Hi Hans,
> Commit 61f5acea8737 ("Bluetooth: btusb: Restore QCA Rome suspend/resume fix
> with a "rewritten" version") applied the USB_QUIRK_RESET_RESUME to all QCA
> btusb devices. But it turns out that the resume problems are not caused by
> the QCA Rome chipset, on most platforms it resumes fine. The resume
> problems are actually a platform problem (likely the platform cutting all
> power when suspended).
>
> The USB_QUIRK_RESET_RESUME quirk also disable runtime suspend, so by
> matching on usb-ids, we're causing all boards with these chips to use extra
> power, to fix resume problems which only happen on some boards.
>
> This commit fixes this by applying the quirk based on DMI matching instead
> of on usb-ids, so that we match the platform and not the chipset.
just for the record, can we include the /sys/kernel/debug/usb/devices for that device here.
>
> Fixes: 61f5acea8737 ("Bluetooth: btusb: Restore QCA Rome suspend/resume..")
> Cc: stable@xxxxxxxxxxxxxxx
> Cc: Brian Norris <briannorris@xxxxxxxxxxxx>
> Cc: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> drivers/bluetooth/btusb.c | 26 ++++++++++++++++++++------
> 1 file changed, 20 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 2a55380ad730..a6023667f3b4 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -21,6 +21,7 @@
> *
> */
>
> +#include <linux/dmi.h>
> #include <linux/module.h>
> #include <linux/usb.h>
> #include <linux/usb/quirks.h>
> @@ -379,6 +380,22 @@ static const struct usb_device_id blacklist_table[] = {
> { } /* Terminating entry */
> };
>
> +/*
> + * The btusb build into some devices needs to be reset on resume, this is a
Actually “btusb” is a driver name. So “Bluetooth USB modules”
> + * problem with the platform (likely shutting off all power) not with the
> + * btusb chip itself. So we use a DMI list to match known broken platforms.
Here s/btusb/module/
> + */
> +static const struct dmi_system_id btusb_plat_needs_reset_resume_list[] = {
I prefer to use _table instead of _list. Also drop the _plat_ part since that seems obvious.
> + {
> + /* Lenovo yoga 920 */
Use “Yoga" please.
And I would include “(QCA Rome device VID:PID)” so that we have a record of some sorts.
> + .matches = {
> + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> + DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo YOGA 920”),
No DMI_EXACT_MATCH?
> + },
> + },
> + {}
> +};
> +
> #define BTUSB_MAX_ISOC_FRAMES 10
>
> #define BTUSB_INTR_RUNNING 0
> @@ -2945,6 +2962,9 @@ static int btusb_probe(struct usb_interface *intf,
> hdev->send = btusb_send_frame;
> hdev->notify = btusb_notify;
>
> + if (dmi_check_system(btusb_plat_needs_reset_resume_list))
> + interface_to_usbdev(intf)->quirks |= USB_QUIRK_RESET_RESUME;
> +
> #ifdef CONFIG_PM
> err = btusb_config_oob_wake(hdev);
> if (err)
> @@ -3031,12 +3051,6 @@ static int btusb_probe(struct usb_interface *intf,
> if (id->driver_info & BTUSB_QCA_ROME) {
> data->setup_on_usb = btusb_setup_qca;
> hdev->set_bdaddr = btusb_set_bdaddr_ath3012;
> -
> - /* QCA Rome devices lose their updated firmware over suspend,
> - * but the USB hub doesn't notice any status change.
> - * explicitly request a device reset on resume.
> - */
> - interface_to_usbdev(intf)->quirks |= USB_QUIRK_RESET_RESUME;
> }
It is all cosmetic. So otherwise this looks good.
Regards
Marcel