linux-kernel - Re: [RESEND PATCH v2] arm64: dts: ti: k3-am69-sk: remove assigned-clock-parents for unused VP

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Date: Fri, 2 Feb 2024 10:46:32 +0530
From: Aradhya Bhatia <a-bhatia1@...com>
To: Jayesh Choudhary <j-choudhary@...com>, <tomi.valkeinen@...asonboard.com>,
        <nm@...com>, <vigneshr@...com>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kristo@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <rogerq@...nel.org>, <sabiya.d@...com>,
        <u-kumar1@...com>, <eballetbo@...hat.com>
Subject: Re: [RESEND PATCH v2] arm64: dts: ti: k3-am69-sk: remove
 assigned-clock-parents for unused VP



On 01-Feb-24 19:53, Jayesh Choudhary wrote:
> VP2 and VP3 are unused video ports and VP3 share the same parent
> clock as VP1 causing issue with pixel clock setting for HDMI (VP1).
> The current DM firmware does not support changing parent clock if it
> is shared by another component. It returns 0 for the determine_rate
> query before causing set_rate to set the clock at default maximum of
> 1.8GHz which is a lot more than the maximum frequency videoports can
> support (600MHz) causing SYNC LOST issues.
> So remove the parent clocks for unused VPs to avoid conflict.
> 
> Fixes: 6f8605fd7d11 ("arm64: dts: ti: k3-am69-sk: Add DP and HDMI support")
> Reported-by: Nishanth Menon <nm@...com>
> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

Reviewed-by: Aradhya Bhatia <a-bhatia1@...com>

Regards
Aradhya

> ---
> 
> v1: <https://lore.kernel.org/all/20231221113042.48492-1-j-choudhary@ti.com/>
> 
> Changelog v1->v2:
> - Updated commit message
> - Picked up Tomi's R-by from v1
> - Removed "Closes:" link since its invalid now
> 
> (NOTE: Sending again as forgot to put mailing list in cc earlier)
> 
>  arch/arm64/boot/dts/ti/k3-am69-sk.dts | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am69-sk.dts b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
> index 8da591579868..370980eb59b0 100644
> --- a/arch/arm64/boot/dts/ti/k3-am69-sk.dts
> +++ b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
> @@ -918,13 +918,9 @@ &dss {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&dss_vout0_pins_default>;
>  	assigned-clocks = <&k3_clks 218 2>,
> -			  <&k3_clks 218 5>,
> -			  <&k3_clks 218 14>,
> -			  <&k3_clks 218 18>;
> +			  <&k3_clks 218 5>;
>  	assigned-clock-parents = <&k3_clks 218 3>,
> -				 <&k3_clks 218 7>,
> -				 <&k3_clks 218 16>,
> -				 <&k3_clks 218 22>;
> +				 <&k3_clks 218 7>;
>  };
>  
>  &serdes_wiz4 {