linux-kernel - Re: [PATCH v3 03/19] media: venus: pm_helpers: Add kerneldoc to venus_clks

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Message-ID: <80c0ecb3-1157-1d7a-0829-c3b68b65f17f@quicinc.com>
Date: Fri, 5 Apr 2024 13:56:13 +0530
From: Dikshita Agarwal <quic_dikshita@...cinc.com>
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>,
        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 v3 03/19] media: venus: pm_helpers: Add kerneldoc to
 venus_clks_get()



On 3/27/2024 11:38 PM, 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.
> 
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> 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..cf91f50a33aa 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
> + * @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 (0-2 instances).
> + *
> + * 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 defined a decoder and core1 an encoder, with both having
> + * their own clock domains.
> + *
> + * SDM845 features two video cores, each one of which may or may not be
> + * subdivided into two encoder/decoder threads.
> + *
> + * Other SoCs either feature a single video core (with its own clock domain)
> + * or one video core and one CVP (Computer Vision Processor) core. In both cases
> + * we treat it the same way (CVP only happens to live near-by Venus on the SoC).
> + *
> + * Due to unfortunate developments in the past, we need to support legacy
why unfortunate? please re-phrase this.
> + * bindings (MSM8996, SDM660, SDM845) that require specifying the clocks and
> + * power-domains associated with a video core domain in a bogus sub-node,
> + * which means that additional fluff is necessary..
> + *
> + * Return: 0 on success, negative errno on failure.
> + */
>  static int venus_clks_get(struct venus_core *core)
>  {
>  	const struct venus_resources *res = core->res;
> 

Thanks,
Dikshita