linux-kernel - Re: [PATCH 1/3] Bluetooth: hci_qca: Only remove TX clock vote after TX is completed

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Message-ID: <CANFp7mW48xUkdH2OS4UFWyqB-EeoD1NMdtwcNSV8xSxUjwgy2w@mail.gmail.com>
Date:   Fri, 5 Jun 2020 13:44:10 -0700
From:   Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Bluez mailing list <linux-bluetooth@...r.kernel.org>,
        Rocky Liao <rjliao@...eaurora.org>,
        Zijun Hu <zijuhu@...eaurora.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>,
        Claire Chang <tientzu@...omium.org>
Subject: Re: [PATCH 1/3] Bluetooth: hci_qca: Only remove TX clock vote after
 TX is completed

Hi,

On Fri, Jun 5, 2020 at 11:46 AM Matthias Kaehlcke <mka@...omium.org> wrote:
>
> qca_suspend() removes the vote for the UART TX clock after
> writing an IBS sleep request to the serial buffer. This is
> not a good idea since there is no guarantee that the request
> has been sent at this point. Instead remove the vote after
> successfully entering IBS sleep. This also fixes the issue
> of the vote being removed in case of an aborted suspend due
> to a failure of entering IBS sleep.
>
> Fixes: 41d5b25fed0a0 ("Bluetooth: hci_qca: add PM support")
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
>
>  drivers/bluetooth/hci_qca.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index ece9f91cc3deb..b1d82d32892e9 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -2083,8 +2083,6 @@ static int __maybe_unused qca_suspend(struct device *dev)
>
>                 qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
>                 qca->ibs_sent_slps++;
> -
> -               qca_wq_serial_tx_clock_vote_off(&qca->ws_tx_vote_off);
>                 break;
>
>         case HCI_IBS_TX_ASLEEP:
> @@ -2112,8 +2110,10 @@ static int __maybe_unused qca_suspend(struct device *dev)
>                         qca->rx_ibs_state == HCI_IBS_RX_ASLEEP,
>                         msecs_to_jiffies(IBS_BTSOC_TX_IDLE_TIMEOUT_MS));
>
> -       if (ret > 0)
> +       if (ret > 0) {
> +               qca_wq_serial_tx_clock_vote_off(&qca->ws_tx_vote_off);
>                 return 0;
> +       }
>
>         if (ret == 0)
>                 ret = -ETIMEDOUT;
> --
> 2.27.0.278.ge193c7cf3a9-goog
>

I checked the order of calls and it looks correct per commit message.

Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>