[Intel-gfx] [PATCH v3] drm/i915: Debugfs disable RPS boost and idle

[Sun, Daisy]

"So can you not tracepoints to give EI results for up/down signals and 
filter out the noise? ", Do you mean I don't need the debugfs at all?
For developer, he/she is able to trace anything including the point of 
Turbo algorithm adjustment(+n/-n).
But as a black box, validation will not see the cause but only the result.

Boost / Idle function will set RP frequency to Max / Min, turbo 
algorithm will +n / -n depends on our implementation.
My intention is to block the disturbance of Boost /Idle, then the RPS 
frequency change can only cause bye Turbo algorithm.
- Daisy

On 5/5/2014 10:51 PM, Chris Wilson wrote:
> On Mon, May 05, 2014 at 02:50:27PM -0700, Daisy Sun wrote:
>> RP frequency request is affected by 2 modules: normal turbo
>> algorithm and RPS boost algorithm. By adding RPS boost algorithm
>> to the mix, the final frequency becomes relatively unpredictable.
>> Add a switch to enable/disable RPS boost functionality. When
>> disabled, RP frequency will follow the normal turbo algorithm only.
>>
>> Intention: when boost and idle are disabled, we have a clear vision
>> of turbo algorithm. It‘s very helpful to verify if the turbo
>> algorithm is working as expected.
>> Without debugfs hooks, the RPS boost or idle may kick in at
>> anytime and any circumstances.
> The algorithm is still not the same as you "intended". So can you not
> tracepoints to give EI results for up/down signals and filter out the
> noise?
> -Chris
>