Re: [PATCH v1] Bluetooth: hci_qca: Make bt_en and susclk not mandatory for QCA Rome

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在 2020-03-04 16:53,Johan Hovold 写道:
On Wed, Mar 04, 2020 at 09:54:29AM +0800, Rocky Liao wrote:
On some platforms the bt_en pin and susclk are default on and there
is no exposed resource to control them. This patch makes the bt_en
and susclk not mandatory to have BT work. It also will not set the
HCI_QUIRK_NON_PERSISTENT_SETUP and shutdown() callback if bt_en is
not available.

Signed-off-by: Rocky Liao <rjliao@xxxxxxxxxxxxxx>
---
drivers/bluetooth/hci_qca.c | 47 ++++++++++++++++++++-----------------
 1 file changed, 26 insertions(+), 21 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index bf436d6e638e..325baa046c3a 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -1562,9 +1562,11 @@ static int qca_power_on(struct hci_dev *hdev)
 		ret = qca_wcn3990_init(hu);
 	} else {
 		qcadev = serdev_device_get_drvdata(hu->serdev);
-		gpiod_set_value_cansleep(qcadev->bt_en, 1);
-		/* Controller needs time to bootup. */
-		msleep(150);
+		if (!IS_ERR(qcadev->bt_en)) {
+			gpiod_set_value_cansleep(qcadev->bt_en, 1);
+			/* Controller needs time to bootup. */
+			msleep(150);
+		}
 	}

 	return ret;
@@ -1750,7 +1752,7 @@ static void qca_power_shutdown(struct hci_uart *hu)
 		host_set_baudrate(hu, 2400);
 		qca_send_power_pulse(hu, false);
 		qca_regulator_disable(qcadev);
-	} else {
+	} else if (!IS_ERR(qcadev->bt_en)) {
 		gpiod_set_value_cansleep(qcadev->bt_en, 0);
 	}
 }
@@ -1852,6 +1854,7 @@ static int qca_serdev_probe(struct serdev_device *serdev)
 	struct hci_dev *hdev;
 	const struct qca_vreg_data *data;
 	int err;
+	bool power_ctrl_enabled = true;

 	qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
 	if (!qcadev)
@@ -1901,35 +1904,37 @@ static int qca_serdev_probe(struct serdev_device *serdev)
 		qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
 					       GPIOD_OUT_LOW);

Shouldn't you use devm_gpiod_get_optional()?

 		if (IS_ERR(qcadev->bt_en)) {
-			dev_err(&serdev->dev, "failed to acquire enable gpio\n");
-			return PTR_ERR(qcadev->bt_en);
+			dev_warn(&serdev->dev, "failed to acquire enable gpio\n");
+			power_ctrl_enabled = false;

And bail out on errors, but treat NULL as !port_ctrl_enabled?

 		}

 		qcadev->susclk = devm_clk_get(&serdev->dev, NULL);

And devm_clk_get_optional() here.

Etc.

Also does the devicetree binding need to be updated to reflect this
change?

OK, I will update to use the suggested API.
The devicetress binding doesn't need to be updated as they are already optional there.

Johan



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