2021-12-01 18:28:20

by Sean Wang

Subject: [PATCH v3 1/2] Bluetooth: btmtksdio: handle runtime pm only when sdio_func is available

From: Sean Wang <[email protected]>

Runtime pm ops is not aware the sdio_func status that is probably
being disabled by btmtksdio_close. Thus, we are only able to access the
sdio_func for the runtime pm operations only when the sdio_func is
available.

Fixes: 7f3c563c575e7 ("Bluetooth: btmtksdio: Add runtime PM support to SDIO based Bluetooth")
Co-developed-by: Mark-yw Chen <[email protected]>
Signed-off-by: Mark-yw Chen <[email protected]>
Signed-off-by: Sean Wang <[email protected]>
---
v2: not check HCI_RUNNING from a driver, use an internal flag instead
v3: fix the title
---
drivers/bluetooth/btmtksdio.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index d9cf0c492e29..fc6317e519e9 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -99,6 +99,7 @@ MODULE_DEVICE_TABLE(sdio, btmtksdio_table);

#define BTMTKSDIO_TX_WAIT_VND_EVT 1
#define BTMTKSDIO_HW_TX_READY 2
+#define BTMTKSDIO_FUNC_ENABLED 3

struct mtkbtsdio_hdr {
__le16 len;
@@ -539,6 +540,8 @@ static int btmtksdio_open(struct hci_dev *hdev)
if (err < 0)
goto err_release_host;

+ set_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state);
+
/* Get ownership from the device */
sdio_writel(bdev->func, C_FW_OWN_REQ_CLR, MTK_REG_CHLPCR, &err);
if (err < 0)
@@ -640,6 +643,7 @@ static int btmtksdio_close(struct hci_dev *hdev)
if (err < 0)
bt_dev_err(bdev->hdev, "Cannot return ownership to device");

+ clear_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state);
sdio_disable_func(bdev->func);

sdio_release_host(bdev->func);
@@ -1058,6 +1062,9 @@ static int btmtksdio_runtime_suspend(struct device *dev)
if (!bdev)
return 0;

+ if (!test_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state))
+ return 0;
+
sdio_claim_host(bdev->func);

sdio_writel(bdev->func, C_FW_OWN_REQ_SET, MTK_REG_CHLPCR, &err);
@@ -1085,6 +1092,9 @@ static int btmtksdio_runtime_resume(struct device *dev)
if (!bdev)
return 0;

+ if (!test_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state))
+ return 0;
+
sdio_claim_host(bdev->func);

sdio_writel(bdev->func, C_FW_OWN_REQ_CLR, MTK_REG_CHLPCR, &err);
--
2.25.1

2021-12-01 18:28:25

by Sean Wang

Subject: [PATCH v3 2/2] Bluetooth: btmtksdio: fix resume failure

From: Sean Wang <[email protected]>

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 <[email protected]>
Signed-off-by: Mark-yw Chen <[email protected]>
Signed-off-by: Sean Wang <[email protected]>
---
v2: rebase and resend
v3: no change
---
drivers/bluetooth/btmtksdio.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index fc6317e519e9..143404745240 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -1065,6 +1065,8 @@ static int btmtksdio_runtime_suspend(struct device *dev)
if (!test_bit(BTMTKSDIO_FUNC_ENABLED, &bdev->tx_state))
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);
--
2.25.1