[Intel-gfx] [PATCH 1/1] drm/i915/bxt: Set time interval unit to 0.833us

[Imre Deak]

On pe, 2015-09-18 at 23:39 +0530, Sagar Arun Kamble wrote:
> From: Akash Goel <akash.goel at intel.com>
> 
> Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma at intel.com>
> Signed-off-by: Akash Goel <akash.goel at intel.com>
> Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 67bf205..6b1998c 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2802,8 +2802,11 @@ enum skl_disp_power_wells {
>  
>  #define INTERVAL_1_28_US(us)	(((us) * 100) >> 7)
>  #define INTERVAL_1_33_US(us)	(((us) * 3)   >> 2)
> +#define INTERVAL_0_833_US(us)	(((us) * 6) / 5)
>  #define GT_INTERVAL_FROM_US(dev_priv, us) (IS_GEN9(dev_priv) ? \
> -				INTERVAL_1_33_US(us) : \
> +				(IS_BROXTON(dev_priv) ? \
> +				INTERVAL_0_833_US(us) : \
> +				INTERVAL_1_33_US(us)) : \
>  				INTERVAL_1_28_US(us))

Note that neither of the GEN9 values are mentioned in Bspec, so a
request for update should be filed there. I haven't found any other
place that would document this either, could you point me to it?

--Imre