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Subject[PATCH v3 1/3] Bluetooth: hci_h5: add WAKEUP_DISABLE flag
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From: Archie Pusaka <apusaka@chromium.org>

Some RTL chips resets the FW on suspend, so wakeup is disabled on
those chips. This patch introduces this WAKEUP_DISABLE flag so that
chips that doesn't reset FW on suspend can leave the flag unset and
is allowed to wake the host.

This patch also left RTL8822 WAKEUP_DISABLE flag unset, therefore
allowing it to wake the host, and preventing reprobing on resume.

Signed-off-by: Archie Pusaka <apusaka@chromium.org>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Reviewed-by: Hilda Wu <hildawu@realtek.com>

---

Changes in v3:
* Rebasing

Changes in v2:
* Remove unnecessary variable

drivers/bluetooth/hci_h5.c | 83 +++++++++++++++++++++++++++-----------
1 file changed, 59 insertions(+), 24 deletions(-)

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 7b985c7cd26d..fd672111a048 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -51,8 +51,9 @@

/* H5 state flags */
enum {
- H5_RX_ESC, /* SLIP escape mode */
- H5_TX_ACK_REQ, /* Pending ack to send */
+ H5_RX_ESC, /* SLIP escape mode */
+ H5_TX_ACK_REQ, /* Pending ack to send */
+ H5_WAKEUP_DISABLE, /* Device cannot wake host */
};

struct h5 {
@@ -97,6 +98,10 @@ struct h5 {
struct gpio_desc *device_wake_gpio;
};

+enum h5_driver_info {
+ H5_INFO_WAKEUP_DISABLE = BIT(0),
+};
+
struct h5_vnd {
int (*setup)(struct h5 *h5);
void (*open)(struct h5 *h5);
@@ -106,6 +111,11 @@ struct h5_vnd {
const struct acpi_gpio_mapping *acpi_gpio_map;
};

+struct h5_device_data {
+ uint32_t driver_info;
+ struct h5_vnd *vnd;
+};
+
static void h5_reset_rx(struct h5 *h5);

static void h5_link_control(struct hci_uart *hu, const void *data, size_t len)
@@ -791,6 +801,8 @@ static int h5_serdev_probe(struct serdev_device *serdev)
{
struct device *dev = &serdev->dev;
struct h5 *h5;
+ const struct h5_device_data *data;
+ int err;

h5 = devm_kzalloc(dev, sizeof(*h5), GFP_KERNEL);
if (!h5)
@@ -807,20 +819,19 @@ static int h5_serdev_probe(struct serdev_device *serdev)
if (!match)
return -ENODEV;

- h5->vnd = (const struct h5_vnd *)match->driver_data;
+ data = (const struct h5_device_data *)match->driver_data;
+ h5->vnd = data->vnd;
h5->id = (char *)match->id;

if (h5->vnd->acpi_gpio_map)
devm_acpi_dev_add_driver_gpios(dev,
h5->vnd->acpi_gpio_map);
} else {
- const void *data;
-
data = of_device_get_match_data(dev);
if (!data)
return -ENODEV;

- h5->vnd = (const struct h5_vnd *)data;
+ h5->vnd = data->vnd;
}


@@ -833,7 +844,14 @@ static int h5_serdev_probe(struct serdev_device *serdev)
if (IS_ERR(h5->device_wake_gpio))
return PTR_ERR(h5->device_wake_gpio);

- return hci_uart_register_device(&h5->serdev_hu, &h5p);
+ err = hci_uart_register_device(&h5->serdev_hu, &h5p);
+ if (err)
+ return err;
+
+ if (data->driver_info & H5_INFO_WAKEUP_DISABLE)
+ set_bit(H5_WAKEUP_DISABLE, &h5->flags);
+
+ return 0;
}

static void h5_serdev_remove(struct serdev_device *serdev)
@@ -921,7 +939,8 @@ static void h5_btrtl_open(struct h5 *h5)
* done by the hci_suspend_notifier is not necessary; it actually causes
* delays and a bunch of errors to get logged, so disable it.
*/
- set_bit(HCI_UART_NO_SUSPEND_NOTIFIER, &h5->hu->flags);
+ if (test_bit(H5_WAKEUP_DISABLE, &h5->flags))
+ set_bit(HCI_UART_NO_SUSPEND_NOTIFIER, &h5->hu->flags);

/* Devices always start with these fixed parameters */
serdev_device_set_flow_control(h5->hu->serdev, false);
@@ -942,15 +961,18 @@ static void h5_btrtl_close(struct h5 *h5)

/* Suspend/resume support. On many devices the RTL BT device loses power during
* suspend/resume, causing it to lose its firmware and all state. So we simply
- * turn it off on suspend and reprobe on resume. This mirrors how RTL devices
- * are handled in the USB driver, where the USB_QUIRK_RESET_RESUME is used which
+ * turn it off on suspend and reprobe on resume. This mirrors how RTL devices
+ * are handled in the USB driver, where the BTUSB_WAKEUP_DISABLE is used which
* also causes a reprobe on resume.
*/
static int h5_btrtl_suspend(struct h5 *h5)
{
serdev_device_set_flow_control(h5->hu->serdev, false);
gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
- gpiod_set_value_cansleep(h5->enable_gpio, 0);
+
+ if (test_bit(H5_WAKEUP_DISABLE, &h5->flags))
+ gpiod_set_value_cansleep(h5->enable_gpio, 0);
+
return 0;
}

@@ -976,17 +998,21 @@ static void h5_btrtl_reprobe_worker(struct work_struct *work)

static int h5_btrtl_resume(struct h5 *h5)
{
- struct h5_btrtl_reprobe *reprobe;
+ if (test_bit(H5_WAKEUP_DISABLE, &h5->flags)) {
+ struct h5_btrtl_reprobe *reprobe;

- reprobe = kzalloc(sizeof(*reprobe), GFP_KERNEL);
- if (!reprobe)
- return -ENOMEM;
+ reprobe = kzalloc(sizeof(*reprobe), GFP_KERNEL);
+ if (!reprobe)
+ return -ENOMEM;

- __module_get(THIS_MODULE);
+ __module_get(THIS_MODULE);

- INIT_WORK(&reprobe->work, h5_btrtl_reprobe_worker);
- reprobe->dev = get_device(&h5->hu->serdev->dev);
- queue_work(system_long_wq, &reprobe->work);
+ INIT_WORK(&reprobe->work, h5_btrtl_reprobe_worker);
+ reprobe->dev = get_device(&h5->hu->serdev->dev);
+ queue_work(system_long_wq, &reprobe->work);
+ } else {
+ gpiod_set_value_cansleep(h5->device_wake_gpio, 1);
+ }
return 0;
}

@@ -1008,13 +1034,22 @@ static struct h5_vnd rtl_vnd = {
.resume = h5_btrtl_resume,
.acpi_gpio_map = acpi_btrtl_gpios,
};
+
+static const struct h5_device_data h5_data_rtl8822cs = {
+ .vnd = &rtl_vnd,
+};
+
+static const struct h5_device_data h5_data_rtl8723bs = {
+ .driver_info = H5_INFO_WAKEUP_DISABLE,
+ .vnd = &rtl_vnd,
+};
#endif

#ifdef CONFIG_ACPI
static const struct acpi_device_id h5_acpi_match[] = {
#ifdef CONFIG_BT_HCIUART_RTL
- { "OBDA0623", (kernel_ulong_t)&rtl_vnd },
- { "OBDA8723", (kernel_ulong_t)&rtl_vnd },
+ { "OBDA0623", (kernel_ulong_t)&h5_data_rtl8723bs },
+ { "OBDA8723", (kernel_ulong_t)&h5_data_rtl8723bs },
#endif
{ },
};
@@ -1028,11 +1063,11 @@ static const struct dev_pm_ops h5_serdev_pm_ops = {
static const struct of_device_id rtl_bluetooth_of_match[] = {
#ifdef CONFIG_BT_HCIUART_RTL
{ .compatible = "realtek,rtl8822cs-bt",
- .data = (const void *)&rtl_vnd },
+ .data = (const void *)&h5_data_rtl8822cs },
{ .compatible = "realtek,rtl8723bs-bt",
- .data = (const void *)&rtl_vnd },
+ .data = (const void *)&h5_data_rtl8723bs },
{ .compatible = "realtek,rtl8723ds-bt",
- .data = (const void *)&rtl_vnd },
+ .data = (const void *)&h5_data_rtl8723bs },
#endif
{ },
};
--
2.32.0.432.gabb21c7263-goog
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