From mboxrd@z Thu Jan  1 00:00:00 1970
From: jcrouse@codeaurora.org (Jordan Crouse)
Date: Wed, 10 Oct 2018 09:10:06 -0600
Subject: [Freedreno] [PATCH 5/9] arm64: dts: sdm845: Add gpu and gmu
 device nodes
In-Reply-To: <20181010145139.nvalsr2ij2lj53dh@vireshk-i7>
References: <20180827151112.25211-1-jcrouse@codeaurora.org>
 <20180827151112.25211-6-jcrouse@codeaurora.org>
 <20181010094628.wejfgmvcv6stzoco@vireshk-i7>
 <20181010142905.GB9977@jcrouse-lnx.qualcomm.com>
 <20181010143149.4e3ct3efkuwxa2hw@vireshk-i7>
 <20181010144856.GC9977@jcrouse-lnx.qualcomm.com>
 <20181010145139.nvalsr2ij2lj53dh@vireshk-i7>
Message-ID: <20181010151006.GD9977@jcrouse-lnx.qualcomm.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Wed, Oct 10, 2018 at 08:21:39PM +0530, Viresh Kumar wrote:
> On 10-10-18, 08:48, Jordan Crouse wrote:
> > qcom,level comes straight from:
> > 
> > https://lore.kernel.org/lkml/20180627045234.27403-2-rnayak at codeaurora.org/
> > 
> > But in this case instead of using the CPU to program the RPMh we are passing
> > the value to a microprocessor (the GMU) and that will do the vote on our behalf
> > (Technically we use the value to look up the vote in the cmd-db database and
> > pass that to the GMU)
> > 
> > This is why the qcom,level was added in the first place so we could at least
> > share the nomenclature with the rpmhd if not the implementation.
> 
> How you actually pass the vote to the underlying hardware, RPMh or
> GMU, is irrelevant to the whole thing. What is important is how we
> describe that in DT and how we represent the whole thing.
> 
> We have chosen genpd + OPP to do this and same should be used by you
> as well. Another benefit is that the genpd core will do vote
> aggregation for you here.

I'm not sure what you are suggesting? The vote is represented in DT exactly as
described in the bindings. 

Jordan

> -- 
> viresh
> _______________________________________________
> Freedreno mailing list
> Freedreno at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/freedreno

-- 
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project