Bluetooth: btusb: fix bt fiwmare downloading failure issue for qca btsoc.

From: Tim Jiang <redacted>

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 <redacted>
---
 drivers/bluetooth/btusb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 5245714..b0743db 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c

@@ -4064,6 +4064,7 @@ static int btusb_setup_qca_download_fw(struct hci_dev *hdev,
 
 	sent += size;
 	count -= size;
+	msleep(20);
 
 	while (count) {
 		size = min_t(size_t, count, QCA_DFU_PACKET_LEN);

-- 
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Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=488581

---Test result---

Test Summary:
CheckPatch                    PASS      0.81 seconds
GitLint                       FAIL      0.13 seconds
BuildKernel                   PASS      582.56 seconds
TestRunner: Setup             PASS      389.93 seconds
TestRunner: l2cap-tester      PASS      3.02 seconds
TestRunner: bnep-tester       PASS      2.03 seconds
TestRunner: mgmt-tester       PASS      29.93 seconds
TestRunner: rfcomm-tester     PASS      2.20 seconds
TestRunner: sco-tester        PASS      2.22 seconds
TestRunner: smp-tester        PASS      2.30 seconds
TestRunner: userchan-tester   PASS      2.04 seconds

Details
##############################
Test: CheckPatch - PASS - 0.81 seconds
Run checkpatch.pl script with rule in .checkpatch.conf


##############################
Test: GitLint - FAIL - 0.13 seconds
Run gitlint with rule in .gitlint
Bluetooth: btusb: fix bt fiwmare downloading failure issue for qca btsoc.
1: T1 Title exceeds max length (73>72): "Bluetooth: btusb: fix bt fiwmare downloading failure issue for qca btsoc."
1: T3 Title has trailing punctuation (.): "Bluetooth: btusb: fix bt fiwmare downloading failure issue for qca btsoc."


##############################
Test: BuildKernel - PASS - 582.56 seconds
Build Kernel with minimal configuration supports Bluetooth

48 more lines

Hi Zijun,

you need a comment here explain why this is needed.

+	msleep(20);

	while (count) {
		size = min_t(size_t, count, QCA_DFU_PACKET_LEN);

Regards

Marcel