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

amasule
2019-08-27T04:55:33Z

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@codeaurora.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