kernel/linux.git/drivers/bluetooth/btintel_pcie.h, branch linux-7.1.y

Bluetooth: btintel_pcie: Fix incorrect MAC access programming

2026-05-20T20:35:47+00:00

btintel_pcie_get_mac_access() and btintel_pcie_release_mac_access() were programming STOP_MAC_ACCESS_DIS and XTAL_CLK_REQ in addition to the MAC_ACCESS_REQ handshake. These bits are not part of the host MAC-access handshake on the supported parts; the driver was programming them incorrectly. Drop the writes so the register update contains only the bits the controller actually consumes. Fixes: b9465e6670a2 ("Bluetooth: btintel_pcie: Read hardware exception data") Signed-off-by: Kiran K Signed-off-by: Luiz Augusto von Dentz

Bluetooth: btintel_pcie: treat boot stage bit 12 as warning

2026-05-06T20:21:34+00:00

CSR boot stage register bit 12 is documented as a device warning, not a fatal error. Rename the bit definition accordingly and stop including it in btintel_pcie_in_error(). This keeps warning-only boot stage values from being classified as errors while preserving abort-handler state as the actual error condition. Fixes: 190377500fde ("Bluetooth: btintel_pcie: Dump debug registers on error") Signed-off-by: Kiran K Signed-off-by: Sai Teja Aluvala Signed-off-by: Luiz Augusto von Dentz

Bluetooth: btintel_pcie: Align shared DMA memory to 128 bytes

2026-04-13T13:19:42+00:00

Align each descriptor/index/context region to 128 bytes before calculating the total DMA pool size. This ensures the memory layout shared with firmware meets the 128-byte alignment requirement. The DMA pool alignment is also set to 128 bytes to match the firmware expectation for all shared structures. Signed-off-by: Kiran K Signed-off-by: Luiz Augusto von Dentz

Bluetooth: btintel_pcie: Suspend/Resume: Controller doorbell interrupt handling

2025-12-01T21:00:07+00:00

Due to a hardware bug during suspend/resume, the controller may miss a doorbell interrupt. To address this, a retry mechanism has been added to inform the controller before reporting a failure. Test case: - run suspend and resume cycles. Signed-off-by: Ravindra Signed-off-by: Kiran K Signed-off-by: Luiz Augusto von Dentz

Bluetooth: btintel_pcie: Support for S4 (Hibernate)

2025-12-01T21:00:07+00:00

During S4 (hibernate), the Bluetooth device loses power. Upon resume, the driver performs the following actions: 1. Unregisters hdev 2. Calls function level reset 3. Registers hdev Test case: - run command sudo rtcwake -m disk -s 60 Signed-off-by: Ravindra Signed-off-by: Kiran K Signed-off-by: Luiz Augusto von Dentz

Bluetooth: btintel_pcie: Refactor Device Coredump

2025-09-27T15:37:00+00:00

As device coredumps are not HCI traces, maintain the device coredump at the driver level and eliminate the dependency on hdev_devcd*() Signed-off-by: Kiran K Fixes: 07e6bddb54b4 ("Bluetooth: btintel_pcie: Add support for device coredump") Signed-off-by: Luiz Augusto von Dentz

Bluetooth: btintel_pcie: Support Function level reset

2025-07-23T14:23:57+00:00

The driver supports Function Level Reset (FLR) to recover the controller upon hardware exceptions or hci command timeouts. FLR is triggered only when no prior reset has occurred within the retry window, with a maximum of one FLR allowed within this window. This patch is tested by, echo 1 > /sys/class/bluetooth/hciX/reset Signed-off-by: Chandrashekar Devegowda Signed-off-by: Kiran K Signed-off-by: Luiz Augusto von Dentz

Bluetooth: btintel_pcie: Increase the tx and rx descriptor count

2025-06-05T18:53:53+00:00

This change addresses latency issues observed in HID use cases where events arrive in bursts. By increasing the Rx descriptor count to 64, the firmware can handle bursty data more effectively, reducing latency and preventing buffer overflows. Signed-off-by: Chandrashekar Devegowda Signed-off-by: Kiran K Fixes: c2b636b3f788 ("Bluetooth: btintel_pcie: Add support for PCIe transport") Signed-off-by: Luiz Augusto von Dentz

