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Commit 59d76363 authored by Matthias Kaehlcke's avatar Matthias Kaehlcke Committed by Greg Kroah-Hartman
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Bluetooth: btqca: Add a short delay before downloading the NVM 



[ Upstream commit 8059ba0bd0e4694e51c2ee6438a77b325f06c0d5 ]

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: default avatarMatthias Kaehlcke <mka@chromium.org>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 1ed1d4d7

drivers/bluetooth/btqca.c

+3 −0
Original line number Diff line number Diff line
@@ -363,6 +363,9 @@ int qca_uart_setup_rome(struct hci_dev *hdev, uint8_t baudrate) 
		return err;

	}



	/* Give the controller some time to get ready to receive the NVM */

	msleep(10);



	/* Download NVM configuration */

	config.type = TLV_TYPE_NVM;

	snprintf(config.fwname, sizeof(config.fwname), "qca/nvm_%08x.bin",