linux-kernel - Re: [PATCH v2 03/20] media: venus: pm_helpers: Add kerneldoc to venus_clks

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Date: Wed, 6 Mar 2024 12:20:04 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>,
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
 Vikash Garodia <quic_vgarodia@...cinc.com>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>, Andy Gross
 <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Philipp Zabel <p.zabel@...gutronix.de>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>,
 Stanimir Varbanov <stanimir.varbanov@...aro.org>,
 Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
 linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 03/20] media: venus: pm_helpers: Add kerneldoc to
 venus_clks_get()

On 09/02/2024 21:09, Konrad Dybcio wrote:
> To make it easier to understand the various clock requirements within
> this driver, add kerneldoc to venus_clk_get() explaining the fluff.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>   drivers/media/platform/qcom/venus/pm_helpers.c | 28 ++++++++++++++++++++++++++
>   1 file changed, 28 insertions(+)
> 
> diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
> index ac7c83404c6e..ea0a7d4601e2 100644
> --- a/drivers/media/platform/qcom/venus/pm_helpers.c
> +++ b/drivers/media/platform/qcom/venus/pm_helpers.c
> @@ -23,6 +23,34 @@
>   
>   static bool legacy_binding;
>   
> +/**
> + * venus_clks_get() - Get Venus clocks that are not bound to a vcodec

Get non-codec Venus clocks.

> + * @core: A pointer to the venus core resource
> + *
> + * The Venus block (depending on the generation) can be split into a couple
> + * of clock domains: one for "main logic" and one for each video core (0-2pcs).

(0-2pcs) is hard for me to decode => zero to two parts?

Why are we double quoting "main logic" feels a bit "Dr Evil"

Suggest hyphenating which would do the same thing:

'one clock for the core-logic||main-logic'

> + *
> + * MSM8916 (and possibly other HFIv1 users) only feature the "main logic"
> + * domain, so this function is the only kind if clk_get necessary there.
> + *
> + * MSM8996 (and other HFIv3 users) feature two video cores, with core0 being
> + * statically proclaimed a decoder and core1 an encoder, with both having
> + * their own clock domains.

"statically defined" not "statically proclaimed"

> + *
> + * SDM845 features two video cores, each one of which may or may not be
> + * subdivided into 2 enc/dec threads.

"into two encoder/decoder threads."


> + *
> + * Other SoCs either feature a single video core (with its own clock domain)
> + * or 1 video core and 1 CVP (Computer Vision Processor) core. In both cases
> + * we treat it the same (CVP only happens to live near-by Venus on the SoC).

One not 1

> + *
> + * Due to unfortunate developments in the past, we have to support bindings
> + * (MSM8996, SDM660, SDM845) that require specifying the clocks and
> + * power-domains associated with a video core domain in a bogus subnode,
> + * which means that additional fluff is necessary..

"We need to support legacy bindings"

"sub-node"

> + *
> + * Return: 0 on success, negative errno on failure.
> + */
>   static int venus_clks_get(struct venus_core *core)
>   {
>   	const struct venus_resources *res = core->res;
> 

With that fixed.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>