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Bluetooth: btqca: Add a short delay before downloading the NVM

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[ 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: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Matthias Kaehlcke 2019-07-09 15:44:50 -07:00 committed by Greg Kroah-Hartman
parent 7b7a11549d
commit 32e912b91b
1 changed files with 3 additions and 0 deletions
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3
drivers/bluetooth/btqca.c
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@ -363,6 +363,9 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
return err; return err;
} }
/* Give the controller some time to get ready to receive the NVM */
msleep(10);
/* Download NVM configuration */ /* Download NVM configuration */
config.type = TLV_TYPE_NVM; config.type = TLV_TYPE_NVM;
if (soc_type == QCA_WCN3990) if (soc_type == QCA_WCN3990)