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Date: Thu, 25 Apr 2024 10:37:49 -0700
From: Elliot Berman <quic_eberman@quicinc.com>
To: quic_zijuhu <quic_zijuhu@quicinc.com>
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>,
        <bartosz.golaszewski@linaro.org>, <regressions@lists.linux.dev>,
        <kernel@quicinc.com>, Greg KH
	<gregkh@linuxfoundation.org>,
        Trilok Soni <quic_tsoni@quicinc.com>,
        "Bjorn
 Andersson" <andersson@kernel.org>
Subject: Re: [PATCH v6 1/2] Bluetooth: qca: Fix BT enable failure for QCA6390
Message-ID: <20240425103329807-0700.eberman@hu-eberman-lv.qualcomm.com>
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In-Reply-To: <053f51ae-1eb7-4ea8-bb04-38bfa1e0b8f5@quicinc.com>

Hi Zijun,

On Wed, Apr 24, 2024 at 01:33:50PM +0800, quic_zijuhu 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.

I saw you were planning to slow down for a minute. When you're ready to
work on these patches again, let's get them reviewed internally first.
Please check go/upstream for some helpful hints.

Thanks,
Elliot