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Message-ID: <d62d65b8-da05-4dfb-bf38-1c102564a5a0@linaro.org>
Date: Fri, 27 Oct 2023 10:38:25 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...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 2/5] media: qcom: camss: Convert to per-VFE pointer for
power-domain linkages
On 27/10/2023 10:10, Bryan O'Donoghue wrote:
> power-domains = <VFE_0>,
> <VFE_1>,
> <TITAN_TOP>; // the controller pd
>
> vfe-set = <VFE_0>, // has its own PD vfe->id = 0
> <VFE_1>, // has its own PD vfe->id = 1
> <VFE_LITE_N>; // has no PD vfe->id = 2
>
> The basic problem this series fixes is magic indexing.
So be a little clearer; this would be an invalid declaration in dtsi
right now
power-domains = <TITAN_TOP>, // has to come last
<VFE_0>,
<VFE_1>; // the code would think this TOP
The TOP GDSC must come last.
Similarly this would an invalid declaration in our resource structure
vfe-set = <VFE_LITE_0>, //the code thinks this is a VFE
<VFE_LITE_1>, //the code thinks this is a VFE
<VFE_0>,
<VFE_1>; // and that this is VFE Lite
vfe_num = 2;
vfe-id = {0..3}
// don't hook a PD for VFE Lite
if (vfe->id >= camss->res->vfe_num)
return 0;
has_pd fixes checks like that. Eventually we will throw away has_pd when
legacy indexing is dropped - in which case if vfe->id has a res->pd_name
we hook it, if not, then not.
The order of declaration won't matter.
---
bod
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