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Bluetooth: mt7921s: support bluetooth reset mechanism

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Implement .cmd_timeout to reset the MT7921s device via a dedicated GPIO
pin when the firmware hang or the command has no response.

Co-developed-by: Mark Chen <mark-yw.chen@mediatek.com>
Signed-off-by: Mark Chen <mark-yw.chen@mediatek.com>
Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Chih-Ying Chiang <chih-yin.chiang@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Chih-Ying Chiang 2022-02-09 02:17:40 +08:00 committed by Marcel Holtmann
parent e616fec63f
commit 8fafe70225
2 changed files with 118 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/bluetooth/btmtk.h
View file

@ -10,9 +10,15 @@
#define BTMTK_WMT_REG_WRITE 0x1
#define BTMTK_WMT_REG_READ 0x2
#define MT7921_BTSYS_RST 0x70002610
#define MT7921_BTSYS_RST_WITH_GPIO BIT(7)
#define MT7921_PINMUX_0 0x70005050
#define MT7921_PINMUX_1 0x70005054
#define MT7921_DLSTATUS 0x7c053c10
#define BT_DL_STATE BIT(1)
enum {
BTMTK_WMT_PATCH_DWNLD = 0x1,
BTMTK_WMT_TEST = 0x2,

113
drivers/bluetooth/btmtksdio.c
View file

@ -12,10 +12,12 @@
#include <asm/unaligned.h>
#include <linux/atomic.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm_runtime.h>
#include <linux/skbuff.h>
@ -83,6 +85,7 @@ MODULE_DEVICE_TABLE(sdio, btmtksdio_table);
#define MTK_REG_CHCR 0xc
#define C_INT_CLR_CTRL BIT(1)
#define BT_RST_DONE BIT(8)
/* CHISR have the same bits field definition with CHIER */
#define MTK_REG_CHISR 0x10
@ -114,6 +117,7 @@ MODULE_DEVICE_TABLE(sdio, btmtksdio_table);
#define BTMTKSDIO_HW_TX_READY 2
#define BTMTKSDIO_FUNC_ENABLED 3
#define BTMTKSDIO_PATCH_ENABLED 4
#define BTMTKSDIO_HW_RESET_ACTIVE 5
struct mtkbtsdio_hdr {
__le16 len;
@ -133,6 +137,8 @@ struct btmtksdio_dev {
struct sk_buff *evt_skb;
const struct btmtksdio_data *data;
struct gpio_desc *reset;
};
static int mtk_hci_wmt_sync(struct hci_dev *hdev,
@ -297,6 +303,11 @@ static u32 btmtksdio_drv_own_query_79xx(struct btmtksdio_dev *bdev)
return sdio_readl(bdev->func, MTK_REG_PD2HRM0R, NULL);
}
static u32 btmtksdio_chcr_query(struct btmtksdio_dev *bdev)
{
return sdio_readl(bdev->func, MTK_REG_CHCR, NULL);
}
static int btmtksdio_fw_pmctrl(struct btmtksdio_dev *bdev)
{
u32 status;
@ -967,6 +978,28 @@ static int btmtksdio_sco_setting(struct hci_dev *hdev)
return btmtksdio_mtk_reg_write(hdev, MT7921_PINMUX_1, val, ~0);
}
static int btmtksdio_reset_setting(struct hci_dev *hdev)
{
int err;
u32 val;
err = btmtksdio_mtk_reg_read(hdev, MT7921_PINMUX_1, &val);
if (err < 0)
return err;
val |= 0x20; /* set the pin (bit field 11:8) work as GPIO mode */
err = btmtksdio_mtk_reg_write(hdev, MT7921_PINMUX_1, val, ~0);
if (err < 0)
return err;
err = btmtksdio_mtk_reg_read(hdev, MT7921_BTSYS_RST, &val);
if (err < 0)
return err;
val |= MT7921_BTSYS_RST_WITH_GPIO;
return btmtksdio_mtk_reg_write(hdev, MT7921_BTSYS_RST, val, ~0);
}
static int btmtksdio_setup(struct hci_dev *hdev)
{
struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
@ -974,13 +1007,32 @@ static int btmtksdio_setup(struct hci_dev *hdev)
unsigned long long duration;
char fwname[64];
int err, dev_id;
u32 fw_version = 0;
u32 fw_version = 0, val;
calltime = ktime_get();
set_bit(BTMTKSDIO_HW_TX_READY, &bdev->tx_state);
switch (bdev->data->chipid) {
case 0x7921:
if (test_bit(BTMTKSDIO_HW_RESET_ACTIVE, &bdev->tx_state)) {
err = btmtksdio_mtk_reg_read(hdev, MT7921_DLSTATUS,
&val);
if (err < 0)
return err;
val &= ~BT_DL_STATE;
err = btmtksdio_mtk_reg_write(hdev, MT7921_DLSTATUS,
val, ~0);
if (err < 0)
return err;
btmtksdio_fw_pmctrl(bdev);
msleep(20);
btmtksdio_drv_pmctrl(bdev);
clear_bit(BTMTKSDIO_HW_RESET_ACTIVE, &bdev->tx_state);
}
err = btmtksdio_mtk_reg_read(hdev, 0x70010200, &dev_id);
if (err < 0) {
bt_dev_err(hdev, "Failed to get device id (%d)", err);
@ -1015,6 +1067,16 @@ static int btmtksdio_setup(struct hci_dev *hdev)
return err;
}
/* Enable GPIO reset mechanism */
if (bdev->reset) {
err = btmtksdio_reset_setting(hdev);
if (err < 0) {
bt_dev_err(hdev, "Failed to enable Reset setting (%d)", err);
devm_gpiod_put(bdev->dev, bdev->reset);
bdev->reset = NULL;
}
}
break;
case 0x7663:
case 0x7668:
@ -1111,6 +1173,47 @@ static int btmtksdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
return 0;
}
static void btmtksdio_cmd_timeout(struct hci_dev *hdev)
{
struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
u32 status;
int err;
if (!bdev->reset || bdev->data->chipid != 0x7921)
return;
pm_runtime_get_sync(bdev->dev);
if (test_and_set_bit(BTMTKSDIO_HW_RESET_ACTIVE, &bdev->tx_state))
return;
sdio_claim_host(bdev->func);
sdio_writel(bdev->func, C_INT_EN_CLR, MTK_REG_CHLPCR, NULL);
skb_queue_purge(&bdev->txq);
cancel_work_sync(&bdev->txrx_work);
gpiod_set_value_cansleep(bdev->reset, 1);
msleep(100);
gpiod_set_value_cansleep(bdev->reset, 0);
err = readx_poll_timeout(btmtksdio_chcr_query, bdev, status,
status & BT_RST_DONE, 100000, 2000000);
if (err < 0) {
bt_dev_err(hdev, "Failed to reset (%d)", err);
goto err;
}
clear_bit(BTMTKSDIO_PATCH_ENABLED, &bdev->tx_state);
err:
sdio_release_host(bdev->func);
pm_runtime_put_noidle(bdev->dev);
pm_runtime_disable(bdev->dev);
hci_reset_dev(hdev);
}
static bool btmtksdio_sdio_wakeup(struct hci_dev *hdev)
{
struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
@ -1172,6 +1275,7 @@ static int btmtksdio_probe(struct sdio_func *func,
hdev->open = btmtksdio_open;
hdev->close = btmtksdio_close;
hdev->cmd_timeout = btmtksdio_cmd_timeout;
hdev->flush = btmtksdio_flush;
hdev->setup = btmtksdio_setup;
hdev->shutdown = btmtksdio_shutdown;
@ -1216,6 +1320,13 @@ static int btmtksdio_probe(struct sdio_func *func,
if (err)
bt_dev_err(hdev, "failed to initialize device wakeup");
bdev->dev->of_node = of_find_compatible_node(NULL, NULL,
"mediatek,mt7921s-bluetooth");
bdev->reset = devm_gpiod_get_optional(bdev->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(bdev->reset))
err = PTR_ERR(bdev->reset);
return err;
}