Re: [PATCH v3 3/3] drm/i915: Add boot paramter to control rps boost at boot time.

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Sat, Mar 15, 2014 at 08:23:24PM +0530, deepak.s@linux.intel.com wrote:
> From: Deepak S <deepak.s@linux.intel.com>
> 
> We are adding a module paramter to control rps boost. By default, we
> enable the boost for better performace. Based on the need (perf/power)
> we can either enable/disable.
> 
> v2: Addressed rps default comment (Jani)
> 
> v3: Use bool to represent the boot parameter (Ville).
> 
> Signed-off-by: Deepak S <deepak.s@linux.intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> ---
>  drivers/gpu/drm/i915/i915_drv.h    | 1 +
>  drivers/gpu/drm/i915/i915_gem.c    | 2 +-
>  drivers/gpu/drm/i915/i915_params.c | 5 +++++
>  3 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index f23c258..6d91b1c 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2120,6 +2120,7 @@ struct i915_params {
>  	bool prefault_disable;
>  	bool reset;
>  	bool disable_display;
> +	bool enable_rps_boost;
>  };
>  extern struct i915_params i915 __read_mostly;
>  
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 92b0b41..b9c52b8 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -1042,7 +1042,7 @@ static int __wait_seqno(struct intel_ring_buffer *ring, u32 seqno,
>  
>  	timeout_expire = timeout ? jiffies + timespec_to_jiffies_timeout(timeout) : 0;
>  
> -	if (INTEL_INFO(dev)->gen >= 6 && can_wait_boost(file_priv)) {
> +	if (INTEL_INFO(dev)->gen >= 6 && can_wait_boost(file_priv) && i915.enable_rps_boost) {
>  		gen6_rps_boost(dev_priv);
>  		if (file_priv)
>  			mod_delayed_work(dev_priv->wq,
> diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
> index a66ffb6..772659f 100644
> --- a/drivers/gpu/drm/i915/i915_params.c
> +++ b/drivers/gpu/drm/i915/i915_params.c
> @@ -49,6 +49,7 @@ struct i915_params i915 __read_mostly = {
>  	.invert_brightness = 0,
>  	.disable_display = 0,
>  	.enable_cmd_parser = 0,
> +	.enable_rps_boost = true,
>  };
>  
>  module_param_named(modeset, i915.modeset, int, 0400);
> @@ -162,3 +163,7 @@ MODULE_PARM_DESC(disable_display, "Disable display (default: false)");
>  module_param_named(enable_cmd_parser, i915.enable_cmd_parser, int, 0600);
>  MODULE_PARM_DESC(enable_cmd_parser,
>  		 "Enable command parsing (1=enabled, 0=disabled [default])");
> +
> +module_param_named(enable_rps_boost, i915.enable_rps_boost, bool, 0600);
> +MODULE_PARM_DESC(enable_rps_boost,
> +		 "Enable/Disable boost RPS frequency (default: true)");
> -- 
> 1.8.4.2
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC