From patchwork Sat Jan 29 06:02:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 12729389 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 931E7C433EF for ; Sat, 29 Jan 2022 06:02:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239129AbiA2GCP (ORCPT ); Sat, 29 Jan 2022 01:02:15 -0500 Received: from mailgw02.mediatek.com ([210.61.82.184]:49852 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S238600AbiA2GCO (ORCPT ); Sat, 29 Jan 2022 01:02:14 -0500 X-UUID: 4bd9a8234c1144a3a80b3c6fcca80ec0-20220129 X-UUID: 4bd9a8234c1144a3a80b3c6fcca80ec0-20220129 Received: from mtkmbs10n2.mediatek.inc [(172.21.101.183)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1190797187; Sat, 29 Jan 2022 14:02:11 +0800 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Sat, 29 Jan 2022 14:02:10 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Sat, 29 Jan 2022 14:02:10 +0800 From: To: , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , Chih-Ying Chiang , Mark Chen Subject: [PATCH 1/2] Bluetooth: mt7921s: support bluetooth reset mechanism Date: Sat, 29 Jan 2022 14:02:07 +0800 Message-ID: <52ae30c33f2994efcdff180764801141d59e6e0c.1643435854.git.objelf@gmail.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Chih-Ying Chiang 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 Signed-off-by: Mark Chen Co-developed-by: Sean Wang Signed-off-by: Sean Wang Signed-off-by: Chih-Ying Chiang --- 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 #include +#include #include #include #include #include +#include #include #include @@ -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; }