[Intel-gfx] [PATCH 3/3] drm/i915: Forcing a modeset when resetting HDMI link

[Ville Syrjälä]

On Fri, Mar 01, 2019 at 04:33:49PM -0800, José Roberto de Souza wrote:
> With fastboot enabled in gen9+ it broke the HDMI reset as just
> setting mode_changed to true causes a fastset and here we want a full
> modeset that will disable and then enable the encoder of this HDMI
> link actually, so setting connectors_changed instead that will cause
> modeset as desired.
> 
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>

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

The two other questionable places seem to be:

* intel_digital_connector_atomic_check()
  Looks like this is currently broken as we don't do infoframe/audio
  updates from the .update_pipe() hook yet. Also we have no
  .update_pipe() for pre-ddi platforms.

* intel_modeset_all_pipes()
  Should work because we set the flag after the modeset->fastset
  downgrade has occurred. Might make sense to change this one as
  well though, just to avoid copy paste errors in the future.

> ---
>  drivers/gpu/drm/i915/intel_ddi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index c22ddde2dfc1..d329f0c206ec 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -3973,7 +3973,7 @@ static int modeset_pipe(struct drm_crtc *crtc,
>  		goto out;
>  	}
>  
> -	crtc_state->mode_changed = true;
> +	crtc_state->connectors_changed = true;
>  
>  	ret = drm_atomic_commit(state);
>  out:
> -- 
> 2.21.0

-- 
Ville Syrjälä
Intel