From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: Paul Walmsley <paul@pwsan.com>, Stephen Boyd <sboyd@codeaurora.org>
Cc: Tero Kristo <t-kristo@ti.com>, Tony Lindgren <tony@atomide.com>,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
Nishanth Menon <nm@ti.com>,
Mike Turquette <mturquette@linaro.org>,
linux-clk@vger.kernel.org
Subject: Re: [PATCHv3 10/10] CLK: TI: always enable DESHDCP clock
Date: Fri, 22 May 2015 09:27:07 +0300 [thread overview]
Message-ID: <555ECC3B.6000701@ti.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1505210254330.7960@utopia.booyaka.com>
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On 21/05/15 06:06, Paul Walmsley wrote:
>> Enable falls under the "critical clocks" discussion that is ongoing. I
>> assume that this is some sort of critical clock that can't be turned off?
>
> It only needs to be enabled for this particular display IP subsystem to
> function:
>
> http://marc.info/?l=linux-omap&m=142071550111482&w=2
>
> I believe Tomi is taking this approach (enabling it unconditionally) to
> avoid adding support for a secondary IP block "main clock" to the hwmod
Right. I don't think that would be a simple task (correct me if I'm
wrong), and that would all be only for this one IP on this particular
SoC type.
> code. Apparently, the chips that contain this clock gating bit are not
> intended to be used for power-critical use cases, so there's not much
> motivation to switch it on and off with the display controller.
Even in power-critical use cases the the power use difference should be
negligible.
Tomi
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next prev parent reply other threads:[~2015-05-22 6:27 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-06 10:08 [PATCHv3 00/10] ARM: DRA7: add display support Tomi Valkeinen
2015-05-06 10:08 ` [PATCHv3 02/10] ARM: DRA7: hwmod: add DMM hwmod description Tomi Valkeinen
2015-05-06 10:08 ` [PATCHv3 03/10] ARM: DRA7: hwmod: set DSS submodule parent hwmods Tomi Valkeinen
2015-05-06 10:08 ` [PATCHv3 04/10] ARM: OMAP: display: change compat names to array Tomi Valkeinen
2015-05-06 10:08 ` [PATCHv3 05/10] ARM: OMAP2+: display: detect DRA7 DSS Tomi Valkeinen
2015-05-06 10:08 ` [PATCHv3 06/10] arm/dts: dra7.dtsi: add DSS support Tomi Valkeinen
[not found] ` <1430906938-26128-1-git-send-email-tomi.valkeinen-l0cyMroinI0@public.gmane.org>
2015-05-06 10:08 ` [PATCHv3 01/10] arm/dts: dra7xx: add 'ti,set-rate-parent' for dss_dss_clk Tomi Valkeinen
2015-05-06 10:08 ` [PATCHv3 07/10] arm/dts: dra72-evm.dts: add HDMI Tomi Valkeinen
2015-05-06 10:08 ` [PATCHv3 08/10] arm/dts: am57xx-beagle-x15.dts: " Tomi Valkeinen
2015-05-06 10:08 ` [PATCHv3 09/10] arm: dra7: add DESHDCP clock Tomi Valkeinen
2015-05-06 10:08 ` [PATCHv3 10/10] CLK: TI: always enable " Tomi Valkeinen
2015-05-20 11:47 ` Tero Kristo
2015-05-20 11:50 ` Tero Kristo
2015-05-20 19:34 ` Stephen Boyd
2015-05-21 3:06 ` Paul Walmsley
2015-05-22 6:27 ` Tomi Valkeinen [this message]
2015-05-28 4:22 ` Michael Turquette
2015-05-28 6:25 ` Tero Kristo
2015-05-28 22:49 ` Stephen Boyd
2015-05-27 9:11 ` Tomi Valkeinen
2015-06-03 16:19 ` Michael Turquette
2015-05-20 8:24 ` [PATCHv3 00/10] ARM: DRA7: add display support Tomi Valkeinen
2015-06-01 5:46 ` Paul Walmsley
2015-06-01 6:21 ` Tomi Valkeinen
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