Re: [PATCH 2/2] drm/i915: vlv: increase timeout when setting idle GPU freq

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

On Wed, Nov 19, 2014 at 04:25:38PM +0200, Imre Deak wrote:
> I saw punit timeouts in vlv_set_rps_idle() while running various
> subtests of pm_rpm. Increasing the timeout to 100ms got rid of the
> issue.
> 
> Testcase: igt/pm_rpm
> Reference: https://bugs.freedesktop.org/show_bug.cgi?id=82939
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 5cc0ebc..3a58797 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4451,7 +4451,7 @@ static void vlv_set_rps_idle(struct drm_i915_private *dev_priv)
>  					dev_priv->rps.min_freq_softlimit);
>  
>  	if (wait_for(((vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS))
> -				& GENFREQSTATUS) == 0, 5))
> +				& GENFREQSTATUS) == 0, 100))

If it takes a while then it takes a while. Nothing we can do about
that.

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

>  		DRM_ERROR("timed out waiting for Punit\n");
>  
>  	vlv_force_gfx_clock(dev_priv, false);
> -- 
> 1.8.4
> 
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-- 
Ville Syrjälä
Intel OTC
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