From a430c2a10c743dab5a3a07bc4e9544c55bd010fd Mon Sep 17 00:00:00 2001 From: Kiran K Date: Tue, 1 Oct 2024 16:14:51 +0530 Subject: [PATCH] Bluetooth: btintel_pcie: Add recovery mechanism This patch adds a recovery mechanism to recover controller if firmware download fails due to unresponsive controller, command timeout, firmware signature verification failure etc. Driver attmepts maximum of 5 times before giving up. Signed-off-by: Kiran K Signed-off-by: Luiz Augusto von Dentz --- drivers/bluetooth/btintel.c | 14 ++++ drivers/bluetooth/btintel_pcie.c | 109 +++++++++++++++++++++---------- drivers/bluetooth/btintel_pcie.h | 2 + 3 files changed, 91 insertions(+), 34 deletions(-) diff --git a/drivers/bluetooth/btintel.c b/drivers/bluetooth/btintel.c index c9df27f3b80e..c34ff4e1a893 100644 --- a/drivers/bluetooth/btintel.c +++ b/drivers/bluetooth/btintel.c @@ -1252,6 +1252,12 @@ static void btintel_reset_to_bootloader(struct hci_dev *hdev) struct intel_reset params; struct sk_buff *skb; + /* PCIe transport uses shared hardware reset mechanism for recovery + * which gets triggered in pcie *setup* function on error. + */ + if (hdev->bus == HCI_PCI) + return; + /* Send Intel Reset command. This will result in * re-enumeration of BT controller. * @@ -1267,6 +1273,7 @@ static void btintel_reset_to_bootloader(struct hci_dev *hdev) * boot_param: Boot address * */ + params.reset_type = 0x01; params.patch_enable = 0x01; params.ddc_reload = 0x01; @@ -2796,6 +2803,13 @@ int btintel_bootloader_setup_tlv(struct hci_dev *hdev, */ boot_param = 0x00000000; + /* In case of PCIe, this function might get called multiple times with + * same hdev instance if there is any error on firmware download. + * Need to clear stale bits of previous firmware download attempt. + */ + for (int i = 0; i < __INTEL_NUM_FLAGS; i++) + btintel_clear_flag(hdev, i); + btintel_set_flag(hdev, INTEL_BOOTLOADER); err = btintel_prepare_fw_download_tlv(hdev, ver, &boot_param); diff --git a/drivers/bluetooth/btintel_pcie.c b/drivers/bluetooth/btintel_pcie.c index 16ee962d4086..e4ae8c898dfd 100644 --- a/drivers/bluetooth/btintel_pcie.c +++ b/drivers/bluetooth/btintel_pcie.c @@ -75,24 +75,6 @@ static inline void ipc_print_urbd1(struct hci_dev *hdev, struct urbd1 *urbd1, index, urbd1->frbd_tag, urbd1->status, urbd1->fixed); } -static int btintel_pcie_poll_bit(struct btintel_pcie_data *data, u32 offset, - u32 bits, u32 mask, int timeout_us) -{ - int t = 0; - u32 reg; - - do { - reg = btintel_pcie_rd_reg32(data, offset); - - if ((reg & mask) == (bits & mask)) - return t; - udelay(POLL_INTERVAL_US); - t += POLL_INTERVAL_US; - } while (t < timeout_us); - - return -ETIMEDOUT; -} - static struct btintel_pcie_data *btintel_pcie_get_data(struct msix_entry *entry) { u8 queue = entry->entry; @@ -248,10 +230,47 @@ static void btintel_pcie_reset_ia(struct btintel_pcie_data *data) memset(data->ia.cr_tia, 0, sizeof(u16) * BTINTEL_PCIE_NUM_QUEUES); } -static void btintel_pcie_reset_bt(struct btintel_pcie_data *data) +static int btintel_pcie_reset_bt(struct btintel_pcie_data *data) { - btintel_pcie_wr_reg32(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG, - BTINTEL_PCIE_CSR_FUNC_CTRL_SW_RESET); + u32 reg; + int retry = 3; + + reg = btintel_pcie_rd_reg32(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG); + + reg &= ~(BTINTEL_PCIE_CSR_FUNC_CTRL_FUNC_ENA | + BTINTEL_PCIE_CSR_FUNC_CTRL_MAC_INIT | + BTINTEL_PCIE_CSR_FUNC_CTRL_FUNC_INIT); + reg |= BTINTEL_PCIE_CSR_FUNC_CTRL_BUS_MASTER_DISCON; + + btintel_pcie_wr_reg32(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG, reg); + + do { + reg = btintel_pcie_rd_reg32(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG); + if (reg & BTINTEL_PCIE_CSR_FUNC_CTRL_BUS_MASTER_STS) + break; + usleep_range(10000, 12000); + + } while (--retry > 0); + usleep_range(10000, 12000); + + reg = btintel_pcie_rd_reg32(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG); + + reg &= ~(BTINTEL_PCIE_CSR_FUNC_CTRL_FUNC_ENA | + BTINTEL_PCIE_CSR_FUNC_CTRL_MAC_INIT | + BTINTEL_PCIE_CSR_FUNC_CTRL_FUNC_INIT); + reg |= BTINTEL_PCIE_CSR_FUNC_CTRL_SW_RESET; + btintel_pcie_wr_reg32(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG, reg); + usleep_range(10000, 12000); + + reg = btintel_pcie_rd_reg32(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG); + bt_dev_dbg(data->hdev, "csr register after reset: 0x%8.8x", reg); + + reg = btintel_pcie_rd_reg32(data, BTINTEL_PCIE_CSR_BOOT_STAGE_REG); + + /* If shared hardware reset is success then boot stage register shall be + * set to 0 + */ + return reg == 0 ? 