linux-kernel - Re: [PATCH] Bluetooth: hci_h5: Add RTL8822CS capabilities

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Date:   Fri, 14 May 2021 00:32:55 +0800
From:   Archie Pusaka <apusaka@...gle.com>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>,
        Archie Pusaka <apusaka@...omium.org>,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Bluetooth: hci_h5: Add RTL8822CS capabilities

[Re-sending in plaintext, sorry for spam]
Hi Marcel,

On Thu, 13 May 2021 at 23:14, Marcel Holtmann <marcel@...tmann.org> wrote:
>
> Hi Archie,
>
> > RTL8822 chipset supports WBS, and this information is conveyed in
> > btusb.c. However, the UART driver doesn't have this information just
> > yet.
> >
> > Signed-off-by: Archie Pusaka <apusaka@...omium.org>
> > Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> > ---
> >
> > drivers/bluetooth/btrtl.c  | 26 ++++++++++++++++----------
> > drivers/bluetooth/btrtl.h  |  2 ++
> > drivers/bluetooth/hci_h5.c |  5 +----
> > 3 files changed, 19 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
> > index e7fe5fb22753..988a09860c6b 100644
> > --- a/drivers/bluetooth/btrtl.c
> > +++ b/drivers/bluetooth/btrtl.c
> > @@ -719,17 +719,8 @@ int btrtl_download_firmware(struct hci_dev *hdev,
> > }
> > EXPORT_SYMBOL_GPL(btrtl_download_firmware);
> >
> > -int btrtl_setup_realtek(struct hci_dev *hdev)
> > +void btrtl_set_quirks(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev)
> > {
> > -     struct btrtl_device_info *btrtl_dev;
> > -     int ret;
> > -
> > -     btrtl_dev = btrtl_initialize(hdev, NULL);
> > -     if (IS_ERR(btrtl_dev))
> > -             return PTR_ERR(btrtl_dev);
> > -
> > -     ret = btrtl_download_firmware(hdev, btrtl_dev);
> > -
> >       /* Enable controller to do both LE scan and BR/EDR inquiry
> >        * simultaneously.
> >        */
> > @@ -750,6 +741,21 @@ int btrtl_setup_realtek(struct hci_dev *hdev)
> >               rtl_dev_dbg(hdev, "WBS supported not enabled.");
> >               break;
> >       }
> > +}
> > +EXPORT_SYMBOL_GPL(btrtl_set_quirks);
> > +
> > +int btrtl_setup_realtek(struct hci_dev *hdev)
> > +{
> > +     struct btrtl_device_info *btrtl_dev;
> > +     int ret;
> > +
> > +     btrtl_dev = btrtl_initialize(hdev, NULL);
> > +     if (IS_ERR(btrtl_dev))
> > +             return PTR_ERR(btrtl_dev);
> > +
> > +     ret = btrtl_download_firmware(hdev, btrtl_dev);
> > +
> > +     btrtl_set_quirks(hdev, btrtl_dev);
> >
> >       btrtl_free(btrtl_dev);
> >       return ret;
> > diff --git a/drivers/bluetooth/btrtl.h b/drivers/bluetooth/btrtl.h
> > index 2a582682136d..260167f01b08 100644
> > --- a/drivers/bluetooth/btrtl.h
> > +++ b/drivers/bluetooth/btrtl.h
> > @@ -54,6 +54,8 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
> > void btrtl_free(struct btrtl_device_info *btrtl_dev);
> > int btrtl_download_firmware(struct hci_dev *hdev,
> >                           struct btrtl_device_info *btrtl_dev);
> > +void btrtl_set_quirks(struct hci_dev *hdev,
> > +                   struct btrtl_device_info *btrtl_dev);
> > int btrtl_setup_realtek(struct hci_dev *hdev);
> > int btrtl_shutdown_realtek(struct hci_dev *hdev);
> > int btrtl_get_uart_settings(struct hci_dev *hdev,
> > diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
> > index 27e96681d583..e0520639f4ba 100644
> > --- a/drivers/bluetooth/hci_h5.c
> > +++ b/drivers/bluetooth/hci_h5.c
> > @@ -906,10 +906,7 @@ static int h5_btrtl_setup(struct h5 *h5)
> >       /* Give the device some time before the hci-core sends it a reset */
> >       usleep_range(10000, 20000);
> >
> > -     /* Enable controller to do both LE scan and BR/EDR inquiry
> > -      * simultaneously.
> > -      */
> > -     set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &h5->hu->hdev->quirks);
> > +     btrtl_set_quirks(h5->hu->hdev, btrtl_dev);
>
> any reason why not just setting WBS quirk here?

Hmm, I think WBS is the feature of the chipset and not the transport.
Therefore isn't it better to just have it set in one place?
Setting the quirks here means we need to copy paste the settings from btrtl.c.

Cheers,
Archie