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* [PATCH AUTOSEL 4.9 03/16] Bluetooth: btqca: Add a short delay before downloading the NVM
       [not found] <20190829181736.9040-1-sashal@kernel.org>
@ 2019-08-29 18:17 ` Sasha Levin
  0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2019-08-29 18:17 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Matthias Kaehlcke, Marcel Holtmann, Sasha Levin, linux-bluetooth

From: Matthias Kaehlcke <mka@chromium.org>

[ 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>
---
 drivers/bluetooth/btqca.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
index 28afd5d585f95..b7dfa4afd5169 100644
--- a/drivers/bluetooth/btqca.c
+++ b/drivers/bluetooth/btqca.c
@@ -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",
-- 
2.20.1


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2019-08-29 18:17 ` [PATCH AUTOSEL 4.9 03/16] Bluetooth: btqca: Add a short delay before downloading the NVM Sasha Levin

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