This is a note to let you know that I've just added the patch titled
Bluetooth: btmtksdio: fix resume failure
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bluetooth-btmtksdio-fix-resume-failure.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 35ebb13ac87d1caa8425fc0f932f7e3d9617a9d2
Author: Sean Wang <sean.wang@xxxxxxxxxxxx>
Date: Thu Dec 2 02:02:47 2021 +0800
Bluetooth: btmtksdio: fix resume failure
[ Upstream commit 561ae1d46a8ddcbc13162d5771f5ed6c8249e730 ]
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>
Signed-off-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index 304178be1ef40..c2eb64bcd5d5d 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -1041,6 +1041,8 @@ static int btmtksdio_runtime_suspend(struct device *dev)
if (!bdev)
return 0;
+ sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
+
sdio_claim_host(bdev->func);
sdio_writel(bdev->func, C_FW_OWN_REQ_SET, MTK_REG_CHLPCR, &err);
