[Intel-gfx] [PATCH v2 2/4] drm/i915: Re-adjusting rc6 promotional timer for chv

[Paulo Zanoni]

2015-03-19 11:14 GMT-03:00  <deepak.s at linux.intel.com>:
> From: Deepak S <deepak.s at linux.intel.com>
>
> After feedback from the hardware team we are changing the RC6
> promotional timer to increase the power saving without
> changing performance.

I was told that my review comments were sent to the previous
submission of this patch. So just to document things, this is what I
wrote:

"I can't really say whether this is really what we want since I didn't
do any measurements, but the patch seems to do what it says, so:
Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>"

And Deepak replied that the measurements were done by the hardware team.

Since the patch is the same, the R-B tag still applies.

>
> Signed-off-by: Deepak S <deepak.s at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index e18f0fd..6d04147 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4980,8 +4980,8 @@ static void cherryview_enable_rps(struct drm_device *dev)
>                 I915_WRITE(RING_MAX_IDLE(ring->mmio_base), 10);
>         I915_WRITE(GEN6_RC_SLEEP, 0);
>
> -       /* TO threshold set to 1750 us ( 0x557 * 1.28 us) */
> -       I915_WRITE(GEN6_RC6_THRESHOLD, 0x557);
> +       /* TO threshold set to 500 us ( 0x186 * 1.28 us) */
> +       I915_WRITE(GEN6_RC6_THRESHOLD, 0x186);
>
>         /* allows RC6 residency counter to work */
>         I915_WRITE(VLV_COUNTER_CONTROL,
> --
> 1.9.1
>
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-- 
Paulo Zanoni