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

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Message-ID: <dd436fa8-085b-1c97-26bd-4c1d54a5d612@linaro.org>
Date:   Mon, 29 Jul 2019 10:54:28 +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



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;
> +
> +	return max(vpp_freq, vsp_freq);
>  }
>  
>  static int scale_clocks_v4(struct venus_inst *inst)
> @@ -417,13 +426,27 @@ static int scale_clocks_v4(struct venus_inst *inst)
>  	struct venus_core *core = inst->core;
>  	const struct freq_tbl *table = core->res->freq_tbl;
>  	unsigned int num_rows = core->res->freq_tbl_size;
> +	struct v4l2_m2m_ctx *m2m_ctx = inst->m2m_ctx;
>  	struct clk *clk = core->clks[0];
>  	struct device *dev = core->dev;
>  	unsigned int i;
>  	unsigned long freq = 0, freq_core1 = 0, freq_core2 = 0;
> +	unsigned long filled_len = 0;
> +	struct venus_buffer *buf, *n;
> +	struct vb2_buffer *vb;
>  	int ret;
>  
> -	freq = calculate_vpp_freq(inst);
> +	mutex_lock(&inst->lock);

the lock is not needed and having it will produce a deadlock.

> +	v4l2_m2m_for_each_src_buf_safe(m2m_ctx, buf, n) {
> +		vb = &buf->vb.vb2_buf;
> +		filled_len = max(filled_len, vb2_get_plane_payload(vb, 0));
> +	}
> +	mutex_unlock(&inst->lock);
> +
> +	if (inst->session_type == VIDC_SESSION_TYPE_DEC && !filled_len)
> +		return 0;
> +
> +	freq = calculate_inst_freq(inst, filled_len);
>  
>  	if (freq > table[0].freq)
>  		dev_warn(dev, "HW is overloaded, needed: %lu max: %lu\n",
> @@ -1093,6 +1116,8 @@ void venus_helper_vb2_buf_queue(struct vb2_buffer *vb)
>  	if (ret)
>  		goto unlock;
>  
> +	load_scale_clocks(inst);
> +
>  	ret = session_process_buf(inst, vbuf);
>  	if (ret)
>  		return_buf_error(inst, vbuf);
> 

-- 
regards,
Stan