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From: Mark Zhang <nvmarkzhang-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
Cc: "Thierry Reding"
	<thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>,
	"Mike Turquette"
	<mturquette-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	"Peter De Schrijver"
	<pdeschrijver-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
	"Prashant Gaikwad"
	<pgaikwad-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
	"Terje Bergström"
	<tbergstrom-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH 2/2] clk: tegra: Make gr2d and gr3d clocks children of pll_c
Date: Mon, 01 Apr 2013 14:03:40 +0800	[thread overview]
Message-ID: <5159233C.9060809@gmail.com> (raw)
In-Reply-To: <51560BC4.8020400-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>

On 03/30/2013 05:46 AM, Stephen Warren wrote:
> On 03/28/2013 02:31 PM, Thierry Reding wrote:
>> By default these clocks are children of pll_m, but in downstream kernels
>> they are reparented to pll_c. While at it, decrease their frequencies to
>> 300 MHz because the defaults aren't in the specified range.
>>
>> gr2d can reportedly run at much higher frequencies, but 300 MHz works
>> and is a more conservative default.
> 
> Questions on this patch:
> 
> Do we need to do the same thing for Tegra30 and/or Tegra114?
> 

I think yes. For Tegra114, it's pll_c2.

> Is 300MHz the right value?
> 

Right. I use 300MHz on Tegra114 and it seems OK. I recall sometimes
276MHz can be used as well.

Mark
> I'm hoping that Peter, Prashant, and/or Terje can provide guidance here.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-tegra" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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> 

  parent reply	other threads:[~2013-04-01  6:03 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-28 20:31 [PATCH 1/2] clk: tegra: Export peripheral reset functions Thierry Reding
     [not found] ` <1364502688-5135-1-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2013-03-28 20:31   ` [PATCH 2/2] clk: tegra: Make gr2d and gr3d clocks children of pll_c Thierry Reding
     [not found]     ` <1364502688-5135-2-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2013-03-29 21:46       ` Stephen Warren
     [not found]         ` <51560BC4.8020400-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-04-01  6:03           ` Mark Zhang [this message]
2013-04-02  5:28           ` Terje Bergström
     [not found]             ` <515A6C95.4060900-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-04-02  5:47               ` Thierry Reding
     [not found]                 ` <20130402054722.GA21277-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org>
2013-04-02  5:50                   ` Terje Bergström
2013-04-02  9:33       ` Peter De Schrijver
2013-03-28 23:23   ` [PATCH 1/2] clk: tegra: Export peripheral reset functions Stephen Warren
2013-03-29 15:34   ` Stephen Warren
2013-03-29 21:45   ` Stephen Warren
2013-04-02  9:34   ` Peter De Schrijver
     [not found]     ` <20130402093426.GZ18519-Rysk9IDjsxmJz7etNGeUX8VPkgjIgRvpAL8bYrjMMd8@public.gmane.org>
2013-04-02 17:35       ` Mike Turquette

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