[PATCH v2 1/2] Bluetooth: Bluetooth: btmtksdio: handle runtime pm only when sdio_func is available

[PATCH v2 1/2] Bluetooth: Bluetooth: btmtksdio: handle runtime pm only when sdio_func is available

[sean.wang]

From: Sean Wang <sean.wang@mediatek.com>

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 <mark-yw.chen@mediatek.com>
Signed-off-by: Mark-yw Chen <mark-yw.chen@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
---
v2: not check HCI_RUNNING from a driver, use an internal flag instead
---
 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

[PATCH v2 2/2] Bluetooth: btmtksdio: fix resume failure

[sean.wang]

From: Sean Wang <sean.wang@mediatek.com>

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@mediatek.com>
Signed-off-by: Mark-yw Chen <mark-yw.chen@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
---
v2: rebase and resend
---
 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

Re: [PATCH v2 1/2] Bluetooth: Bluetooth: btmtksdio: handle runtime pm only when sdio_func is available

[Marcel Holtmann]

Hi Sean,

> 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 <mark-yw.chen@mediatek.com>
> Signed-off-by: Mark-yw Chen <mark-yw.chen@mediatek.com>
> Signed-off-by: Sean Wang <sean.wang@mediatek.com>
> ---
> v2: not check HCI_RUNNING from a driver, use an internal flag instead
> ---
> drivers/bluetooth/btmtksdio.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)

patch has been applied to bluetooth-next tree.

Regards

Marcel

Re: [PATCH v2 2/2] Bluetooth: btmtksdio: fix resume failure

[Marcel Holtmann]

Hi Sean,

> 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@mediatek.com>
> Signed-off-by: Mark-yw Chen <mark-yw.chen@mediatek.com>
> Signed-off-by: Sean Wang <sean.wang@mediatek.com>
> ---
> v2: rebase and resend
> ---
> drivers/bluetooth/btmtksdio.c | 2 ++
> 1 file changed, 2 insertions(+)

patch has been applied to bluetooth-next tree.

Regards

Marcel