Re: [PATCH v3 1/5] drm/i915/chv: Remove Wait for a previous gfx force-off

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

On Sat, Mar 28, 2015 at 03:23:34PM +0530, deepak.s@linux.intel.com wrote:
> From: Deepak S <deepak.s@linux.intel.com>
> 
> On CHV, PUNIT team confirmed that 'VLV_GFX_CLK_STATUS_BIT' is not a
> sticky bit and it will always be set. So ignore Check for previous
> Gfx force off during suspend and allow the force clk as part S0ix
> Sequence
> 
> Signed-off-by: Deepak S <deepak.s@linux.intel.com>

Yeah seems OK. We still do the "allow wake" dance even though we skip
the gunit register save, so I guess the force gfx clock makes sense as
part of that.

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

> ---
>  drivers/gpu/drm/i915/i915_drv.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 82f8be4..182d6a7 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1194,11 +1194,13 @@ int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool force_on)
>  	int err;
>  
>  	val = I915_READ(VLV_GTLC_SURVIVABILITY_REG);
> -	WARN_ON(!!(val & VLV_GFX_CLK_FORCE_ON_BIT) == force_on);
>  
>  #define COND (I915_READ(VLV_GTLC_SURVIVABILITY_REG) & VLV_GFX_CLK_STATUS_BIT)
>  	/* Wait for a previous force-off to settle */
> -	if (force_on) {
> +	if (force_on && !IS_CHERRYVIEW(dev_priv->dev)) {
> +		/* WARN_ON only for the Valleyview */
> +		WARN_ON(!!(val & VLV_GFX_CLK_FORCE_ON_BIT) == force_on);
> +
>  		err = wait_for(!COND, 20);
>  		if (err) {
>  			DRM_ERROR("timeout waiting for GFX clock force-off (%08x)\n",
> -- 
> 1.9.1

-- 
Ville Syrjälä
Intel OTC
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