Bluetooth: btintel_pcie: Fix driver not posting maximum rx buffers

2025-06-05T18:53:32+00:00

The driver was posting only 6 rx buffers, despite the maximum rx buffers being defined as 16. Having fewer RX buffers caused firmware exceptions in HID use cases when events arrived in bursts. Exception seen on android 6.12 kernel. E Bluetooth: hci0: Received hw exception interrupt E Bluetooth: hci0: Received gp1 mailbox interrupt D Bluetooth: hci0: 00000000: ff 3e 87 80 03 01 01 01 03 01 0c 0d 02 1c 10 0e D Bluetooth: hci0: 00000010: 01 00 05 14 66 b0 28 b0 c0 b0 28 b0 ac af 28 b0 D Bluetooth: hci0: 00000020: 14 f1 28 b0 00 00 00 00 fa 04 00 00 00 00 40 10 D Bluetooth: hci0: 00000030: 08 00 00 00 7a 7a 7a 7a 47 00 fb a0 10 00 00 00 D Bluetooth: hci0: 00000000: 10 01 0a E Bluetooth: hci0: ---- Dump of debug registers — E Bluetooth: hci0: boot stage: 0xe0fb0047 E Bluetooth: hci0: ipc status: 0x00000004 E Bluetooth: hci0: ipc control: 0x00000000 E Bluetooth: hci0: ipc sleep control: 0x00000000 E Bluetooth: hci0: mbox_1: 0x00badbad E Bluetooth: hci0: mbox_2: 0x0000101c E Bluetooth: hci0: mbox_3: 0x00000008 E Bluetooth: hci0: mbox_4: 0x7a7a7a7a Signed-off-by: Chandrashekar Devegowda Signed-off-by: Kiran K Fixes: c2b636b3f788 ("Bluetooth: btintel_pcie: Add support for PCIe transport") Signed-off-by: Luiz Augusto von Dentz

Bluetooth: btintel_pcie: Dump debug registers on error

2025-05-21T14:28:08+00:00

Dumping debug registers on GP1 MSIx and error conditions, such as TX completion timeout, aiding in understanding the controller's state during errors. The register dump includes: - Boot stage - IPC control - IPC status - Mailbox registers HCI traces: = Vendor Diagnostic (len 199) 2d 2d 2d 2d 20 44 75 6d 70 20 6f 66 20 64 65 62 ---- Dump of deb 75 67 20 72 65 67 69 73 74 65 72 73 20 2d 2d 2d ug registers --- 62 6f 6f 74 20 73 74 61 67 65 3a 20 30 78 61 30 boot stage: 0xa0 66 61 30 30 34 37 69 70 63 20 73 74 61 74 75 73 fa0047ipc status 3a 20 30 78 30 30 30 30 30 30 30 34 69 70 63 20 : 0x00000004ipc 63 6f 6e 74 72 6f 6c 3a 20 30 78 30 30 30 30 30 control: 0x00000 30 30 30 69 70 63 20 73 6c 65 65 70 20 63 6f 6e 000ipc sleep con 74 72 6f 6c 3a 20 30 78 30 30 30 30 30 30 30 30 trol: 0x00000000 6d 62 6f 78 20 73 74 61 74 75 73 3a 20 30 78 30 mbox status: 0x0 30 30 30 30 30 30 30 72 78 71 3a 20 63 72 5f 74 0000000rxq: cr_t 69 61 3a 20 37 20 63 72 5f 68 69 61 3a 20 37 74 ia: 7 cr_hia: 7t 78 71 3a 20 63 72 5f 74 69 61 3a 20 36 20 63 72 xq: cr_tia: 6 cr 5f 68 69 61 3a 20 36 _hia: 6 Signed-off-by: Chandrashekar Devegowda Signed-off-by: Kiran K Signed-off-by: Luiz Augusto von Dentz