Re: [PATCH 1/3] drm/i915: Macros to convert PM time interval values to microseconds

[Daniel Vetter <daniel@ffwll.ch>]

On Sat, Apr 23, 2016 at 12:05:44AM +0530, akash.goel@intel.com wrote:
> From: Akash Goel <akash.goel@intel.com>
> 
> Added a new GT_PM_INTERVAL_TO_US macro to perform the platform
> specific conversion of PM time interval values to microseconds unit.
> 
> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Akash Goel <akash.goel@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 9464ba3..eacd9ae 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2939,6 +2939,15 @@ enum skl_disp_power_wells {
>  				INTERVAL_1_33_US(us)) : \
>  				INTERVAL_1_28_US(us))
>  
> +#define INTERVAL_1_28_TO_US(interval)  (((interval) << 7) / 100)
> +#define INTERVAL_1_33_TO_US(interval)  (((interval) << 2) / 3)
> +#define INTERVAL_0_833_TO_US(interval) (((interval) * 5)  / 6)
> +#define GT_PM_INTERVAL_TO_US(dev_priv, interval) (IS_GEN9(dev_priv) ? \
> +                           (IS_BROXTON(dev_priv) ? \
> +                           INTERVAL_0_833_TO_US(interval) : \
> +                           INTERVAL_1_33_TO_US(interval)) : \
> +                           INTERVAL_1_28_TO_US(interval))

Bikeshed, but I think once we have platform logic in there a real inline
functino starts to look better.

Feel free to ignore since already pushed.
-Daniel

> +
>  /*
>   * Logical Context regs
>   */
> -- 
> 1.9.2
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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