[Intel-gfx] [PATCH v2 3/7] drm/i915: Use down ei for manual Baytrail RPS calculations

[Daniel Vetter]

On Wed, Mar 18, 2015 at 09:48:23AM +0000, Chris Wilson wrote:
> Use both up/down manual ei calcuations for symmetry and greater
> flexibility for reclocking, instead of faking the down interrupt based
> on a fixed integer number of up interrupts.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Reviewed-by: Deepak S<deepak.s at linux.intel.com>

Merged up to this patch, thanks.
-Daniel

> ---
>  drivers/gpu/drm/i915/i915_drv.h |  2 --
>  drivers/gpu/drm/i915/i915_irq.c | 15 ++-------------
>  drivers/gpu/drm/i915/i915_reg.h |  1 -
>  drivers/gpu/drm/i915/intel_pm.c |  5 ++---
>  4 files changed, 4 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index a06536cfce6d..b156bc30c9c9 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1031,8 +1031,6 @@ struct intel_gen6_power_mgmt {
>  	u8 rp0_freq;		/* Non-overclocked max frequency. */
>  	u32 cz_freq;
>  
> -	u32 ei_interrupt_count;
> -
>  	int last_adj;
>  	enum { LOW_POWER, BETWEEN, HIGH_POWER } power;
>  
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 8d8d33d068dd..6d8340d5a111 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1033,7 +1033,6 @@ void gen6_rps_reset_ei(struct drm_i915_private *dev_priv)
>  {
>  	vlv_c0_read(dev_priv, &dev_priv->rps.down_ei);
>  	dev_priv->rps.up_ei = dev_priv->rps.down_ei;
> -	dev_priv->rps.ei_interrupt_count = 0;
>  }
>  
>  static u32 vlv_wa_c0_ei(struct drm_i915_private *dev_priv, u32 pm_iir)
> @@ -1041,23 +1040,13 @@ static u32 vlv_wa_c0_ei(struct drm_i915_private *dev_priv, u32 pm_iir)
>  	struct intel_rps_ei now;
>  	u32 events = 0;
>  
> -	if ((pm_iir & GEN6_PM_RP_UP_EI_EXPIRED) == 0)
> +	if ((pm_iir & (GEN6_PM_RP_DOWN_EI_EXPIRED | GEN6_PM_RP_UP_EI_EXPIRED)) == 0)
>  		return 0;
>  
>  	vlv_c0_read(dev_priv, &now);
>  	if (now.cz_clock == 0)
>  		return 0;
>  
> -	/*
> -	 * To down throttle, C0 residency should be less than down threshold
> -	 * for continous EI intervals. So calculate down EI counters
> -	 * once in VLV_INT_COUNT_FOR_DOWN_EI
> -	 */
> -	if (++dev_priv->rps.ei_interrupt_count >= VLV_INT_COUNT_FOR_DOWN_EI) {
> -		pm_iir |= GEN6_PM_RP_DOWN_EI_EXPIRED;
> -		dev_priv->rps.ei_interrupt_count = 0;
> -	}
> -
>  	if (pm_iir & GEN6_PM_RP_DOWN_EI_EXPIRED) {
>  		if (!vlv_c0_above(dev_priv,
>  				  &dev_priv->rps.down_ei, &now,
> @@ -4254,7 +4243,7 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
>  	/* Let's track the enabled rps events */
>  	if (IS_VALLEYVIEW(dev_priv) && !IS_CHERRYVIEW(dev_priv))
>  		/* WaGsvRC0ResidencyMethod:vlv */
> -		dev_priv->pm_rps_events = GEN6_PM_RP_UP_EI_EXPIRED;
> +		dev_priv->pm_rps_events = GEN6_PM_RP_DOWN_EI_EXPIRED | GEN6_PM_RP_UP_EI_EXPIRED;
>  	else
>  		dev_priv->pm_rps_events = GEN6_PM_RPS_EVENTS;
>  
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 2d76c566d843..5b84ee686f99 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -673,7 +673,6 @@ enum skl_disp_power_wells {
>  #define VLV_CZ_CLOCK_TO_MILLI_SEC		100000
>  #define VLV_RP_UP_EI_THRESHOLD			90
>  #define VLV_RP_DOWN_EI_THRESHOLD		70
> -#define VLV_INT_COUNT_FOR_DOWN_EI		5
>  
>  /* vlv2 north clock has */
>  #define CCK_FUSE_REG				0x8
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 68c9cc252d36..e18f0fd22cf2 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3922,11 +3922,10 @@ static u32 gen6_rps_pm_mask(struct drm_i915_private *dev_priv, u8 val)
>  	u32 mask = 0;
>  
>  	if (val > dev_priv->rps.min_freq_softlimit)
> -		mask |= GEN6_PM_RP_DOWN_THRESHOLD | GEN6_PM_RP_DOWN_TIMEOUT;
> +		mask |= GEN6_PM_RP_DOWN_EI_EXPIRED | GEN6_PM_RP_DOWN_THRESHOLD | GEN6_PM_RP_DOWN_TIMEOUT;
>  	if (val < dev_priv->rps.max_freq_softlimit)
> -		mask |= GEN6_PM_RP_UP_THRESHOLD;
> +		mask |= GEN6_PM_RP_UP_EI_EXPIRED | GEN6_PM_RP_UP_THRESHOLD;
>  
> -	mask |= dev_priv->pm_rps_events & (GEN6_PM_RP_DOWN_EI_EXPIRED | GEN6_PM_RP_UP_EI_EXPIRED);
>  	mask &= dev_priv->pm_rps_events;
>  
>  	return gen6_sanitize_rps_pm_mask(dev_priv, ~mask);
> -- 
> 2.1.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch