[Intel-gfx] [PATCH 1/2] drm/i915: Print ring min freq scaling

[Chris Wilson]

On Wed, Sep 25, 2013 at 04:35:32PM -0700, Ben Widawsky wrote:
> This allows us to keep track of the values being set if we want to tweak
> this code.
> 
> Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index d27eda6..31cf188 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3671,6 +3671,9 @@ void gen6_update_ring_freq(struct drm_device *dev)
>  			ring_freq = (gpu_freq * 5 + 3) / 4;
>  			ring_freq = max(min_ring_freq, ring_freq);
>  			/* leave ia_freq as the default, chosen by cpufreq */
> +
> +			DRM_DEBUG_DRIVER("Setup min ring frequency %dMHz for GT freq %dMHz\n",
> +					 ring_freq * 100, gpu_freq * 50);
>  		} else {
>  			/* On older processors, there is no separate ring
>  			 * clock domain, so in order to boost the bandwidth
> @@ -3684,6 +3687,9 @@ void gen6_update_ring_freq(struct drm_device *dev)
>  			else
>  				ia_freq = max_ia_freq - ((diff * scaling_factor) / 2);
>  			ia_freq = DIV_ROUND_CLOSEST(ia_freq, 100);
> +
> +			DRM_DEBUG_DRIVER("Setup min ring frequency %dMHz for GT freq %dMHz\n",
> +					 ia_freq * 100, gpu_freq * 50);

This is not a ring freq, but a cpu core freq.
Also would be wise to point out that this information is in
/sys/kernel/debug/dri/0/i915_ring_freq_table
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre