[PATCH 1/2] Bluetooth: mt7921s: support bluetooth reset mechanism
sean.wang at mediatek.com
sean.wang at mediatek.com
Fri Jan 28 22:02:07 PST 2022
From: Chih-Ying Chiang <chih-yin.chiang at mediatek.com>
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 at mediatek.com>
Signed-off-by: Mark Chen <mark-yw.chen at mediatek.com>
Co-developed-by: Sean Wang <sean.wang at mediatek.com>
Signed-off-by: Sean Wang <sean.wang at mediatek.com>
Signed-off-by: Chih-Ying Chiang <chih-yin.chiang at mediatek.com>
---
drivers/bluetooth/btmtk.h | 6 ++
drivers/bluetooth/btmtksdio.c | 113 +++++++++++++++++++++++++++++++++-
2 files changed, 118 insertions(+), 1 deletion(-)
diff --git a/drivers/bluetooth/btmtk.h b/drivers/bluetooth/btmtk.h
index fb76d9765ce0..8960a5f89d48 100644
--- a/drivers/bluetooth/btmtk.h
+++ b/drivers/bluetooth/btmtk.h
@@ -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,
diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index 8be763ab3bf4..8e200e80d2f6 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -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;
}
--
2.25.1
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