From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Tero Kristo <t-kristo@ti.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
Tony Lindgren <tony@atomide.com>,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@codeaurora.org>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
linux-clk <linux-clk@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC 6/9] clk: ti: add support for omap4 module clocks
Date: Mon, 4 Jan 2016 14:42:22 +0000 [thread overview]
Message-ID: <20160104144221.GA5783@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <568A735D.2060309@ti.com>
On Mon, Jan 04, 2016 at 03:27:57PM +0200, Tero Kristo wrote:
> On 01/04/2016 12:21 PM, Geert Uytterhoeven wrote:
> >FWIW, there are small loops with just a cpu_relax() in various clock drivers
> >under drivers/clk/shmobile/.
>
> Just did a quick profiling round, and the clk_enable/disable delay loops
> take anything from 0...1500ns, most typically consuming some 400-600ns. So,
> based on this, dropping the udelay and adding cpu_relax instead looks like a
> good change. I just verified that changing the udelay to cpu_relax works
> fine also, I just need to change the bail-out period to be something sane.
Was that profiling done with lockdep/lock debugging enabled or disabled?
--
RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/
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WARNING: multiple messages have this Message-ID (diff)
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC 6/9] clk: ti: add support for omap4 module clocks
Date: Mon, 4 Jan 2016 14:42:22 +0000 [thread overview]
Message-ID: <20160104144221.GA5783@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <568A735D.2060309@ti.com>
On Mon, Jan 04, 2016 at 03:27:57PM +0200, Tero Kristo wrote:
> On 01/04/2016 12:21 PM, Geert Uytterhoeven wrote:
> >FWIW, there are small loops with just a cpu_relax() in various clock drivers
> >under drivers/clk/shmobile/.
>
> Just did a quick profiling round, and the clk_enable/disable delay loops
> take anything from 0...1500ns, most typically consuming some 400-600ns. So,
> based on this, dropping the udelay and adding cpu_relax instead looks like a
> good change. I just verified that changing the udelay to cpu_relax works
> fine also, I just need to change the bail-out period to be something sane.
Was that profiling done with lockdep/lock debugging enabled or disabled?
--
RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
next prev parent reply other threads:[~2016-01-04 14:42 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-18 13:58 [RFC 0/9] ARM: OMAP4: hwmod clkctrl conversion to DT + clock driver Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` [RFC 1/9] ARM: OMAP2+: omap_device: create clock alias purely from DT data Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 15:16 ` Tony Lindgren
2015-12-18 15:16 ` Tony Lindgren
2015-12-18 13:58 ` [RFC 2/9] ARM: OMAP2+: hwmod: initialize main clocks directly from DT Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` [RFC 3/9] clk: ti: remove un-used definitions from public clk_hw_omap struct Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` [RFC 4/9] clk: ti: mux: export mux clock APIs locally Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` [RFC 5/9] dt-bindings: clk: ti: Document module clock type Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` [RFC 6/9] clk: ti: add support for omap4 module clocks Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 15:36 ` Tony Lindgren
2015-12-18 15:36 ` Tony Lindgren
2016-01-01 5:48 ` Michael Turquette
2016-01-01 5:48 ` Michael Turquette
2016-01-01 5:48 ` Michael Turquette
2016-01-04 7:36 ` Tero Kristo
2016-01-04 7:36 ` Tero Kristo
2016-01-04 7:36 ` Tero Kristo
2016-01-04 10:21 ` Geert Uytterhoeven
2016-01-04 10:21 ` Geert Uytterhoeven
2016-01-04 10:21 ` Geert Uytterhoeven
2016-01-04 13:27 ` Tero Kristo
2016-01-04 13:27 ` Tero Kristo
2016-01-04 14:42 ` Russell King - ARM Linux [this message]
2016-01-04 14:42 ` Russell King - ARM Linux
2016-01-04 16:37 ` Tony Lindgren
2016-01-04 16:37 ` Tony Lindgren
2016-01-04 19:15 ` Tero Kristo
2016-01-04 19:15 ` Tero Kristo
2016-01-05 1:23 ` Michael Turquette
2016-01-05 1:23 ` Michael Turquette
2016-01-05 1:23 ` Michael Turquette
2016-01-05 1:29 ` Michael Turquette
2016-01-05 1:29 ` Michael Turquette
2016-01-05 1:29 ` Michael Turquette
2015-12-18 13:58 ` [RFC 7/9] ARM: dts: omap4: add hwmod " Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 13:58 ` Tero Kristo
2015-12-18 15:06 ` Tony Lindgren
2015-12-18 15:06 ` Tony Lindgren
2015-12-18 13:59 ` [RFC 8/9] ARM: OMAP4: hwmod_data: use module clocks from DT Tero Kristo
2015-12-18 13:59 ` Tero Kristo
2015-12-18 13:59 ` Tero Kristo
2015-12-18 15:11 ` Tony Lindgren
2015-12-18 15:11 ` Tony Lindgren
2015-12-18 13:59 ` [RFC 9/9] clk: ti: omap4: update clock aliases to reflect new module clocks Tero Kristo
2015-12-18 13:59 ` Tero Kristo
2015-12-18 13:59 ` Tero Kristo
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