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![Stephan Gerhold](/assets/img/avatar_default.png)
On most devices using the btqcomsmd driver (e.g. the DragonBoard 410c
and other devices based on the Qualcomm MSM8916/MSM8909/... SoCs)
the Bluetooth firmware seems to become unresponsive for a while after
setting the BD address. On recent kernel versions (at least 5.17+)
this often causes timeouts for subsequent commands, e.g. the HCI reset
sent by the Bluetooth core during initialization:
Bluetooth: hci0: Opcode 0x c03 failed: -110
Unfortunately this behavior does not seem to be documented anywhere.
Experimentation suggests that the minimum necessary delay to avoid
the problem is ~150us. However, to be sure add a sleep for > 1ms
in case it is a bit longer on other firmware versions.
Older kernel versions are likely also affected, although perhaps with
slightly different errors or less probability. Side effects can easily
hide the issue in most cases, e.g. unrelated incoming interrupts that
cause the necessary delay.
Fixes: 1511cc750c
("Bluetooth: Introduce Qualcomm WCNSS SMD based HCI driver")
Signed-off-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
232 lines
4.9 KiB
C
232 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2016, Linaro Ltd.
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* Copyright (c) 2015, Sony Mobile Communications Inc.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/rpmsg.h>
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#include <linux/of.h>
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#include <linux/soc/qcom/wcnss_ctrl.h>
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#include <linux/platform_device.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include "btqca.h"
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struct btqcomsmd {
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struct hci_dev *hdev;
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struct rpmsg_endpoint *acl_channel;
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struct rpmsg_endpoint *cmd_channel;
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};
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static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type,
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const void *data, size_t count)
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{
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struct sk_buff *skb;
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/* Use GFP_ATOMIC as we're in IRQ context */
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skb = bt_skb_alloc(count, GFP_ATOMIC);
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if (!skb) {
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hdev->stat.err_rx++;
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return -ENOMEM;
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}
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hci_skb_pkt_type(skb) = type;
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skb_put_data(skb, data, count);
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return hci_recv_frame(hdev, skb);
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}
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static int btqcomsmd_acl_callback(struct rpmsg_device *rpdev, void *data,
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int count, void *priv, u32 addr)
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{
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struct btqcomsmd *btq = priv;
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btq->hdev->stat.byte_rx += count;
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return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count);
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}
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static int btqcomsmd_cmd_callback(struct rpmsg_device *rpdev, void *data,
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int count, void *priv, u32 addr)
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{
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struct btqcomsmd *btq = priv;
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btq->hdev->stat.byte_rx += count;
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return btqcomsmd_recv(btq->hdev, HCI_EVENT_PKT, data, count);
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}
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static int btqcomsmd_send(struct hci_dev *hdev, struct sk_buff *skb)
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{
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struct btqcomsmd *btq = hci_get_drvdata(hdev);
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int ret;
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switch (hci_skb_pkt_type(skb)) {
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case HCI_ACLDATA_PKT:
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ret = rpmsg_send(btq->acl_channel, skb->data, skb->len);
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if (ret) {
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hdev->stat.err_tx++;
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break;
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}
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hdev->stat.acl_tx++;
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hdev->stat.byte_tx += skb->len;
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break;
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case HCI_COMMAND_PKT:
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ret = rpmsg_send(btq->cmd_channel, skb->data, skb->len);
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if (ret) {
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hdev->stat.err_tx++;
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break;
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}
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hdev->stat.cmd_tx++;
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hdev->stat.byte_tx += skb->len;
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break;
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default:
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ret = -EILSEQ;
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break;
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}
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if (!ret)
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kfree_skb(skb);
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return ret;
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}
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static int btqcomsmd_open(struct hci_dev *hdev)
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{
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return 0;
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}
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static int btqcomsmd_close(struct hci_dev *hdev)
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{
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return 0;
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}
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static int btqcomsmd_setup(struct hci_dev *hdev)
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{
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struct sk_buff *skb;
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skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
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if (IS_ERR(skb))
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return PTR_ERR(skb);
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kfree_skb(skb);
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/* Devices do not have persistent storage for BD address. Retrieve
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* it from the firmware node property.
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*/
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set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
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return 0;
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}
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static int btqcomsmd_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
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{
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int ret;
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ret = qca_set_bdaddr_rome(hdev, bdaddr);
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if (ret)
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return ret;
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/* The firmware stops responding for a while after setting the bdaddr,
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* causing timeouts for subsequent commands. Sleep a bit to avoid this.
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*/
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usleep_range(1000, 10000);
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return 0;
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}
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static int btqcomsmd_probe(struct platform_device *pdev)
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{
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struct btqcomsmd *btq;
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struct hci_dev *hdev;
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void *wcnss;
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int ret;
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btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL);
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if (!btq)
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return -ENOMEM;
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wcnss = dev_get_drvdata(pdev->dev.parent);
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btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL",
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btqcomsmd_acl_callback, btq);
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if (IS_ERR(btq->acl_channel))
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return PTR_ERR(btq->acl_channel);
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btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD",
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btqcomsmd_cmd_callback, btq);
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if (IS_ERR(btq->cmd_channel)) {
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ret = PTR_ERR(btq->cmd_channel);
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goto destroy_acl_channel;
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}
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hdev = hci_alloc_dev();
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if (!hdev) {
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ret = -ENOMEM;
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goto destroy_cmd_channel;
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}
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hci_set_drvdata(hdev, btq);
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btq->hdev = hdev;
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SET_HCIDEV_DEV(hdev, &pdev->dev);
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hdev->bus = HCI_SMD;
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hdev->open = btqcomsmd_open;
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hdev->close = btqcomsmd_close;
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hdev->send = btqcomsmd_send;
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hdev->setup = btqcomsmd_setup;
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hdev->set_bdaddr = btqcomsmd_set_bdaddr;
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ret = hci_register_dev(hdev);
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if (ret < 0)
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goto hci_free_dev;
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platform_set_drvdata(pdev, btq);
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return 0;
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hci_free_dev:
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hci_free_dev(hdev);
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destroy_cmd_channel:
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rpmsg_destroy_ept(btq->cmd_channel);
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destroy_acl_channel:
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rpmsg_destroy_ept(btq->acl_channel);
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return ret;
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}
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static int btqcomsmd_remove(struct platform_device *pdev)
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{
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struct btqcomsmd *btq = platform_get_drvdata(pdev);
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hci_unregister_dev(btq->hdev);
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hci_free_dev(btq->hdev);
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rpmsg_destroy_ept(btq->cmd_channel);
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rpmsg_destroy_ept(btq->acl_channel);
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return 0;
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}
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static const struct of_device_id btqcomsmd_of_match[] = {
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{ .compatible = "qcom,wcnss-bt", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, btqcomsmd_of_match);
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static struct platform_driver btqcomsmd_driver = {
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.probe = btqcomsmd_probe,
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.remove = btqcomsmd_remove,
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.driver = {
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.name = "btqcomsmd",
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.of_match_table = btqcomsmd_of_match,
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},
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};
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module_platform_driver(btqcomsmd_driver);
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MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
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MODULE_DESCRIPTION("Qualcomm SMD HCI driver");
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MODULE_LICENSE("GPL v2");
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