linux-kernel - Re: [PATCH] Bluetooth: qca: don't disable power management for QCA6390

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Message-ID: <CAA8EJppMPeYrPH+ssDMnf6UwHRdKQetpY3PotGvR-cc2vE68AQ@mail.gmail.com>
Date: Mon, 24 Jun 2024 23:17:29 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Marcel Holtmann <marcel@...tmann.org>, Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
	linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH] Bluetooth: qca: don't disable power management for QCA6390

On Mon, 24 Jun 2024 at 22:45, Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
> We unnecessarily fallthrough the case for QCA6390 when initializing the
> device and hit the condition where - due to the lack of the enable-gpio
> - we disable power management despite using the power sequencer. We don't
> need to look for clocks on this model so it makes more sense to just
> register the hci device and break the switch.
>
> Reported-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Fixes: 4029dba6b6f1 ("Bluetooth: qca: use the power sequencer for QCA6390")
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Is this going to break the QCA6390 as present on M.2 / PCIe cards? Or
the older DT which didn't have pwrseq entries?

> ---
>  drivers/bluetooth/hci_qca.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 2b31f3dc33a9..bc6a49ba26f9 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -2402,7 +2402,13 @@ static int qca_serdev_probe(struct serdev_device *serdev)
>                                                            "bluetooth");
>                 if (IS_ERR(qcadev->bt_power->pwrseq))
>                         return PTR_ERR(qcadev->bt_power->pwrseq);
> -               fallthrough;
> +
> +               err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
> +               if (err) {
> +                       BT_ERR("qca6390 serdev registration failed");
> +                       return err;
> +               }
> +               break;
>
>         default:
>                 qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
> --
> 2.43.0
>


-- 
With best wishes
Dmitry