linux-kernel - Re: [PATCH 4/6] media: platform: venus: Add optional LLCC path

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Date:   Fri, 4 Aug 2023 22:04:15 +0100
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>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] media: platform: venus: Add optional LLCC path

On 04/08/2023 21:09, Konrad Dybcio wrote:
> Some newer SoCs (such as SM8350) have a third interconnect path. Add
> it and make it optional.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>   drivers/media/platform/qcom/venus/core.c       | 19 +++++++++++++++++++
>   drivers/media/platform/qcom/venus/core.h       |  3 +++
>   drivers/media/platform/qcom/venus/pm_helpers.c |  3 +++
>   3 files changed, 25 insertions(+)
> 
> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> index 0af45faec247..db363061748f 100644
> --- a/drivers/media/platform/qcom/venus/core.c
> +++ b/drivers/media/platform/qcom/venus/core.c
> @@ -302,6 +302,15 @@ static int venus_probe(struct platform_device *pdev)
>   	if (IS_ERR(core->cpucfg_path))
>   		return PTR_ERR(core->cpucfg_path);
>   
> +	core->llcc_path = devm_of_icc_get(dev, "video-llcc");
> +	if (IS_ERR(core->llcc_path)) {
> +		/* LLCC path is optional */
> +		if (PTR_ERR(core->llcc_path) == -ENODATA)
> +			core->llcc_path = NULL;
> +		else
> +			return PTR_ERR(core->llcc_path);
> +	}
> +
>   	core->irq = platform_get_irq(pdev, 0);
>   	if (core->irq < 0)
>   		return core->irq;
> @@ -479,12 +488,18 @@ static __maybe_unused int venus_runtime_suspend(struct device *dev)
>   	if (ret)
>   		goto err_cpucfg_path;
>   
> +	ret = icc_set_bw(core->llcc_path, 0, 0);
> +	if (ret)
> +		goto err_llcc_path;
> +
>   	ret = icc_set_bw(core->video_path, 0, 0);
>   	if (ret)
>   		goto err_video_path;
>   
>   	return ret;
>   
> +err_llcc_path:
> +	icc_set_bw(core->video_path, kbps_to_icc(20000), 0);
>   err_video_path:
>   	icc_set_bw(core->cpucfg_path, kbps_to_icc(1000), 0);
>   err_cpucfg_path:
> @@ -504,6 +519,10 @@ static __maybe_unused int venus_runtime_resume(struct device *dev)
>   	if (ret)
>   		return ret;
>   
> +	ret = icc_set_bw(core->llcc_path, kbps_to_icc(20000), 0);
> +	if (ret)
> +		return ret;
> +

I would scream if someone left me this comment but...

In probe we have

video_path =
cpu_cfgpath =

llc_path =

suspend

icc_set_bw(cpu_cfgpath,);
icc_set_bw(llc_path,);
icc_set_bw(video_path,);

resume
icc_set_bw(video_path,);
icc_set_bw(llc_path,);
icc_set_bw(cpu_cfgpath,);

it would be nice to have probe match the ordering ...

>   	ret = icc_set_bw(core->cpucfg_path, kbps_to_icc(1000), 0);
>   	if (ret)
>   		return ret;
> diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
> index 2999c24392f5..45ed1551c2db 100644
> --- a/drivers/media/platform/qcom/venus/core.h
> +++ b/drivers/media/platform/qcom/venus/core.h
> @@ -65,6 +65,7 @@ struct venus_resources {
>   	unsigned int bw_tbl_enc_size;
>   	const struct bw_tbl *bw_tbl_dec;
>   	unsigned int bw_tbl_dec_size;
> +	bool has_llcc_path;

Why do you need this bool, you can get for llc_path == NULL

---
bod