linux-kernel - Re: [PATCH] clk: rockchip: rk3288: prefer vdpu for vcodec clock source

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Date:   Sun, 14 May 2017 17:06:19 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Randy Li <ayaka@...lik.info>
Cc:     linux-rockchip@...ts.infradead.org, mturquette@...libre.com,
        sboyd@...eaurora.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] clk: rockchip: rk3288: prefer vdpu for vcodec clock source

Hi Randy,

Am Sonntag, 14. Mai 2017, 14:50:09 CEST schrieb Randy Li:
> The RK3288 CRU system clock solution would suggest use
> the vdpu clock source for the VPU(aclk_vpu and hclk_vpu).
> 
> Reading the registers of VPU(both VEPU and VDPU) would become all high
> when the vepu is used as the clock source. It may be a bug in the SoC,
> not sure whether it is fixed at RK3288W.

I don't think that is a case of "preference". GRF_SOC_CON0[7] indicates
that value 0 means vepu gets selected as vcodec clock and value 1 means
vdpu gets selected as vcodec.

The array values below are supposed to match these values, so array
index 0 represents the clock for value 0 and so on. So this is really only
a description of the hardware clock layout.

If you want to actually switch the mux value, please assign the vcodec
clock an id and use the assigned-clocks mechanism in the devicetree.

Heiko