Re: [PATCH V2] drm/i915: force full modeset if the connector is in DPMS OFF mode

[Jesse Barnes <jbarnes@virtuousgeek.org>]

On Fri,  3 May 2013 19:44:07 +0200
Egbert Eich <eich@suse.de> wrote:

> From: Imre Deak <imre.deak@intel.com>
> 
> Currently the driver's assumed behavior for a modeset with an attached
> FB is that the corresponding connector will be switched to DPMS ON mode
> if it happened to be in DPMS OFF (or another power save mode). This
> wasn't enforced though if only the FB changed, everything else (format,
> connector etc.) remaining the same. In this case we only set the new FB
> base and left the connector in the old power save mode.
> 
> Fix this by forcing a full modeset whenever there is an attached FB and
> any affected connector is in a power save mode.
> 
> V_2: Run the test for encoders in power save mode outside the the
> test for fb change: user space may have just disabled the encoders
> but left everything else in place. Make sure the connector list is
> not empty before running this test.
> 
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> Signed-off-by: Egbert Eich <eich@suse.de>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 24 ++++++++++++++++++++++--
>  1 file changed, 22 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 2939524..992d469 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -8380,6 +8380,21 @@ static void intel_set_config_restore_state(struct drm_device *dev,
>  	}
>  }
>  
> +static bool
> +connector_off(struct drm_crtc *crtc, struct drm_connector *connectors,
> +	      int num_connectors)
> +{
> +	int i;
> +
> +	for (i = 0; i < num_connectors; i++)
> +		if (connectors[i].encoder &&
> +		    connectors[i].encoder->crtc == crtc &&
> +		    connectors[i].dpms != DRM_MODE_DPMS_ON)
> +			return true;
> +
> +	return false;
> +}
> +
>  static void
>  intel_set_config_compute_mode_changes(struct drm_mode_set *set,
>  				      struct intel_set_config *config)
> @@ -8387,7 +8402,11 @@ intel_set_config_compute_mode_changes(struct drm_mode_set *set,
>  
>  	/* We should be able to check here if the fb has the same properties
>  	 * and then just flip_or_move it */
> -	if (set->crtc->fb != set->fb) {
> +	if (set->connectors != NULL && 
> +	    connector_off(set->crtc, *set->connectors,
> +			  set->num_connectors)) {
> +			config->mode_changed = true;
> +	} else if (set->crtc->fb != set->fb) {
>  		/* If we have no fb then treat it as a full mode set */
>  		if (set->crtc->fb == NULL) {
>  			DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
> @@ -8397,8 +8416,9 @@ intel_set_config_compute_mode_changes(struct drm_mode_set *set,
>  		} else if (set->fb->pixel_format !=
>  			   set->crtc->fb->pixel_format) {
>  			config->mode_changed = true;
> -		} else
> +		} else {
>  			config->fb_changed = true;
> +		}
>  	}
>  
>  	if (set->fb && (set->x != set->crtc->x || set->y != set->crtc->y))

Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>

-- 
Jesse Barnes, Intel Open Source Technology Center