linux-kernel - Re: [Freedreno] [PATCH 1/5] dt-bindings: display/msm: Add reg bus interconnect

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Date:   Wed, 19 Apr 2023 13:05:26 -0700
From:   Jeykumar Sankaran <quic_jeykumar@...cinc.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Krishna Manikandan <quic_mkrishn@...cinc.com>
CC:     <devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        "Marijn Suijten" <marijn.suijten@...ainline.org>,
        <freedreno@...ts.freedesktop.org>
Subject: Re: [Freedreno] [PATCH 1/5] dt-bindings: display/msm: Add reg bus
 interconnect

Resending the question as the previous one was sent only to the 
freedreno list. Apologies for spamming!

On 4/17/2023 8:30 AM, Konrad Dybcio wrote:
> Apart from the already handled data bus (MAS_MDP_Pn<->DDR), there's
> another path that needs to be handled to ensure MDSS functions properly,
> namely the "reg bus", a.k.a the CPU-MDSS interconnect.
> 
> Gating that path may have a variety of effects.. from none to otherwise
> inexplicable DSI timeouts..
> 
> Describe it in bindings to allow for use in device trees.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>   Documentation/devicetree/bindings/display/msm/mdss-common.yaml | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/mdss-common.yaml b/Documentation/devicetree/bindings/display/msm/mdss-common.yaml
> index ccd7d6417523..9eb5b6d3e0b9 100644
> --- a/Documentation/devicetree/bindings/display/msm/mdss-common.yaml
> +++ b/Documentation/devicetree/bindings/display/msm/mdss-common.yaml
> @@ -72,6 +72,7 @@ properties:
>       items:
>         - const: mdp0-mem
>         - const: mdp1-mem
> +      - const: cpu-cfg
>   
If posted already, please point to the DTSI patch for this ICC path.
>     resets:
>       items:
>