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From: Adrian Chadd <adrian@freebsd.org>
To: ath9k-devel@lists.ath9k.org
Subject: [ath9k-devel] Interrupt issue on ARM with SMP
Date: Sat, 27 Aug 2016 21:44:39 -0700	[thread overview]
Message-ID: <CAJ-VmonaO6M7KJt1gyMbPgj5eiZ250fkeEOX0S8MA40=o1xiQQ@mail.gmail.com> (raw)
In-Reply-To: <F9D95AC275991E48901933FBF3337AB0A3315AA4@ex-02>

Hi,

So, interrupt handling is finnicky. It's possible there's already a
posted interrupt waiting somewhere. Ideally you'd do a write-then-read
in each of the interrupt blocks between your device and the CPU to
ensure thing are synced. Otherwise the different frequencies in
different blocks in the ARM code mean you get interrupts after you've
cleared the interrupt itself, because it hasn't yet posted in that
particular hardware block.

Yay, etc.



-adrian

  reply	other threads:[~2016-08-28  4:44 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-25  3:50 [ath9k-devel] Interrupt issue on ARM with SMP Lamar Hansford
2016-08-25 15:48 ` Adrian Chadd
2016-08-25 18:15   ` Lamar Hansford
2016-08-26  1:33     ` Adrian Chadd
2016-08-26 14:35       ` Lamar Hansford
2016-08-28  4:44         ` Adrian Chadd [this message]
2016-08-29 15:27           ` Lamar Hansford

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