From: Tim Jiang tjiang@codeaurora.org
stable inclusion from stable-5.10.51 commit e2296a4365f2e60b8e70425d83181e6c0f0d7a63 bugzilla: 175263 https://gitee.com/openeuler/kernel/issues/I4DT6F
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 4f00bfb372674d586c4a261bfc595cbce101fbb6 ]
This is btsoc timing issue, after host start to downloading bt firmware, ep2 need time to switch from function acl to function dfu, so host add 20ms delay as workaround.
Signed-off-by: Tim Jiang tjiang@codeaurora.org Signed-off-by: Marcel Holtmann marcel@holtmann.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/bluetooth/btusb.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index b3c63e06838d..afd2b1f12d49 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -3558,6 +3558,11 @@ static int btusb_setup_qca_download_fw(struct hci_dev *hdev, sent += size; count -= size;
+ /* ep2 need time to switch from function acl to function dfu, + * so we add 20ms delay here. + */ + msleep(20); + while (count) { size = min_t(size_t, count, QCA_DFU_PACKET_LEN);