0 : -ENODEV; } /* This function enables BT function by setting BTINTEL_PCIE_CSR_FUNC_CTRL_MAC_INIT bit in @@ -263,6 +282,7 @@ static void btintel_pcie_reset_bt(struct btintel_pcie_data *data) static int btintel_pcie_enable_bt(struct btintel_pcie_data *data) { int err; + u32 reg; data->gp0_received = false; @@ -278,22 +298,17 @@ static int btintel_pcie_enable_bt(struct btintel_pcie_data *data) data->boot_stage_cache = 0x0; /* Set MAC_INIT bit to start primary bootloader */ - btintel_pcie_rd_reg32(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG); + reg = btintel_pcie_rd_reg32(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG); + reg &= ~(BTINTEL_PCIE_CSR_FUNC_CTRL_FUNC_INIT | + BTINTEL_PCIE_CSR_FUNC_CTRL_BUS_MASTER_DISCON | + BTINTEL_PCIE_CSR_FUNC_CTRL_SW_RESET); + reg |= (BTINTEL_PCIE_CSR_FUNC_CTRL_FUNC_ENA | + BTINTEL_PCIE_CSR_FUNC_CTRL_MAC_INIT); - btintel_pcie_set_reg_bits(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG, - BTINTEL_PCIE_CSR_FUNC_CTRL_MAC_INIT); - - /* Wait until MAC_ACCESS is granted */ - err = btintel_pcie_poll_bit(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG, - BTINTEL_PCIE_CSR_FUNC_CTRL_MAC_ACCESS_STS, - BTINTEL_PCIE_CSR_FUNC_CTRL_MAC_ACCESS_STS, - BTINTEL_DEFAULT_MAC_ACCESS_TIMEOUT_US); - if (err < 0) - return -ENODEV; + btintel_pcie_wr_reg32(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG, reg); /* MAC is ready. Enable BT FUNC */ btintel_pcie_set_reg_bits(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG, - BTINTEL_PCIE_CSR_FUNC_CTRL_FUNC_ENA | BTINTEL_PCIE_CSR_FUNC_CTRL_FUNC_INIT); btintel_pcie_rd_reg32(data, BTINTEL_PCIE_CSR_FUNC_CTRL_REG); @@ -1376,7 +1391,7 @@ static void btintel_pcie_release_hdev(struct btintel_pcie_data *data) data->hdev = NULL; } -static int btintel_pcie_setup(struct hci_dev *hdev) +static int btintel_pcie_setup_internal(struct hci_dev *hdev) { const u8 param[1] = { 0xFF }; struct intel_version_tlv ver_tlv; @@ -1467,6 +1482,32 @@ static int btintel_pcie_setup(struct hci_dev *hdev) return err; } +static int btintel_pcie_setup(struct hci_dev *hdev) +{ + int err, fw_dl_retry = 0; + struct btintel_pcie_data *data = hci_get_drvdata(hdev); + + while ((err = btintel_pcie_setup_internal(hdev)) && fw_dl_retry++ < 1) { + bt_dev_err(hdev, "Firmware download retry count: %d", + fw_dl_retry); + err = btintel_pcie_reset_bt(data); + if (err) { + bt_dev_err(hdev, "Failed to do shr reset: %d", err); + break; + } + usleep_range(10000, 12000); + btintel_pcie_reset_ia(data); + btintel_pcie_config_msix(data); + err = btintel_pcie_enable_bt(data); + if (err) { + bt_dev_err(hdev, "Failed to enable hardware: %d", err); + break; + } + btintel_pcie_start_rx(data); + } + return err; +} + static int btintel_pcie_setup_hdev(struct btintel_pcie_data *data) { int err; diff --git a/drivers/bluetooth/btintel_pcie.h b/drivers/bluetooth/btintel_pcie.h index 8b7824ad005a..f9aada0543c4 100644 --- a/drivers/bluetooth/btintel_pcie.h +++ b/drivers/bluetooth/btintel_pcie.h @@ -23,6 +23,8 @@ #define BTINTEL_PCIE_CSR_FUNC_CTRL_MAC_INIT (BIT(6)) #define BTINTEL_PCIE_CSR_FUNC_CTRL_FUNC_INIT (BIT(7)) #define BTINTEL_PCIE_CSR_FUNC_CTRL_MAC_ACCESS_STS (BIT(20)) +#define BTINTEL_PCIE_CSR_FUNC_CTRL_BUS_MASTER_STS (BIT(28)) +#define BTINTEL_PCIE_CSR_FUNC_CTRL_BUS_MASTER_DISCON (BIT(29)) #define BTINTEL_PCIE_CSR_FUNC_CTRL_SW_RESET (BIT(31)) /* Value for BTINTEL_PCIE_CSR_BOOT_STAGE register */