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

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Message-ID: <932dad4ac3c585080dfb35c7577b4b3f@codeaurora.org>
Date:   Tue, 27 Aug 2019 10:25:30 +0530
From:   amasule@...eaurora.org
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>
Cc:     linux-media@...r.kernel.org, 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 Stan,

On 2019-07-29 17:08, Stanimir Varbanov wrote:
> 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.
> 
I will correct this, fps is needed for stream processor frequency 
calculations,
also fps is not needed for vpp.
>> +
>> +	return max(vpp_freq, vsp_freq);
>>  }
>> 

Regards,
Aniket