[PATCH 3/4] Bluetooth: btmtksdio: fix resume failure

From: sean.wang
Date: Fri Nov 19 2021 - 17:26:06 EST

From: Sean Wang <sean.wang@xxxxxxxxxxxx>

btmtksdio have to rely on MMC_PM_KEEP_POWER in pm_flags to avoid that
SDIO power is being shut off during the device is in suspend. That fixes
the SDIO command fails to access the bus after the device is resumed.

Fixes: 7f3c563c575e7 ("Bluetooth: btmtksdio: Add runtime PM support to SDIO based Bluetooth")
Co-developed-by: Mark-yw Chen <mark-yw.chen@xxxxxxxxxxxx>
Signed-off-by: Mark-yw Chen <mark-yw.chen@xxxxxxxxxxxx>
Signed-off-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
drivers/bluetooth/btmtksdio.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index 4c46c62e4623..cae1fcd15512 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -1040,6 +1040,8 @@ static int btmtksdio_runtime_suspend(struct device *dev)
if (!test_bit(HCI_RUNNING, &bdev->hdev->flags))
return 0;

+ sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);

sdio_writel(bdev->func, C_FW_OWN_REQ_SET, MTK_REG_CHLPCR, &err);