linux-kernel - Re: [PATCH v6 3/4] media: venus: Update to bitrate based clock scaling

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Date:   Mon, 29 Jul 2019 14:38:25 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Aniket Masule <amasule@...eaurora.org>, linux-media@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        vgarodia@...eaurora.org
Subject: Re: [PATCH v6 3/4] media: venus: Update to bitrate based clock
 scaling

Hi,

On 7/22/19 12:07 PM, Aniket Masule wrote:
> Introduced clock scaling using bitrate, preavious
> calculations consider only the cycles per mb.
> Also, clock scaling is now triggered before every
> buffer being queued to the device. This helps in
> deciding precise clock cycles required.
> 
> Signed-off-by: Aniket Masule <amasule@...eaurora.org>
> ---
>  drivers/media/platform/qcom/venus/helpers.c | 33 +++++++++++++++++++++++++----
>  1 file changed, 29 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
> index 2c976e4..edf403d 100644
> --- a/drivers/media/platform/qcom/venus/helpers.c
> +++ b/drivers/media/platform/qcom/venus/helpers.c
> @@ -399,17 +399,26 @@ static int scale_clocks(struct venus_inst *inst)
>  	return ret;
>  }
>  
> -static unsigned long calculate_vpp_freq(struct venus_inst *inst)
> +static unsigned long calculate_inst_freq(struct venus_inst *inst,
> +					 unsigned long filled_len)
>  {
> -	unsigned long vpp_freq = 0;
> +	unsigned long vpp_freq = 0, vsp_freq = 0;
> +	u64 fps = inst->fps;
>  	u32 mbs_per_sec;
>  
>  	mbs_per_sec = load_per_instance(inst);
>  	vpp_freq = mbs_per_sec * inst->clk_data.codec_freq_data->vpp_freq;
>  	/* 21 / 20 is overhead factor */
>  	vpp_freq += vpp_freq / 20;
> +	vsp_freq = mbs_per_sec * inst->clk_data.codec_freq_data->vsp_freq;
>  
> -	return vpp_freq;
> +	/* 10 / 7 is overhead factor */
> +	if (inst->session_type == VIDC_SESSION_TYPE_ENC)
> +		vsp_freq += (inst->controls.enc.bitrate * 10) / 7;
> +	else
> +		vsp_freq += ((fps * filled_len * 8) * 10) / 7;

load_per_instance() already taken into account fps, thus I think fps
should be excluded from calculation.

> +
> +	return max(vpp_freq, vsp_freq);
>  }
>  


-- 
regards,
Stan