linux-kernel - Re: [REGRESSION][BISECTED] "xHCI host controller not responding, assume dead" on stable kernel

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Date: Tue, 21 May 2024 14:26:54 +0300
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Gia <giacomo.gio@...il.com>
Cc: Benjamin Böhmke <benjamin@...hmke.net>,
	Mario Limonciello <mario.limonciello@....com>,
	Christian Heusel <christian@...sel.eu>,
	Linux regressions mailing list <regressions@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"kernel@...ha.zone" <kernel@...ha.zone>,
	Andreas Noever <andreas.noever@...il.com>,
	Michael Jamet <michael.jamet@...el.com>,
	Yehezkel Bernat <YehezkelShB@...il.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"S, Sanath" <Sanath.S@....com>
Subject: Re: [REGRESSION][BISECTED] "xHCI host controller not responding,
 assume dead" on stable kernel > 6.8.7

On Tue, May 21, 2024 at 11:12:10AM +0200, Gia wrote:
> Here you have the output from the dock upstream port:
> 
> sudo tbdump -r 2 -a 1 -vv -N2 LANE_ADP_CS_0
> 
> 0x0036 0x003c013e 0b00000000 00111100 00000001 00111110 .... LANE_ADP_CS_0
>   [00:07]       0x3e Next Capability Pointer
>   [08:15]        0x1 Capability ID
>   [16:19]        0xc Supported Link Speeds
>   [20:21]        0x3 Supported Link Widths (SLW)
>   [22:23]        0x0 Gen 4 Asymmetric Support (G4AS)
>   [26:26]        0x0 CL0s Support
>   [27:27]        0x0 CL1 Support
>   [28:28]        0x0 CL2 Support
> 0x0037 0x0828003c 0b00001000 00101000 00000000 00111100 .... LANE_ADP_CS_1
>   [00:03]        0xc Target Link Speed → Router shall attempt Gen 3 speed
>   [04:05]        0x3 Target Link Width → Establish a Symmetric Link
>   [06:07]        0x0 Target Asymmetric Link → Establish Symmetric Link
>   [10:10]        0x0 CL0s Enable
>   [11:11]        0x0 CL1 Enable
>   [12:12]        0x0 CL2 Enable
>   [14:14]        0x0 Lane Disable (LD)
>   [15:15]        0x0 Lane Bonding (LB)
>   [16:19]        0x8 Current Link Speed → Gen 2
>   [20:25]        0x2 Negotiated Link Width → Symmetric Link (x2)
>   [26:29]        0x2 Adapter State → CL0
>   [30:30]        0x0 PM Secondary (PMS)

Hmm, okay both sides announce support of Gen3 yet the link is Gen2 which
makes me still suspect the cable, or the connection in general. I
suggest, if you have, try with another Thunderbolt cable.