linux-kernel - Re: [PATCH 1/4] media: qcom: camss: Convert to per-VFE pointer for power-domain linkages

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Date:   Wed, 25 Oct 2023 11:16:25 +0200
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, agross@...nel.org,
        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 1/4] media: qcom: camss: Convert to per-VFE pointer for
 power-domain linkages



On 10/25/23 00:42, Bryan O'Donoghue wrote:
> Right now we use the top-level camss structure to provide pointers via
> VFE id index back to genpd linkages.
> 
> In effect this hard-codes VFE indexes to power-domain indexes in the
> dtsi and mandates a very particular ordering of power domains in the
> dtsi, which bears no relationship to a real hardware dependency.
> 
> As a first step to rationalising the VFE power-domain code and breaking
> the magic indexing in dtsi use per-VFE pointers to genpd linkages.
> 
> The top-level index in msm_vfe_subdev_init is still used to attain the
> initial so no functional or logical change arises from this change.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
[...]

> @@ -653,11 +653,11 @@ static int vfe_pm_domain_on(struct vfe_device *vfe)
>   	if (id >= camss->res->vfe_num)
>   		return 0;
>   
> -	camss->genpd_link[id] = device_link_add(camss->dev, camss->genpd[id],
> -						DL_FLAG_STATELESS |
> -						DL_FLAG_PM_RUNTIME |
> -						DL_FLAG_RPM_ACTIVE);
Good opportunity to inilne vfe->id and get rid of a local var!

> -	if (!camss->genpd_link[id])
> +	vfe->genpd_link = device_link_add(camss->dev, vfe->genpd,
> +					  DL_FLAG_STATELESS |
> +					  DL_FLAG_PM_RUNTIME |
> +					  DL_FLAG_RPM_ACTIVE);
> +	if (!vfe->genpd_link)
>   		return -EINVAL;
>   
[...]

>   /*
> @@ -1128,10 +1124,10 @@ static int vfe_pm_domain_on(struct vfe_device *vfe)
>   	struct camss *camss = vfe->camss;
>   	enum vfe_line_id id = vfe->id;
>   
> -	camss->genpd_link[id] = device_link_add(camss->dev, camss->genpd[id], DL_FLAG_STATELESS |
> -						DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
> +	vfe->genpd_link = device_link_add(camss->dev, vfe->genpd, DL_FLAG_STATELESS |
> +					  DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
>   
> -	if (!camss->genpd_link[id]) {
> +	if (!vfe->genpd_link) {
>   		dev_err(vfe->camss->dev, "Failed to add VFE#%d to power domain\n", id);
>   		return -EINVAL;
And here

[...]

> @@ -1113,10 +1111,10 @@ static int vfe_pm_domain_on(struct vfe_device *vfe)
>   	struct camss *camss = vfe->camss;
>   	enum vfe_line_id id = vfe->id;
>   
> -	camss->genpd_link[id] = device_link_add(camss->dev, camss->genpd[id], DL_FLAG_STATELESS |
> -						DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
> +	vfe->genpd_link = device_link_add(camss->dev, vfe->genpd, DL_FLAG_STATELESS |
> +					  DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
>   
> -	if (!camss->genpd_link[id]) {
> +	if (!vfe->genpd_link) {
>   		dev_err(vfe->camss->dev, "Failed to add VFE#%d to power domain\n", id);
>   		return -EINVAL;
And here

[...]
>   
>   /*
> @@ -478,11 +478,11 @@ static int vfe_pm_domain_on(struct vfe_device *vfe)
>   	if (id >= camss->res->vfe_num)
>   		return 0;
>   
> -	camss->genpd_link[id] = device_link_add(camss->dev, camss->genpd[id],
> -						DL_FLAG_STATELESS |
> -						DL_FLAG_PM_RUNTIME |
> -						DL_FLAG_RPM_ACTIVE);
> -	if (!camss->genpd_link[id])
> +	vfe->genpd_link = device_link_add(camss->dev, vfe->genpd,
> +					  DL_FLAG_STATELESS |
> +					  DL_FLAG_PM_RUNTIME |
> +					  DL_FLAG_RPM_ACTIVE);
And here


Konrad