[Intel-gfx] [PATCH] drm/i915: Force RC6 restore after system resume and reset

[Mika Kuoppala]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> In order for the RC6 autoenable worker to take any action, RC6 first
> must be disabled. Upon resume or reset, the sw state may be stale and so
> we require a forced restore.
>
> Fixes: b7137e0cf1e5 ("drm/i915: Defer enabling rc6 til after we submit...")
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala at intel.com>
> Cc: Sagar Arun Kamble <sagar.a.kamble at intel.com>

Reading the code it stood out that we could get rid of sanitize
completely and always disable before calling autoenable gt powersave.

But lets not take too big steps,

Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>

> ---
>  drivers/gpu/drm/i915/i915_drv.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 5a7c0c2e57d8..fc9273215286 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1560,6 +1560,7 @@ static int i915_drm_resume(struct drm_device *dev)
>  	int ret;
>  
>  	disable_rpm_wakeref_asserts(dev_priv);
> +	intel_sanitize_gt_powersave(dev_priv);
>  
>  	ret = i915_ggtt_enable_hw(dev_priv);
>  	if (ret)
> @@ -1809,6 +1810,7 @@ int i915_reset(struct drm_i915_private *dev_priv)
>  	 * previous concerns that it doesn't respond well to some forms
>  	 * of re-init after reset.
>  	 */
> +	intel_sanitize_gt_powersave(dev_priv);
>  	intel_autoenable_gt_powersave(dev_priv);
>  
>  	return 0;
> -- 
> 2.9.3