linux-kernel - [PATCH 1/4] Bluetooth: hci_bcm: Disallow set

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Message-Id: <20191106002923.109344-2-abhishekpandit@chromium.org>
Date:   Tue,  5 Nov 2019 16:29:20 -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 1/4] Bluetooth: hci_bcm: Disallow set_baudrate for BCM4354

Without updating the patchram, the BCM4354 does not support a higher
operating speed. The normal bcm_setup follows the correct order
(init_speed, patchram and then oper_speed) but the serdev driver will
set the operating speed before calling the hu->setup function. Thus,
for the BCM4354, disallow setting the operating speed before patchram.

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

 drivers/bluetooth/hci_bcm.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 0f851c0dde7f..4fe66e52927d 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -1167,7 +1167,7 @@ static int bcm_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct hci_uart_proto bcm_proto = {
+static struct hci_uart_proto bcm_proto = {
 	.id		= HCI_UART_BCM,
 	.name		= "Broadcom",
 	.manufacturer	= 15,
@@ -1371,6 +1371,22 @@ static struct platform_driver bcm_driver = {
 	},
 };
 
+static int bcm_check_disallow_set_baudrate(struct serdev_device *serdev)
+{
+	const char *compatible = of_get_property(serdev->dev.of_node,
+						 "compatible", NULL);
+
+	if (compatible) {
+		/* BCM4354 can't run at full speed before patchram. Disallow
+		 * externally setting operating speed.
+		 */
+		if (!strcmp(compatible, "brcm,bcm43540-bt"))
+			return 1;
+	}
+
+	return 0;
+}
+
 static int bcm_serdev_probe(struct serdev_device *serdev)
 {
 	struct bcm_device *bcmdev;
@@ -1408,6 +1424,9 @@ static int bcm_serdev_probe(struct serdev_device *serdev)
 	if (err)
 		dev_err(&serdev->dev, "Failed to power down\n");
 
+	if (bcm_check_disallow_set_baudrate(serdev))
+		bcm_proto.set_baudrate = NULL;
+
 	return hci_uart_register_device(&bcmdev->serdev_hu, &bcm_proto);
 }
 
-- 
2.24.0.rc1.363.gb1bccd3e3d-goog