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From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Cc: Tony Lindgren <tony@atomide.com>, Paul Walmsley <paul@pwsan.com>,
	linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/5 v2] ARM: OMAP1: recalculate loops per jiffy after dpll1 reprogram
Date: Fri, 9 Dec 2011 08:42:45 +0000	[thread overview]
Message-ID: <20111209084245.GB14547@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1322526332-14088-1-git-send-email-jkrzyszt@tis.icnet.pl>

On Tue, Nov 29, 2011 at 01:25:32AM +0100, Janusz Krzysztofik wrote:
> However, the result of cpufreq_scale() differs from that of
> (re)calibrate_delay() by ca. 6%, i.e., 70.40 vs. 74.54. Please advise if
> this approximation is acceptable.

You don't say which figure is what.

Note that calibrate_delay() is itself inaccurate - the loops_per_jiffy
is the number of loops which can be executed between two timer ticks
_minus_ the time to process the timer interrupt itself.  So, it's
actually always a little less than the theoretical number of loops
within that time period.

  reply	other threads:[~2011-12-09  8:43 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-11-27  3:32 [PATCH 0/5] ARM: OMAP1: Fix dpll1 reprogramming related issues Janusz Krzysztofik
2011-11-27  3:32 ` [PATCH 1/5] ARM: OMAP1: Fix dpll1 default rate reprogramming method Janusz Krzysztofik
2011-11-28 17:45   ` Tony Lindgren
2011-11-28 22:00     ` [PATCH 2a/5] Remove unsafe clock values from omap1_defconfig Janusz Krzysztofik
2011-11-30 22:32       ` Tony Lindgren
2011-11-30 20:57     ` [PATCH 2a/5 v2] ARM: OMAP1: select clock rate by CPU type Janusz Krzysztofik
2011-11-30 22:28       ` Tony Lindgren
2011-12-01 10:10         ` Janusz Krzysztofik
2011-12-01 18:22           ` Tony Lindgren
2011-12-01 18:54             ` Janusz Krzysztofik
2011-12-01 19:06               ` Tony Lindgren
2011-12-09  1:51       ` [PATCH] ARM: OMAP1: Set the omap1623 sram size to 16K Tony Lindgren
     [not found]     ` <201112010310.43890.jkrzyszt@tis.icnet.pl>
     [not found]       ` <20111201022750.GY13928@atomide.com>
2011-12-01  9:54         ` [PATCH 2a/5] Remove unsafe clock values from omap1_defconfig Janusz Krzysztofik
2011-12-01 10:21           ` Janusz Krzysztofik
2011-12-01 17:17           ` Tony Lindgren
2011-12-01 18:38             ` Janusz Krzysztofik
2011-12-01 19:04               ` Tony Lindgren
2011-12-01 19:23                 ` Janusz Krzysztofik
2011-12-01 19:46                   ` Tony Lindgren
2011-12-01 20:30                     ` [PATCH] ARM: OMAP1: " Janusz Krzysztofik
2011-12-01 20:13                   ` [PATCH 0/2 v2] ARM: OMAP1: Fix dpll1 reprogramming related issues Janusz Krzysztofik
2011-12-01 21:16                     ` [PATCH v2] ARM: OMAP1: Update dpll1 default rate reprogramming method Janusz Krzysztofik
2011-12-02  2:09                     ` [PATCH 0/2 v2] ARM: OMAP1: Fix dpll1 reprogramming related issues Tony Lindgren
2011-12-02 17:02                       ` Janusz Krzysztofik
2011-12-01 20:13                   ` [PATCH 1/2 v2] ARM: OMAP1: Fix ckctl value used for dpll1 defualt rate Janusz Krzysztofik
2011-12-01 20:13                   ` [PATCH 2/2 v2] ARM: OMAP1: recalculate loops per jiffy after dpll1 reprogram Janusz Krzysztofik
2011-11-27  3:32 ` [PATCH 2/5] ARM: OMAP1: Fix ckctl value used for dpll1 defualt rate Janusz Krzysztofik
2011-11-27  3:32 ` [PATCH 3/5] ARM: OMAP1: Fix dpll1 reprogramming not actually allowed Janusz Krzysztofik
2011-11-28 17:46   ` Tony Lindgren
2011-11-27  3:32 ` [PATCH 4/5] init/calibrate.c: allow for recalibration of loops per jiffy Janusz Krzysztofik
2011-11-28 15:39   ` Russell King - ARM Linux
2011-11-28 22:30     ` Janusz Krzysztofik
2011-11-27  3:32 ` [PATCH 5/5] ARM: OMAP1: recalibrate loops per jiffy after dpll1 reprogram Janusz Krzysztofik
2011-11-29  0:25   ` [PATCH 5/5 v2] ARM: OMAP1: recalculate " Janusz Krzysztofik
2011-12-09  8:42     ` Russell King - ARM Linux [this message]
2011-12-09 10:00       ` Janusz Krzysztofik
2011-12-09 10:09         ` Janusz Krzysztofik
2011-12-10  0:25         ` Russell King - ARM Linux
2011-12-10 12:04           ` Janusz Krzysztofik

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