linux-kernel - Re: [PATCH v2 4/5] media: qcom: camss: Move VFE power-domain specifics into vfe.c

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Message-ID: <d3faea2a-cc28-434c-ac10-3dd55561674f@linaro.org>
Date:   Tue, 31 Oct 2023 11:54:46 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        hverkuil-cisco@...all.nl, laurent.pinchart@...asonboard.com,
        rfoss@...nel.org, todor.too@...il.com, andersson@...nel.org,
        mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/5] media: qcom: camss: Move VFE power-domain
 specifics into vfe.c

On 26.10.2023 17:50, Bryan O'Donoghue wrote:
> Moving the location of the hooks to VFE power domains has several
> advantages.
> 
> 1. Separation of concerns and functional decomposition.
>    vfe.c should be responsible for and know best how manage
>    power-domains for a VFE, excising from camss.c follows this
>    principle.
> 
> 2. Embeddeding a pointer to genpd in struct camss_vfe{} meas that we can
>    dispense with a bunch of kmalloc array inside of camss.c.
> 
> 3. Splitting up titan top gdsc from vfe/ife gdsc provides a base for
>    breaking up magic indexes in dtsi.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
[...]


> +	/*
> +	 * If the number of power-domains is greather than the number of VFEs
greater

> +	 * then the additional power-domain is for the entire CAMSS block the
> +	 * 'top' power-domain.
> +	 */
> +	if (camss->genpd_num <= camss->res->vfe_num)
> +		return 0;
>  
Konrad