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From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date: Wed, 24 Apr 2024 10:02:40 -0400
Message-ID: <CABBYNZLBx4yYy4V2H1jQErXi=UaQLFRbox3FkxHFNCf8Zj0+RA@mail.gmail.com>
Subject: Re: [PATCH v6 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>, quic_zijuhu <quic_zijuhu@quicinc.com>, 
	luiz.von.dentz@intel.com, marcel@holtmann.org, 
	linux-bluetooth@vger.kernel.org, regressions@lists.linux.dev, 
	kernel@quicinc.com
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Hi Bartosz,

On Wed, Apr 24, 2024 at 9:52=E2=80=AFAM Bartosz Golaszewski
<bartosz.golaszewski@linaro.org> wrote:
>
> On Wed, 24 Apr 2024 at 15:49, Luiz Augusto von Dentz
> <luiz.dentz@gmail.com> wrote:
> >
> > Hi Wren,
> >
> > On Wed, Apr 24, 2024 at 1:04=E2=80=AFAM Wren Turkal <wt@penguintechs.or=
g> 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 regressio=
n 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 =3D devm_gpiod_get_optional(&serdev->dev, "enabl=
e",
> > > >>>>>>                                                 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 =3D 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=3D218726
> > > >>>>>> Link: https://lore.kernel.org/linux-bluetooth/ea20bb9b-6b60-47=
fc-ae42-5eed918ad7b4@quicinc.com/T/#m73d6a71d2f454bb03588c66f3ef7912274d37c=
6f
> > > >>>>>> 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 upstrea=
m
> > > >>> 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 doubt=
s in
> > > > your judgment here as well.
> > >
> > > Please slow down here. Zijun's patch works and Bartosz's patch does n=
ot.
> > > I don't think Zijun means any ill intent. I am replying to Bartosz's
> > > patch right now.
> >
> > Ok, that is great feedback, so I might be picking up the Zijun v7 set
> > if we don't find any major problems with it.
> >
>
> Luiz,
>
> Please consider my alternative[1] also tested by Wren. Zijun's usage
> of GPIO API is wrong.
>
> Bart
>
> [1] https://lore.kernel.org/linux-bluetooth/CAMRc=3DMfJ1v3pAB+Wvu1ahJAUvD=
fk3OsN5nieA-EYgTXPwMzqyg@mail.gmail.com/T/#mbf94795476d21df0a24441470ce02de=
f9d2970a7

@Wren Turkal How did you test this, what patches did you have?

--=20
Luiz Augusto von Dentz