Date: Fri, 18 Sep 2020 05:04:35 +0000 From: bugzilla-noreply@freebsd.org To: usb@FreeBSD.org Subject: [Bug 237666] repeated messages of "uhub_reattach_port: giving up port reset - device vanished" Message-ID: <bug-237666-19105-i5Kqgu9KAA@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-237666-19105@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237666 --- Comment #134 from Mark Millard <marklmi26-fbsd@yahoo.com> --- (In reply to Mark Millard from comment #133) The code in xhci_do_command does a doorbell/mailbox style: XWRITE4(sc, door, XHCI_DOORBELL(0), 0); which seems to get to: ffff0000007c4b60 <generic_bs_w_4> str w3, [x1, x2] ffff0000007c4b64 <generic_bs_w_4+0x4> ret But I have not been able to track down there being the apparently-architecturally-required DSB ST (or DSB) after prior memory updates but before the write to the doorbell/mailbox location (execution order for after then before). I'm using Barrier_Litmus_Tests_and_Cookbook_A08.pdf for reference, section 8.1. But I'm not an aarch64 expert so my interpretation of the material could be at issue. -- You are receiving this mail because: You are the assignee for the bug.home | help
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