Hi Matthias, > On WCN3990 downloading the NVM sometimes fails with a "TLV response > size mismatch" error: > > [ 174.949955] Bluetooth: btqca.c:qca_download_firmware() hci0: QCA > Downloading qca/crnv21.bin > [ 174.958718] Bluetooth: btqca.c:qca_tlv_send_segment() hci0: QCA TLV > response size mismatch > > It seems the controller needs a short time after downloading the > firmware before it is ready for the NVM. A delay as short as 1 ms > seems sufficient, make it 10 ms just in case. No event is received > during the delay, hence we don't just silently drop an extra event. > > Signed-off-by: Matthias Kaehlcke <[email protected]> > --- > I'm only guessing why the delay is needed, maybe QCA folks can shed > more light on this. > > I didn't see this error when testing 2faa3f15fa2f ("Bluetooth: hci_qca: > wcn3990: Drop baudrate change vendor event") and 32646db8cc28 > ("Bluetooth: btqca: inject command complete event during fw download") > intensively a few months ago. My guess is that some changes in the kernel > (I test with a 4.19 kernel with regular -stable merges) altered the > timing, which made this issue visible. > --- > drivers/bluetooth/btqca.c | 3 +++ > 1 file changed, 3 insertions(+)
patch has been applied to bluetooth-next tree. Regards Marcel
