[Intel-gfx] [PATCH] drm/i915: Unlock PPS registers after GPU reset

[Ville Syrjälä]

On Wed, Sep 14, 2016 at 01:04:13PM +0300, Imre Deak wrote:
> Reapply the PPS register unlock workaround after GPU reset on platforms
> where the reset clobbers the display HW state. This at least gets rid of
> the related WARN during LVDS encoder enabling on PNV.
> 
> Fixes: ed6143b8f75 ("drm/i915/lvds: Restore initial HW state during encoder enabling")
> Reported-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Imre Deak <imre.deak at intel.com>

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

> ---
>  drivers/gpu/drm/i915/intel_display.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 48433e1..8bcffdd 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -3629,6 +3629,7 @@ void intel_finish_reset(struct drm_i915_private *dev_priv)
>  		intel_runtime_pm_disable_interrupts(dev_priv);
>  		intel_runtime_pm_enable_interrupts(dev_priv);
>  
> +		intel_pps_unlock_regs_wa(dev_priv);
>  		intel_modeset_init_hw(dev);
>  
>  		spin_lock_irq(&dev_priv->irq_lock);
> -- 
> 2.5.0

-- 
Ville Syrjälä
Intel OTC