[Intel-gfx] [PATCH] drm/i915: Update PSR on resume.

[Daniel Vetter]

On Tue, May 27, 2014 at 04:50:14PM -0700, Rodrigo Vivi wrote:
> Some registers set during setup might not be persistent after suspend/resume.
> This was causing bugs for some people that was unable to get PSR entry state
> after resume cycle.
> 
> v2: Adding some comments and better commit message explaining why this is needed.
> 
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
> ---
>  drivers/gpu/drm/i915/i915_suspend.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
> index 56785e8..1923708 100644
> --- a/drivers/gpu/drm/i915/i915_suspend.c
> +++ b/drivers/gpu/drm/i915/i915_suspend.c
> @@ -288,6 +288,12 @@ static void i915_restore_display(struct drm_device *dev)
>  		I915_WRITE(PP_CONTROL, dev_priv->regfile.savePP_CONTROL);
>  	}
>  
> +	/* Forcing a full init sequence after resume to make sure all
> +	* registers are properly set. Some might not be persistent after
> +	* suspend/resume cycle. */
> +	dev_priv->psr.setup_done = false;
> +	intel_edp_psr_update(dev);

No, crtc_enable should take care of this. There's more places (like after
runtime pm) where the hw has potentially lost all register contents, so
crtc_enabl is the right place for this.
-Daniel

> +
>  	/* only restore FBC info on the platform that supports FBC*/
>  	intel_disable_fbc(dev);
>  
> -- 
> 1.9.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch