[Intel-gfx] [PATCH v2] drm/i915: Drop WA to fix Voltage not getting dropped to Vmin when Gfx is power gated for latest VLV revision

[Jani Nikula]

On Sat, 28 Jun 2014, deepak.s at linux.intel.com wrote:
> From: Deepak S <deepak.s at linux.intel.com>
>
> Workaround fixed in Latest VLV revision. Forcing Gfx clk up not needed, and Requesting the
> min freq should bring bring the voltage Vnn.
>
> v2: Drop WA for Latest VLV revision (Ville)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75244

> Signed-off-by: Deepak S <deepak.s at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index a90fdbd..6b6cfd4 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3212,6 +3212,14 @@ void gen6_set_rps(struct drm_device *dev, u8 val)
>  */
>  static void vlv_set_rps_idle(struct drm_i915_private *dev_priv)
>  {
> +	struct drm_device *dev = dev_priv->dev;
> +
> +	/* Latest VLV doesn't need Vnn WA*/
> +	if (dev->pdev->revision >= 0xd) {
> +		valleyview_set_rps(dev_priv->dev, dev_priv->rps.min_freq_softlimit);
> +		return;
> +	}
> +
>  	/*
>  	 * When we are idle.  Drop to min voltage state.
>  	 */
> -- 
> 1.9.1
>
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-- 
Jani Nikula, Intel Open Source Technology Center