Re: [PATCH v2 2/2] drm/i915: fix VDD state tracking after system resume

[Daniel Vetter <daniel@ffwll.ch>]

On Wed, Jul 30, 2014 at 03:57:32PM +0300, Imre Deak wrote:
> Just like during booting the BIOS can leave the VDD bit enabled after
> system resume. So apply the same state sanitization there too. This
> fixes a problem where after resume the port power domain refcount gets
> unbalanced.
> 
> Reported-and-tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 1edfd1a..fdb5657 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -12977,6 +12977,12 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
>  	/* HW state is read out, now we need to sanitize this mess. */
>  	list_for_each_entry(encoder, &dev->mode_config.encoder_list,
>  			    base.head) {
> +		/*
> +		 * Do the following only during resume, since at driver
> +		 * loading it's done early when initializing the encoder.
> +		 */
> +		if (force_restore)
> +			intel_edp_panel_vdd_sanitize(encoder);

This should be put into an encoder->reset callback.
-Daniel

>  		intel_sanitize_encoder(encoder);
>  	}
>  
> -- 
> 1.8.4
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch