On Thu, Jun 2, 2022 at 9:10 AM Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote:
>
> Hi Bastian,
Hi Marcel,
> > Some adapters (e.g. RTL8723CS) advertise that they have more than
> > 2 pages for local ext features, but they don't support any features
> > declared in these pages. RTL8723CS reports max_page = 2 and declares
> > support for sync train and secure connection, but it responds with
> > either garbage or with error in status on corresponding commands.
>
>
> please include btmon output for the garbage and/or error.
We had it in v1 thread, here is relevant part:
< HCI Command: Read Local Extend.. (0x04|0x0004) plen 1 #228 [hci0] 6.889869
Page: 2
> HCI Event: Command Complete (0x0e) plen 14 #229 [hci0] 6.890487
Read Local Extended Features (0x04|0x0004) ncmd 2
Status: Success (0x00)
Page: 2/2
Features: 0x5f 0x03 0x00 0x00 0x00 0x00 0x00 0x00
Connectionless Slave Broadcast - Master
Connectionless Slave Broadcast - Slave
Synchronization Train
Synchronization Scan
Inquiry Response Notification Event
Coarse Clock Adjustment
Secure Connections (Controller Support)
Ping
< HCI Command: Delete Stored Lin.. (0x03|0x0012) plen 7 #230 [hci0] 6.890559
Address: 00:00:00:00:00:00 (OUI 00-00-00)
Delete all: 0x01
> HCI Event: Command Complete (0x0e) plen 6 #231 [hci0] 6.891170
Delete Stored Link Key (0x03|0x0012) ncmd 2
Status: Success (0x00)
Num keys: 0
< HCI Command: Read Synchronizat.. (0x03|0x0077) plen 0 #232 [hci0] 6.891199
> HCI Event: Command Complete (0x0e) plen 9 #233 [hci0] 6.891788
Read Synchronization Train Parameters (0x03|0x0077) ncmd 2
invalid packet size
01 ac bd 11 80 80 ......
= Close Index: 00:E0:4C:23:99:87 [hci0] 6.891832
> >
> > Signed-off-by: Vasily Khoruzhick <anarsoul@xxxxxxxxx>
> > [rebase on current tree]
> > Signed-off-by: Bastian Germann <bage@xxxxxxxxxx>
> > ---
> > include/net/bluetooth/hci.h | 7 +++++++
> > net/bluetooth/hci_event.c | 4 +++-
> > 2 files changed, 10 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
> > index 69ef31cea582..af26e8051905 100644
> > --- a/include/net/bluetooth/hci.h
> > +++ b/include/net/bluetooth/hci.h
> > @@ -265,6 +265,13 @@ enum {
> > * runtime suspend, because event filtering takes place there.
> > */
> > HCI_QUIRK_BROKEN_FILTER_CLEAR_ALL,
> > +
> > + /* When this quirk is set, max_page for local extended features
> > + * is set to 1, even if controller reports higher number. Some
> > + * controllers (e.g. RTL8723CS) report more pages, but they
> > + * don't actually support features declared there.
> > + */
> > + HCI_QUIRK_BROKEN_LOCAL_EXT_FTR_MAX_PAGE,
> > };
>
> Can we just call it _BROKEN_LOCAL_EXT_FEATURES_PAGE_2.
>
> Now with that said, is Secure Connections really broken? We need that bit to indicate support for this.
I don't really see the point in testing any 4.1 features if the chip
vendor claims that they are broken.
I understand your intention to get the max out of the hardware, but it
doesn't look like a good idea to me to use something that the vendor
claims to be broken.
Regards,
Vasily
> Regards
>
> Marcel
>
