From: Thomas Gleixner <tglx@linutronix.de>
To: Richard Cochran <richardcochran@gmail.com>
Cc: "Christopher S. Hall" <christopher.s.hall@intel.com>,
jeffrey.t.kirsher@intel.com, hpa@zytor.com, mingo@redhat.com,
john.stultz@linaro.org, peterz@infradead.org, x86@kernel.org,
intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, kevin.b.stanton@intel.com
Subject: Re: [PATCH v4 1/4] Produce system time from correlated clocksource
Date: Wed, 14 Oct 2015 09:21:42 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.11.1510140920200.25029@nanos> (raw)
In-Reply-To: <20151013211224.GA19242@netboy>
On Tue, 13 Oct 2015, Richard Cochran wrote:
> On Tue, Oct 13, 2015 at 09:15:51PM +0200, Thomas Gleixner wrote:
> > That's not working. The firmware is not going to change, no matter
> > what.
>
> Can we at least have a explanation of how the firmware operates? How
> are (ART,sys) pairs are generated, and how they are supposed to get
> into the DSP?
The firmware gives you an ART/audio timestamp pair. The firmware does
neither know about system time nor about PTP time.
So we have to do correlation in software.
Thanks,
tglx
next prev parent reply other threads:[~2015-10-14 7:21 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-12 18:45 [PATCH v4 0/4] Patchset enabling hardware based cross-timestamps for next gen Intel platforms Christopher S. Hall
2015-10-12 18:45 ` [PATCH v4 1/4] Produce system time from correlated clocksource Christopher S. Hall
2015-10-13 4:58 ` Richard Cochran
2015-10-13 7:51 ` Thomas Gleixner
2015-10-13 8:31 ` Richard Cochran
2015-10-13 19:15 ` Thomas Gleixner
2015-10-13 21:12 ` Richard Cochran
2015-10-14 7:21 ` Thomas Gleixner [this message]
2015-10-14 9:29 ` Richard Cochran
2015-10-14 14:22 ` Thomas Gleixner
2015-10-14 16:18 ` Richard Cochran
2015-10-15 2:34 ` Christopher Hall
2015-10-15 5:41 ` Richard Cochran
2015-10-15 8:13 ` Thomas Gleixner
2015-10-13 5:26 ` Richard Cochran
2015-10-13 13:50 ` Richard Cochran
2015-10-13 19:42 ` Thomas Gleixner
2015-10-15 1:57 ` Christopher Hall
2015-10-15 5:57 ` Richard Cochran
2015-10-15 8:15 ` Thomas Gleixner
2015-10-20 0:18 ` Christopher Hall
2015-10-20 0:36 ` John Stultz
2015-10-20 8:54 ` Richard Cochran
2015-10-20 10:48 ` Thomas Gleixner
2015-10-20 11:51 ` Richard Cochran
2015-10-20 14:55 ` Richard Cochran
2015-10-20 19:11 ` Thomas Gleixner
2015-10-20 19:36 ` Richard Cochran
2015-10-20 20:16 ` John Stultz
2015-10-21 7:44 ` Thomas Gleixner
2015-11-03 19:18 ` Stanton, Kevin B
2015-11-09 21:17 ` John Stultz
2015-10-12 18:45 ` [PATCH v4 2/4] Always running timer " Christopher S. Hall
2015-10-13 2:03 ` kbuild test robot
2015-11-18 23:53 ` Jacob Pan
2015-10-12 18:45 ` [PATCH v4 3/4] Add PTP_SYS_OFFSET_PRECISE for driver crosstimestamping Christopher S. Hall
2015-10-13 13:59 ` Richard Cochran
2015-10-15 2:47 ` Christopher Hall
2015-11-07 2:15 ` Christopher Hall
2015-10-12 18:45 ` [PATCH v4 4/4] Adds hardware supported cross timestamp Christopher S. Hall
2015-10-13 2:10 ` kbuild test robot
2015-10-13 2:11 ` kbuild test robot
2015-10-13 2:31 ` David Miller
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