UPSTREAM: Bluetooth: hci_qca: Use 100 ms SSR delay for rampatch and NVM loading#1246
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…VM loading When bt_en is pulled high by hardware, the host does not re-download the firmware after SSR. The controller loads the rampatch and NVM internally. On WCN7850 chip, the rampatch is ~264 KB and the NVM is ~9.4 KB. The loading process takes approximately 70 ms. The previous 50 ms delay is too short, causing the controller to not respond to the reset command sent by the host, which leads to BT initialization failure: Bluetooth: hci0: QCA memdump Done, received 458752, total 458752 Bluetooth: hci0: mem_dump_status: 2 Bluetooth: hci0: Opcode 0x0c03 failed: -110 Increase the delay to 100 ms, which was confirmed as a safe value by the controller, to ensure the controller has finished loading the firmware before the host sends commands. Steps to reproduce: 1. Trigger SSR and wait for SSR to complete: hcitool cmd 0x3f 0c 26 2. Run "bluetoothctl power on" and observe that BT fails to start. Fixes: fce1a92 ("Bluetooth: hci_qca: Fix SSR (SubSystem Restart) fail when BT_EN is pulled up by hw") Cc: stable@vger.kernel.org Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> Signed-off-by: Shuai Zhang <shuai.zhang@oss.qualcomm.com> Link: https://lore.kernel.org/r/20260525065156.2213123-1-shuai.zhang@oss.qualcomm.com
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When bt_en is pulled high by hardware, the host does not re-download the firmware after SSR. The controller loads the rampatch and NVM internally.
On WCN7850 chip, the rampatch is ~264 KB and the NVM is ~9.4 KB. The loading process takes approximately 70 ms. The previous 50 ms delay is too short, causing the controller to not respond to the reset command sent by the host, which leads to BT initialization failure:
Bluetooth: hci0: QCA memdump Done, received 458752, total 458752
Bluetooth: hci0: mem_dump_status: 2
Bluetooth: hci0: Opcode 0x0c03 failed: -110
Increase the delay to 100 ms, which was confirmed as a safe value by the controller, to ensure the controller has finished loading the firmware before the host sends commands.
Steps to reproduce:
Fixes: fce1a92 ("Bluetooth: hci_qca: Fix SSR (SubSystem Restart) fail when BT_EN is pulled up by hw")
Cc: stable@vger.kernel.org
Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@oss.qualcomm.com
Link: https://lore.kernel.org/all/20260525065156.2213123-1-shuai.zhang@oss.qualcomm.com/
CRs-Fixed: 4495934