linux-kernel - Re: [PATCH 2/3] arm64: dts: sc7180: add bus clock to mdp node for sc7180 target

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Date:   Tue, 4 Aug 2020 08:43:54 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Kalyan Thota <kalyan_t@...eaurora.org>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Krishna Manikandan <mkrishn@...eaurora.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sean Paul <seanpaul@...omium.org>,
        "Kristian H. Kristensen" <hoegsberg@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Jeykumar Sankaran <jsanka@...eaurora.org>,
        Raviteja Tamatam <travitej@...eaurora.org>,
        nganji@...eaurora.org
Subject: Re: [PATCH 2/3] arm64: dts: sc7180: add bus clock to mdp node for
 sc7180 target

On Thu, Jul 16, 2020 at 4:36 AM Kalyan Thota <kalyan_t@...eaurora.org> wrote:
>
> From: Krishna Manikandan <mkrishn@...eaurora.org>
>
> Move the bus clock to mdp device node,in order
> to facilitate bus band width scaling on sc7180
> target.
>
> The parent device MDSS will not vote for bus bw,
> instead the vote will be triggered by mdp device
> node. Since a minimum vote is required to turn
> on bus clock, move the clock node to mdp device
> from where the votes are requested.
>
> This patch has dependency on the below series
> https://patchwork.kernel.org/patch/11468783/
>
> Signed-off-by: Krishna Manikandan <mkrishn@...eaurora.org>

Reviewed-by: Rob Clark <robdclark@...omium.org>

> ---
>  arch/arm64/boot/dts/qcom/sc7180.dtsi | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> index 4f2c0d1..31fed6d 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> @@ -1510,10 +1510,9 @@
>                         power-domains = <&dispcc MDSS_GDSC>;
>
>                         clocks = <&gcc GCC_DISP_AHB_CLK>,
> -                                <&gcc GCC_DISP_HF_AXI_CLK>,
>                                  <&dispcc DISP_CC_MDSS_AHB_CLK>,
>                                  <&dispcc DISP_CC_MDSS_MDP_CLK>;
> -                       clock-names = "iface", "bus", "ahb", "core";
> +                       clock-names = "iface", "ahb", "core";
>
>                         assigned-clocks = <&dispcc DISP_CC_MDSS_MDP_CLK>;
>                         assigned-clock-rates = <300000000>;
> @@ -1539,12 +1538,13 @@
>                                       <0 0x0aeb0000 0 0x2008>;
>                                 reg-names = "mdp", "vbif";
>
> -                               clocks = <&dispcc DISP_CC_MDSS_AHB_CLK>,
> +                               clocks = <&gcc GCC_DISP_HF_AXI_CLK>,
> +                                        <&dispcc DISP_CC_MDSS_AHB_CLK>,
>                                          <&dispcc DISP_CC_MDSS_ROT_CLK>,
>                                          <&dispcc DISP_CC_MDSS_MDP_LUT_CLK>,
>                                          <&dispcc DISP_CC_MDSS_MDP_CLK>,
>                                          <&dispcc DISP_CC_MDSS_VSYNC_CLK>;
> -                               clock-names = "iface", "rot", "lut", "core",
> +                               clock-names = "bus", "iface", "rot", "lut", "core",
>                                               "vsync";
>                                 assigned-clocks = <&dispcc DISP_CC_MDSS_MDP_CLK>,
>                                                   <&dispcc DISP_CC_MDSS_VSYNC_CLK>;
> --
> 1.9.1
>