From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
To: Wren Turkal <wt@penguintechs.org>
Cc: quic_zijuhu <quic_zijuhu@quicinc.com>,
Krzysztof Kozlowski <krzk@kernel.org>,
luiz.dentz@gmail.com, luiz.von.dentz@intel.com,
marcel@holtmann.org, linux-bluetooth@vger.kernel.org,
regressions@lists.linux.dev
Subject: Re: [PATCH v4 0/2] Fix two regression issues for QCA controllers
Date: Mon, 22 Apr 2024 10:51:24 +0200 [thread overview]
Message-ID: <CACMJSevocRot6J06uvridRw9MZFftJrkCyYBgXhLnwfapVPnCw@mail.gmail.com> (raw)
In-Reply-To: <dc17aea1-9399-4c2b-8775-fa0a7f602035@penguintechs.org>
On Mon, 22 Apr 2024 at 07:21, Wren Turkal <wt@penguintechs.org> wrote:
>
> As the user who originally reported thes issue, I can confirm this. I
> was introduced to this regression because I use Fedora Rawhide on my
> laptop, which builds and pushes kernels based on mainline very regularly.
>
I don't doubt my patch could have caused a regression.
> Here is my description of the regression: After the reverted change, the
> BT hardware in my laptop (qca6390) will only work after a cold boot when
> the hardware has only be enabled once by the driver. Once the hardware
> is enabled, the process of disabling/re-enabling fails. Also, the
> hardware cannot be enabled after a warm boot of the laptop.
>
> Among other things, this makes logging into KDE Plasma break my
> bluetooth mouse. The cause of this breakage appears to be that Plasma
> disables/re-enables bluetooth hardware upon login.
>
> GNOME operates slightly less badly in that bluetooth stays enabled.
> However, if I manually disable the bluetooth via the ui or by restarting
> the bluetooth service with systemctl, the mouse fails in the same way as
> happens with Plasma.
>
> Once the bluetooth has failed, the only way to fix is a cold boot and
> only enable the hardware once. I cannot remove the modules (btqca,
> hci_uart, and bluetooth) and re-modprobe them to fix it. I can't restart
> the bluetooth service. I can't do both of those things. I haven't found
> any way to re-enable the hardware beyond cold boot with bluetooth
> service enabled.
>
> If I disable the bluetooth service and cold boot the laptop, there also
> appears to be some kind of race condition as not enabling bluetooth
> service very soon after loading the hci_uart and btqca modules during
> boot puts the system in a state where I can never enable bluetooth. I do
> not know what causes this specifically, but my theory is that not
> starting the bluetooth service immediately puts the driver in a similar
> state as when the service is started immediately. Maybe some kind of
> lazy initialization that is forced to happen more quickly when the
> bluetooth service is enabled?
>
> Any way, this reversion by itself (which I manually did after a
> discussion with Zijun before getting his test patches applying to my
> kernel for test). However, this reversion did not get the hardware
> working after a warm boot.
>
This all sounds plausible. However just reverting this patch is a
waste of time as checking IS_ERR_OR_NULL() on the return value of
gpiod_get_optional() and continuing on error is wrong as I explained
several times under Ziju's emails already. I provided a suggestion:
bail out on error returned from gpiod_get_optional() even if the
driver could technically continue in some cases. I don't want to have
to argue this anymore.
