[{"id":3674622,"web_url":"http://patchwork.ozlabs.org/comment/3674622/","msgid":"","list_archive_url":null,"date":"2026-04-08T07:37:03","subject":"ACK: [SRU][R][PATCH 0/1] Bluetooth device (MT7925) not detected on\n USB bus with linux-oem-6.17","submitter":{"id":92836,"url":"http://patchwork.ozlabs.org/api/people/92836/","name":"Yufeng Gao","email":"yufeng.gao@canonical.com"},"content":"On 8/4/26 10:28, AceLan Kao wrote:\n> From: \"Chia-Lin Kao (AceLan)\" \n>\n> BugLink: https://bugs.launchpad.net/bugs/2145164\n>\n> [Impact]\n> MT7925 Bluetooth on Dell systems fails to enumerate at boot when the\n> BT_RST GPIO is stuck low. The device never comes up and Bluetooth is\n> unavailable. The only recovery is a full mechanical power-off (G3 cycle).\n>\n> Error log:\n> [ 6.813942] usb 3-10: device descriptor read/64, error -110\n> [ 22.685978] usb 3-10: device descriptor read/64, error -110\n> [ 28.317963] usb 3-10: device descriptor read/64, error -110\n> [ 44.189949] usb 3-10: device descriptor read/64, error -110\n> [ 44.189960] usb usb3-port10: unable to enumerate USB device\n>\n> Warm reboots and S5 sleep do not clear the stuck GPIO state. Hits 100%\n> on affected hardware once the GPIO is stuck.\n>\n> [Fix]\n> Add usb_acpi_port_prr_reset() to drivers/usb/core/usb-acpi.c. When a\n> USB port has an ACPI _PRR method, the function calls _RST on the\n> returned power resource to toggle the hardware reset line.\n>\n> Wire it into hub_port_connect() during the mid-retry VBUS power-cycle:\n> call _PRR._RST while VBUS is off so the GPIO pulse completes before the\n> device gets power. After VBUS comes back on, sleep 100 ms (per USB 2.0\n> spec ยง7.1.7.3 Fig. 7-29) when _RST succeeded, because\n> hub_power_on_good_delay() has no minimum floor and can return as little\n> as 20 ms on xHCI root hubs.\n>\n> https://lore.kernel.org/lkml/20260326011708.1128840-1-acelan.kao@canonical.com/T/#u\n>\n> [Test Plan]\n> Trigger the stuck-GPIO condition (G3 cycle on affected Dell hardware to\n> put the system in a normal state, then warm reboot to reproduce).\n>\n> Without patch:\n> - dmesg shows repeated \"device descriptor read/64, error -110\"\n> - Bluetooth unavailable; recovery requires G3 cycle\n>\n> With patch:\n> - dmesg shows \"attempt power cycle\" followed by successful enumeration\n> - Bluetooth comes up without any manual intervention\n>\n> Expected dmesg with patch:\n> [ 44.294065] usb usb3-port10: attempt power cycle\n> [ 44.872709] usb 3-10: new high-speed USB device number 6 using xhci_hcd\n> [ 44.888293] usb 3-10: New USB device found, idVendor=0489, idProduct=e139, bcdDevice= 1.00\n> [ 44.888318] usb 3-10: Manufacturer: MediaTek Inc.\n>\n> [Where problems could occur]\n> Could affect USB hub port handling in drivers/usb/core/hub.c and\n> usb-acpi.c.\n>\n> usb_acpi_port_prr_reset() is a no-op on ports with no ACPI _PRR method,\n> so non-affected hardware should be unaffected. If the ACPI method\n> evaluation returns an unexpected object type or the _RST call hangs, the\n> hub_port_connect() retry loop could stall or log spurious errors.\n>\n> The 100 ms sleep is conditional on _RST succeeding (prr_reset == 0), so\n> it does not add latency to ports without _PRR.\n>\n> Chia-Lin Kao (AceLan) (1):\n> UBUNTU: SAUCE: USB: hub: call ACPI _PRR reset during port power-cycle\n> on enumeration failure\n>\n> drivers/usb/core/hub.c | 14 ++++++++\n> drivers/usb/core/usb-acpi.c | 68 +++++++++++++++++++++++++++++++++++++\n> drivers/usb/core/usb.h | 3 ++\n> 3 files changed, 85 insertions(+)\n>\nAcked-by: Yufeng Gao ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=O1jgy0UX;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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charset=\"utf-8\"; Format=\"flowed\"","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "}},{"id":3674670,"web_url":"http://patchwork.ozlabs.org/comment/3674670/","msgid":"","list_archive_url":null,"date":"2026-04-08T09:15:14","subject":"APPLIED[R]: Re: [SRU][R][PATCH 0/1] Bluetooth device (MT7925) not\n detected on USB bus with linux-oem-6.17","submitter":{"id":7245,"url":"http://patchwork.ozlabs.org/api/people/7245/","name":"Paolo Pisati","email":"paolo.pisati@canonical.com"},"content":"On Wed, Apr 08, 2026 at 08:28:08AM +0800, AceLan Kao wrote:\n> From: \"Chia-Lin Kao (AceLan)\" \n> \n> BugLink: https://bugs.launchpad.net/bugs/2145164\n\nApplied.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (4096-bit key;\n unprotected) header.d=canonical.com header.i=@canonical.com\n header.a=rsa-sha256 header.s=20251003 header.b=UPsc1b5J;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; 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