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SubjectRe: [PATCH v4 3/3] Bluetooth: hci_qca: Enable power off/on support during hci down/up for QCA Rome
On Wed, Jan 15, 2020 at 04:55:52PM +0800, Rocky Liao wrote:
> This patch registers hdev->shutdown() callback and also sets
> HCI_QUIRK_NON_PERSISTENT_SETUP for QCA Rome. It will power-off the BT chip
> during hci down and power-on/initialize the chip again during hci up. As
> wcn399x already enabled this, this patch also removed the callback register
> and QUIRK setting in qca_setup() for wcn399x and uniformly do this in the
> probe() routine.
>
> Signed-off-by: Rocky Liao <rjliao@codeaurora.org>
> ---
>
> Changes in v2: None
> Changes in v3:
> -moved the quirk and callback register to probe()
> Changes in v4:
> -rebased the patch with latest code
> -moved the quirk and callback register to probe() for wcn399x
> -updated commit message
>
> drivers/bluetooth/hci_qca.c | 14 ++++++++------
> 1 file changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 1139142e8eed..3c6c6bd20177 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -1569,12 +1569,7 @@ static int qca_setup(struct hci_uart *hu)
> return ret;
>
> if (qca_is_wcn399x(soc_type)) {
> - /* Enable NON_PERSISTENT_SETUP QUIRK to ensure to execute
> - * setup for every hci up.
> - */
> - set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
> set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);

I guess this should also move to _probe() eventually, but it's not really
the scope of this patch.

> - hu->hdev->shutdown = qca_power_off;
>
> ret = qca_read_soc_version(hdev, &soc_ver, soc_type);
> if (ret)
> @@ -1813,6 +1808,7 @@ static int qca_init_regulators(struct qca_power *qca,
> static int qca_serdev_probe(struct serdev_device *serdev)
> {
> struct qca_serdev *qcadev;
> + struct hci_dev *hdev;
> const struct qca_vreg_data *data;
> int err;
>
> @@ -1881,7 +1877,13 @@ static int qca_serdev_probe(struct serdev_device *serdev)
> clk_disable_unprepare(qcadev->susclk);
> }
>
> -out: return err;
> +out:
> + if (!err) {
> + hdev = qcadev->serdev_hu.hdev;
> + set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
> + hdev->shutdown = qca_power_off;
> + }
> + return err;

Since there is no unwinding in case of an error I would suggest to
change the jumps to the 'out' label further above to 'return err;'
and change the above lines to:

hdev = qcadev->serdev_hu.hdev;
set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
hdev->shutdown = qca_power_off;

return 0;

This will also require to return directly when hci_uart_register_device()
fails.

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