linux-kernel - Re: [PATCH v5 1/5] arm64/dts/qcom/sc7280: remove assigned-clock-rate property for mdp clk

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Message-ID: <YizaGgCLxH0D9MRF@builder.lan>
Date:   Sat, 12 Mar 2022 11:36:26 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Vinod Polimera <quic_vpolimer@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        dianders@...omium.org, swboyd@...omium.org,
        quic_kalyant@...cinc.com
Subject: Re: [PATCH v5 1/5] arm64/dts/qcom/sc7280: remove assigned-clock-rate
 property for mdp clk

On Tue 08 Mar 10:54 CST 2022, Vinod Polimera wrote:

Please run:

  git log --oneline --no-decorate -- arch/arm64/boot/dts/qcom/sc7280.dtsi

and make sure your $subject is prefixed according to all other
sc7280-specific changes.

> Kernel clock driver assumes that initial rate is the
> max rate for that clock and was not allowing it to scale
> beyond the assigned clock value.
> 
> Drop the assigned clock rate property and vote on the mdp clock as per
> calculated value during the usecase.
> 
> Changes in v2:
> - Remove assigned-clock-rate property and set mdp clk during resume sequence.
> - Add fixes tag.
> 
> Changes in v3:
> - Remove extra line after fixes tag.(Stephen Boyd)

It's only in drivers/drm that the changelog goes in the commit message,
so please move this below the ---.

Thanks,
Bjorn

> 
> Fixes: 62fbdce91("arm64: dts: qcom: sc7280: add display dt nodes")
> Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index baf1653..408cf6c 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -2856,9 +2856,6 @@
>  				      "ahb",
>  				      "core";
>  
> -			assigned-clocks = <&dispcc DISP_CC_MDSS_MDP_CLK>;
> -			assigned-clock-rates = <300000000>;
> -
>  			interrupts = <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>;
>  			interrupt-controller;
>  			#interrupt-cells = <1>;
> @@ -2892,11 +2889,9 @@
>  					      "lut",
>  					      "core",
>  					      "vsync";
> -				assigned-clocks = <&dispcc DISP_CC_MDSS_MDP_CLK>,
> -						<&dispcc DISP_CC_MDSS_VSYNC_CLK>,
> +				assigned-clocks = <&dispcc DISP_CC_MDSS_VSYNC_CLK>,
>  						<&dispcc DISP_CC_MDSS_AHB_CLK>;
> -				assigned-clock-rates = <300000000>,
> -							<19200000>,
> +				assigned-clock-rates = <19200000>,
>  							<19200000>;
>  				operating-points-v2 = <&mdp_opp_table>;
>  				power-domains = <&rpmhpd SC7280_CX>;
> -- 
> 2.7.4
>