[PATCH 1/2] mt76: mt7663: handle failure event for patch semaphore cmd

[sean.wang at mediatek.com]

From: Sean Wang <objelf at gmail.com>

Just follow up vendor driver to retry a few times obtaining patch
semaphore when the event is PATCH_NOT_DL_SEM_FAIL. That usually
happens in Bluetooth and Wifi driver contends to download patch
simultaneously.

Co-developed-by: YN Chen <YN.Chen at mediatek.com>
Signed-off-by: YN Chen <YN.Chen at mediatek.com>
Signed-off-by:  Sean Wang <sean.wang at mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7615/mcu.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
index 2b17bd1c2a32..c990ccd6f472 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
@@ -1945,14 +1945,21 @@ static int mt7615_load_patch(struct mt7615_dev *dev, u32 addr, const char *name)
 {
 	const struct mt7615_patch_hdr *hdr;
 	const struct firmware *fw = NULL;
-	int len, ret, sem;
+	int len, ret, sem, c = 50;
 
+retry:
 	sem = mt7615_mcu_patch_sem_ctrl(dev, 1);
 	switch (sem) {
 	case PATCH_IS_DL:
 		return 0;
 	case PATCH_NOT_DL_SEM_SUCCESS:
 		break;
+	case PATCH_NOT_DL_SEM_FAIL:
+		if (is_mt7663(&dev->mt76) && c--) {
+			msleep(100);
+			goto retry;
+		}
+		fallthrough;
 	default:
 		dev_err(dev->mt76.dev, "Failed to get patch semaphore\n");
 		return -EAGAIN;
-- 
2.25.1