From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: Richard Cochran <richardcochran@gmail.com>
Cc: alsa-devel@alsa-project.org, Takashi Iwai <tiwai@suse.de>,
linux-kernel@vger.kernel.org, Vinod Koul <vinod.koul@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Sagar Arun Kamble <sagar.a.kamble@intel.com>
Subject: Re: [alsa-devel] [PATCH 15/27] ALSA: hda - Use timecounter_initialize interface
Date: Tue, 2 Jan 2018 13:53:01 -0600 [thread overview]
Message-ID: <9f09abee-68b8-4515-131f-0f3e210503b0@linux.intel.com> (raw)
In-Reply-To: <20180102182146.vbfnihz73lhgf6lc@localhost>
On 1/2/18 12:21 PM, Richard Cochran wrote:
> On Tue, Jan 02, 2018 at 11:15:45AM -0600, Pierre-Louis Bossart wrote:
>> I wrote the code for HDaudio and I remember wasting time trying to figure
>> out the gory details of the cycle counter stuff when all I wanted was a
>> conversion from a 24MHz counter to ns values using a 125/3 operation in the
>> right order - as explained in the comments
>
> Would using clocks_calc_mult_shift() work for you?
In theory yes, but I'd need to re-check what the results would be.
I remember applying the 1/3 factor separately to avoid wrap-around after
4 hours [1], but I can't remember the details on the analysis. I can't
figure out what the 'maxsec' argument should be either.
[1]
http://elixir.free-electrons.com/linux/latest/source/sound/hda/hdac_stream.c#L486
next prev parent reply other threads:[~2018-01-02 19:53 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-15 7:38 [PATCH 00/27] timecounter/cyclecounter struct/interface update Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 01/27] timecounter: Make cyclecounter struct part of timecounter struct Sagar Arun Kamble
2018-01-08 22:20 ` [Intel-wired-lan] " Brown, Aaron F
2018-01-09 9:01 ` Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 02/27] timecounter: Introduce timecounter_initialize to update timecounter and cyclecounter Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 03/27] microblaze: Use timecounter_initialize interface Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 04/27] clocksource/arm_arch_timer: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 05/27] amd-xgbe: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 06/27] bnx2x: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 07/27] fec: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 08/27] e1000e: " Sagar Arun Kamble
2018-01-06 4:31 ` [Intel-wired-lan] " Brown, Aaron F
2017-12-15 7:38 ` [PATCH 09/27] igb: " Sagar Arun Kamble
2018-01-06 5:14 ` [Intel-wired-lan] " Brown, Aaron F
2017-12-15 7:38 ` [PATCH 10/27] ixgbe: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 11/27] net/mlx4: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 12/27] net/mlx5: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 13/27] qede: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 14/27] net: cpts: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 15/27] ALSA: hda - " Sagar Arun Kamble
2017-12-15 11:10 ` [alsa-devel] " Takashi Iwai
2017-12-15 16:51 ` Richard Cochran
2017-12-15 17:10 ` Takashi Iwai
2017-12-26 7:37 ` Sagar Arun Kamble
2017-12-28 16:49 ` Richard Cochran
2018-01-02 6:03 ` Sagar Arun Kamble
2018-01-02 17:15 ` Pierre-Louis Bossart
2018-01-02 18:21 ` Richard Cochran
2018-01-02 19:53 ` Pierre-Louis Bossart [this message]
2018-01-05 10:06 ` Sagar Arun Kamble
2018-01-05 15:43 ` Pierre-Louis Bossart
2018-01-09 10:09 ` Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 16/27] timecounter: Introduce timecounter_reset Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 17/27] amd-xgbe: Use timecounter_reset interface Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 18/27] bnx2x: " Sagar Arun Kamble
2017-12-18 14:13 ` Kalluru, Sudarsana
2017-12-15 7:38 ` [PATCH 19/27] net: fec: ptp: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 20/27] e1000e: " Sagar Arun Kamble
2018-01-06 4:30 ` [Intel-wired-lan] " Brown, Aaron F
2017-12-15 7:38 ` [PATCH 21/27] igb: " Sagar Arun Kamble
2018-01-06 4:33 ` [Intel-wired-lan] " Brown, Aaron F
2017-12-15 7:38 ` [PATCH 22/27] ixgbe: " Sagar Arun Kamble
2018-01-06 4:33 ` [Intel-wired-lan] " Brown, Aaron F
2018-01-06 5:11 ` Brown, Aaron F
2017-12-15 7:38 ` [PATCH 23/27] net/mlx4: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 24/27] net/mlx5: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 25/27] qede: " Sagar Arun Kamble
2017-12-18 14:13 ` Kalluru, Sudarsana
2017-12-15 7:38 ` [PATCH 26/27] net: cpts: " Sagar Arun Kamble
2017-12-15 7:38 ` [PATCH 27/27] timecounter: Remove timecounter_init Sagar Arun Kamble
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