linux-kernel - [PATCH 3/4] Bluetooth: hci_bcm: Support pcm params in dts

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Date:   Tue,  5 Nov 2019 16:29:22 -0800
From:   Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>
Cc:     linux-bluetooth@...r.kernel.org,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] Bluetooth: hci_bcm: Support pcm params in dts

BCM chips may require configuration of PCM to operate correctly and
there is a vendor specific HCI command to do this. Add support in the
hci_bcm driver to parse this from devicetree and configure the chip.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
---

 drivers/bluetooth/hci_bcm.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 4fe66e52927d..e94908a7e407 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -79,6 +79,7 @@
  * @hu: pointer to HCI UART controller struct,
  *	used to disable flow control during runtime suspend and system sleep
  * @is_suspended: whether flow control is currently disabled
+ * @pcm_params: Bytestring of pcm int and format params.
  */
 struct bcm_device {
 	/* Must be the first member, hci_serdev.c expects this. */
@@ -112,6 +113,9 @@ struct bcm_device {
 	struct hci_uart		*hu;
 	bool			is_suspended;
 #endif
+
+	bool			has_pcm_params;
+	u8			pcm_params[BCM_PCM_PARAMS_COUNT];
 };
 
 /* generic bcm uart resources */
@@ -529,6 +533,8 @@ static int bcm_setup(struct hci_uart *hu)
 	const struct firmware *fw;
 	unsigned int speed;
 	int err;
+	struct bcm_set_pcm_int_params int_params;
+	struct bcm_set_pcm_format_params format_params;
 
 	bt_dev_dbg(hu->hdev, "hu %p", hu);
 
@@ -576,6 +582,23 @@ static int bcm_setup(struct hci_uart *hu)
 			host_set_baudrate(hu, speed);
 	}
 
+	/* PCM parameters if any*/
+	if (bcm->dev && bcm->dev->has_pcm_params) {
+		memcpy(&int_params, &(bcm->dev->pcm_params[0]),
+		       sizeof(int_params));
+		memcpy(&format_params, &(bcm->dev->pcm_params[5]),
+		       sizeof(format_params));
+
+		err = btbcm_set_pcm_params(hu->hdev, &int_params,
+					   &format_params);
+
+		if (err) {
+			bt_dev_info(hu->hdev, "BCM: Set pcm params failed (%d)",
+				    err);
+		}
+
+	}
+
 finalize:
 	release_firmware(fw);
 
@@ -1112,7 +1135,15 @@ static int bcm_acpi_probe(struct bcm_device *dev)
 
 static int bcm_of_probe(struct bcm_device *bdev)
 {
+	int plen;
+
 	device_property_read_u32(bdev->dev, "max-speed", &bdev->oper_speed);
+	plen = device_property_read_u8_array(bdev->dev, "pcm-parameters",
+					     bdev->pcm_params,
+					     BCM_PCM_PARAMS_COUNT);
+	if (plen == 0)
+		bdev->has_pcm_params = true;
+
 	return 0;
 }
 
-- 
2.24.0.rc1.363.gb1bccd3e3d-goog