[PATCH 5.17 0446/1126] Bluetooth: mt7921s: fix firmware coredump retrieve

From: Greg Kroah-Hartman
Date: Tue Apr 05 2022 - 04:37:45 EST

From: Mark Chen <mark-yw.chen@xxxxxxxxxxxx>

[ Upstream commit 2fc967cc0dadad6735448cfbcbc77fe0ea30203d ]

According to the MCU firmware behavior, as the driver is aware of the
notification of the interrupt source FW_MAILBOX_INT that shows the MCU
completed delivered a core dump piece to the host, the driver must
acknowledge the MCU with the register PH2DSM0R bit PH2DSM0R_DRIVER_OWN
to notify the MCU to handle the next core dump piece.

Fixes: db57b625912a ("Bluetooth: btmtksdio: add support of processing firmware coredump and log")
Co-developed-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
Signed-off-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
Signed-off-by: Mark Chen <mark-yw.chen@xxxxxxxxxxxx>
Signed-off-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/bluetooth/btmtksdio.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index b5ea8d3bffaa..d4e2541a4873 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -87,8 +87,12 @@ MODULE_DEVICE_TABLE(sdio, btmtksdio_table);
#define RX_DONE_INT BIT(1)
#define TX_EMPTY BIT(2)
+#define FW_MAILBOX_INT BIT(15)
#define RX_PKT_LEN GENMASK(31, 16)

+#define MTK_REG_PH2DSM0R 0xc4
#define MTK_REG_CTDR 0x18

#define MTK_REG_CRDR 0x1c
@@ -481,6 +485,12 @@ static void btmtksdio_txrx_work(struct work_struct *work)
sdio_writel(bdev->func, int_status, MTK_REG_CHISR, NULL);

+ if ((int_status & FW_MAILBOX_INT) &&
+ bdev->data->chipid == 0x7921) {
+ sdio_writel(bdev->func, PH2DSM0R_DRIVER_OWN,
+ }
if (int_status & FW_OWN_BACK_INT)
bt_dev_dbg(bdev->hdev, "Get fw own back");