 2024 23:47:00 +0800
From: quic_zijuhu <quic_zijuhu@...cinc.com>
To: Luiz Augusto von Dentz <luiz.dentz@...il.com>
CC: Bartosz Golaszewski <brgl@...ev.pl>,
        Bartosz Golaszewski
	<bartosz.golaszewski@...aro.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski@...aro.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        <linux-bluetooth@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Wren
 Turkal <wt@...guintechs.org>
Subject: Re: [PATCH v2] Bluetooth: qca: set power_ctrl_enabled on NULL
 returned by gpiod_get_optional()

On 4/24/2024 11:41 PM, Luiz Augusto von Dentz wrote:
> Hi Quic_zijuhu,
> 
> On Wed, Apr 24, 2024 at 11:35 AM quic_zijuhu <quic_zijuhu@...cinc.com> wrote:
>>
>> On 4/24/2024 11:31 PM, Bartosz Golaszewski wrote:
>>> On Wed, Apr 24, 2024 at 5:30 PM quic_zijuhu <quic_zijuhu@...cinc.com> wrote:
>>>>
>>>> On 4/24/2024 11:24 PM, quic_zijuhu wrote:
>>>>> On 4/24/2024 10:52 PM, Bartosz Golaszewski wrote:
>>>>>> On Wed, 24 Apr 2024 at 16:46, Krzysztof Kozlowski
>>>>>> <krzysztof.kozlowski@...aro.org> wrote:
>>>>>>>
>>>>>>> On 24/04/2024 14:29, Bartosz Golaszewski wrote:
>>>>>>>> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>>>>>>>>
>>>>>>>
>>>>>>>>               qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
>>>>>>>>               if (IS_ERR(qcadev->susclk)) {
>>>>>>>> @@ -2355,10 +2360,13 @@ static int qca_serdev_probe(struct serdev_device *serdev)
>>>>>>>>               qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
>>>>>>>>                                              GPIOD_OUT_LOW);
>>>>>>>>               if (IS_ERR(qcadev->bt_en)) {
>>>>>>>> -                     dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
>>>>>>>> -                     power_ctrl_enabled = false;
>>>>>>>> +                     dev_err(&serdev->dev, "failed to acquire enable gpio\n");
>>>>>>>> +                     return PTR_ERR(qcadev->bt_en);
>>>>> please think about for QCA2066. if it is returned from here.  BT will
>>>>> not working at all.  if you don't return here. i will be working fine
>>>>> for every BT functionality.
>>>> sorry, correct a type error, it is QCA6390 not QCA2066.
>>>
>>> Doesn't matter. If enable-gpios is not there, gpiod_get_optional()
>>> will return NULL and we will not return.
>>>
>> i think i need to explain more for my consider case.
>> let me take QCA6390,  if the property enable-gpios is configured.
>> but IS_ERR(qcadev->bt_en) case happens, your change will do error
>> return, so BT will not work at all
>>
>> but if you don't do error return, BT will working fine.
>>
>> so your fix is not right regarding QCA6390.
> 
> Actually I'd say he is probably right with respect to DT because that
> seems to require GPIO, we probably need a clearer way to differentiate
> if a device is being set up via DT or not (btattach), in any case DT
> is probably preferable thus why I went ahead and applied this one.
> 
for QCA6390, i can confirm that enable-gpios is optional. it is bring-up
by my team. i can confirm reporter's machine don't config the GPIO pin.
DTS binding spec also don't mark it as required.

that is why i change my changing from initial reverting the whole change
to only focus on QCA6390 that is the machine reported the issue.


>>> Bart
>>>
>>>>> NAK again by me.
>>>>>
>>>>>>>>               }
>>>>>>>>
>>>>>>>> +             if (!qcadev->bt_en)
>>>>>>>> +                     power_ctrl_enabled = false;
>>>>>>>
>>>>>>> This looks duplicated - you already have such check earlier.
>>>>>>>
>>>>>>
>>>>>> It's under a different switch case!
>>>>>>
>>>>>> Bartosz
>>>>>
>>>>>
>>>>
>>
> 
>