Bart
next prev parent reply other threads:[~2024-04-22 8:51 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-18 14:06 [PATCH v1 0/2] Fix two regression issues for QCA controllers Zijun Hu
2024-04-18 14:06 ` [PATCH v1 1/2] Revert "Bluetooth: hci_qca: don't use IS_ERR_OR_NULL() with gpiod_get_optional()" Zijun Hu
2024-04-18 14:31 ` Fix two regression issues for QCA controllers bluez.test.bot
2024-04-18 16:52 ` [PATCH v1 1/2] Revert "Bluetooth: hci_qca: don't use IS_ERR_OR_NULL() with gpiod_get_optional()" Krzysztof Kozlowski
2024-04-18 21:16 ` quic_zijuhu
2024-04-18 22:37 ` Krzysztof Kozlowski
2024-04-18 23:17 ` quic_zijuhu
2024-04-19 13:49 ` Krzysztof Kozlowski
2024-04-20 5:25 ` quic_zijuhu
2024-04-20 5:27 ` quic_zijuhu
2024-04-20 11:13 ` Krzysztof Kozlowski
2024-04-20 23:01 ` quic_zijuhu
2024-04-18 17:00 ` Bartosz Golaszewski
2024-04-18 21:43 ` quic_zijuhu
2024-04-18 22:42 ` Bartosz Golaszewski
2024-04-18 23:36 ` quic_zijuhu
2024-04-19 21:27 ` Bartosz Golaszewski
2024-04-20 5:39 ` quic_zijuhu
2024-04-21 7:14 ` Wren Turkal
2024-04-21 9:40 ` quic_zijuhu
2024-04-22 5:26 ` Wren Turkal
2024-04-18 14:06 ` [PATCH v1 2/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390 after disable then warm reboot Zijun Hu
2024-04-18 16:48 ` Krzysztof Kozlowski
2024-04-18 20:34 ` quic_zijuhu
2024-04-18 20:58 ` Krzysztof Kozlowski
2024-04-18 22:05 ` quic_zijuhu
2024-04-18 22:38 ` Krzysztof Kozlowski
2024-04-18 23:24 ` quic_zijuhu
2024-04-19 21:48 ` [PATCH v1 0/2] Fix two regression issues for QCA controllers Zijun Hu
2024-04-19 21:48 ` [PATCH v2 1/2] Bluetooth: MGMT: Fix failing to MGMT_OP_ADD_UUID/MGMT_OP_REMOVE_UUID Zijun Hu
2024-04-19 22:05 ` quic_zijuhu
2024-04-19 22:12 ` [v2,1/2] " bluez.test.bot
2024-04-19 21:48 ` [PATCH v2 2/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390 Zijun Hu
2024-04-19 22:06 ` quic_zijuhu
2024-04-19 22:03 ` [PATCH v3 0/2] Fix two regression issues for QCA controllers Zijun Hu
2024-04-19 22:03 ` [PATCH v3 1/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390 Zijun Hu
2024-04-19 22:30 ` Fix two regression issues for QCA controllers bluez.test.bot
2024-04-20 11:03 ` [PATCH v3 1/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390 Krzysztof Kozlowski
2024-04-20 21:28 ` quic_zijuhu
2024-04-19 22:03 ` [PATCH v3 2/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390 after disable then warm reboot Zijun Hu
2024-04-20 11:07 ` Krzysztof Kozlowski
2024-04-20 21:42 ` quic_zijuhu
2024-04-20 11:01 ` [PATCH v3 0/2] Fix two regression issues for QCA controllers Krzysztof Kozlowski
2024-04-22 7:44 ` Krzysztof Kozlowski
2024-04-22 8:07 ` quic_zijuhu
2024-04-22 8:11 ` Krzysztof Kozlowski
2024-04-22 8:21 ` quic_zijuhu
2024-04-20 22:06 ` [PATCH v4 " Zijun Hu
2024-04-20 22:06 ` [PATCH v4 1/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390 Zijun Hu
2024-04-20 22:31 ` Fix two regression issues for QCA controllers bluez.test.bot
2024-04-20 22:06 ` [PATCH v4 2/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390 after disable then warm reboot Zijun Hu
2024-04-21 7:44 ` [PATCH v4 0/2] Fix two regression issues for QCA controllers Wren Turkal
2024-04-21 9:30 ` quic_zijuhu
2024-04-21 18:41 ` Krzysztof Kozlowski
2024-04-22 0:14 ` quic_zijuhu
2024-04-22 5:21 ` Wren Turkal
2024-04-22 8:51 ` Bartosz Golaszewski [this message]
2024-04-22 10:42 ` Wren Turkal
2024-04-22 13:02 ` Bartosz Golaszewski
2024-04-24 1:52 ` Wren Turkal
2024-04-22 5:52 ` Krzysztof Kozlowski
2024-04-22 6:00 ` quic_zijuhu
2024-04-22 7:45 ` Krzysztof Kozlowski
2024-04-22 10:05 ` quic_zijuhu
2024-04-22 12:28 ` Krzysztof Kozlowski
2024-04-21 13:51 ` Krzysztof Kozlowski
2024-04-22 7:38 ` [PATCH v5 " Zijun Hu
2024-04-22 7:38 ` [PATCH v5 1/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390 Zijun Hu
2024-04-22 8:36 ` Fix two regression issues for QCA controllers bluez.test.bot
2024-04-22 7:38 ` [PATCH v5 2/2] Bluetooth: qca: Fix BT enable failure for QCA_QCA6390 after disable then warm reboot Zijun Hu
2024-04-22 7:42 ` Krzysztof Kozlowski
2024-04-22 11:25 ` quic_zijuhu
2024-04-22 12:22 ` Krzysztof Kozlowski
2024-04-22 12:59 ` quic_zijuhu
2024-04-25 0:59 ` [PATCH v6 v7] Fix two BT regression issues for QCA6390 Zijun Hu
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